Expand support to arrays to Native type extensions#1069

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copybara-service merged 1 commit into from
Jun 9, 2026
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Expand support to arrays to Native type extensions #1069

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1 change: 1 addition & 0 deletions extensions/src/main/java/dev/cel/extensions/BUILD.bazel
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -329,6 +329,7 @@ java_library(
deps = [
"//checker:checker_builder",
"//common/exceptions:attribute_not_found",
"//common/exceptions:invalid_argument",
"//common/internal:reflection_util",
"//common/types",
"//common/types:type_providers",
Expand Down
70 changes: 66 additions & 4 deletions extensions/src/main/java/dev/cel/extensions/CelNativeTypesExtensions.java
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Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -28,6 +28,7 @@
import com.google.errorprone.annotations.Immutable;
import dev.cel.checker.CelCheckerBuilder;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.internal.ReflectionUtil;
import dev.cel.common.types.CelType;
import dev.cel.common.types.CelTypeProvider;
Expand All@@ -47,6 +48,7 @@
import dev.cel.runtime.CelRuntimeLibrary;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
Expand DownExpand Up@@ -289,6 +291,15 @@ private static CelType mapJavaTypeToCelType(
return celType;
}

if (type.isArray()) {
TypeToken<?> token = TypeToken.of(genericType);
TypeToken<?> componentToken =
Preconditions.checkNotNull(
token.getComponentType(), "Array component type cannot be null");
return ListType.create(
mapJavaTypeToCelType(componentToken.getRawType(), componentToken.getType(), classMap));
}

if (type.isInterface()
&& !List.class.isAssignableFrom(type)
&& !Map.class.isAssignableFrom(type)) {
Expand DownExpand Up@@ -416,6 +427,14 @@ private void discover(Type type) {
TypeToken<?> token = TypeToken.of(type);
Class<?> rawType = token.getRawType();

if (rawType.isArray()) {
TypeToken<?> componentToken =
Preconditions.checkNotNull(
token.getComponentType(), "Array component type cannot be null");
discover(componentToken.getType());
return;
}

if (List.class.isAssignableFrom(rawType)) {
discover(ReflectionUtil.resolveGenericParameter(token, List.class, 0));
return;
Expand DownExpand Up@@ -775,6 +794,9 @@ private static Object getDefaultValue(Class<?> targetType) {
if (Map.class.isAssignableFrom(targetType)) {
return ImmutableMap.of();
}
if (targetType.isArray()) {
return Array.newInstance(targetType.getComponentType(), 0);
}

try {
Constructor<?> constructor = targetType.getDeclaredConstructor();
Expand DownExpand Up@@ -822,6 +844,10 @@ public Object toRuntimeValue(Object value) {
return new PojoStructValue(value, accessors, registry.classToTypeMap.get(clazz));
}

if (clazz.isArray() && clazz != byte[].class) {
return convertArrayToList(value);
}

return super.toRuntimeValue(value);
}

Expand All@@ -844,8 +870,14 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {
return ((CelByteString) value).toByteArray();
}

if (List.class.isAssignableFrom(targetType) && value instanceof List) {
return convertListToNative((List<?>) value, targetType, genericType);
if (value instanceof List) {
List<?> listValue = (List<?>) value;
if (List.class.isAssignableFrom(targetType)) {
return convertListToNative(listValue, targetType, genericType);
}
if (targetType.isArray()) {
return convertListToArray(listValue, targetType, genericType);
}
}

if (Map.class.isAssignableFrom(targetType) && value instanceof Map) {
Expand All@@ -857,7 +889,7 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {

// Safe reflection collection cast.
@SuppressWarnings("unchecked")
private Object convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
private List<?> convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
TypeToken<?> token = TypeToken.of(genericType);
Type elementType = ReflectionUtil.resolveGenericParameter(token, List.class, 0);
Class<?> componentType = ReflectionUtil.getRawType(elementType);
Expand DownExpand Up@@ -909,7 +941,7 @@ private Object convertListToNative(List<?> list, Class<?> targetType, Type gener

// Safe reflection collection cast.
@SuppressWarnings("unchecked")
private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
private Map<?, ?> convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
TypeToken<?> token = TypeToken.of(genericType);
Type keyType = ReflectionUtil.resolveGenericParameter(token, Map.class, 0);
Type valueType = ReflectionUtil.resolveGenericParameter(token, Map.class, 1);
Expand DownExpand Up@@ -970,6 +1002,36 @@ private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type gener
return builder.buildOrThrow();
}

private Object convertListToArray(List<?> list, Class<?> targetType, Type genericType) {
Class<?> componentType = targetType.getComponentType();
Object array = Array.newInstance(componentType, list.size());
TypeToken<?> token = TypeToken.of(genericType);
TypeToken<?> componentToken =
Preconditions.checkNotNull(
token.getComponentType(), "Array component type cannot be null");
Type componentGenericType = componentToken.getType();

for (int i = 0; i < list.size(); i++) {
Object element = list.get(i);
Object converted = toNative(element, componentType, componentGenericType);
Array.set(array, i, converted);
}
return array;
}

private ImmutableList<Object> convertArrayToList(Object array) {
int length = Array.getLength(array);
ImmutableList.Builder<Object> builder = ImmutableList.builderWithExpectedSize(length);
for (int i = 0; i < length; i++) {
Object element = Array.get(array, i);
if (element == null) {
throw new CelInvalidArgumentException(String.format("Element at index %d is null.", i));
}
builder.add(toRuntimeValue(element));
}
return builder.build();
}

private Object downcastPrimitives(Object value, Class<?> targetType) {
Class<?> wrappedTargetType = Primitives.wrap(targetType);
if (wrappedTargetType == Integer.class && value instanceof Long) {
Expand Down
4 changes: 2 additions & 2 deletions extensions/src/main/java/dev/cel/extensions/README.md
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -1114,14 +1114,14 @@ The type-mapping between Java and CEL is as follows:
| `String` | `string` |
| `java.time.Duration` | `duration` |
| `java.time.Instant` | `timestamp` |
| `java.util.List` | `list` |
| `java.util.List`, `T[]` (except `byte[]`) | `list` |
| `java.util.Map` | `map` |
| `java.util.Optional` | `optional_type` |

### Notes

* This is only supported for the planner runtime (e.g., `CelRuntimeFactory.plannerRuntimeBuilder()`).
* Native Java arrays (except `byte[]`) are not supported. Use `java.util.List` instead.
* Native Java arrays are supported. `byte[]` maps to `bytes`, while other arrays map to `list`.
* Java `enum` properties are not currently supported and will be safely ignored during scanning.
* If there is a name collision with a Protobuf type, the protobuf type will take precedence.
* Instantiating new struct values (e.g., `Account{id: 1234}`) requires the class to have a no-argument constructor (public, protected, package-private, or private).
Expand Down
1 change: 1 addition & 0 deletions extensions/src/test/java/dev/cel/extensions/BUILD.bazel
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -20,6 +20,7 @@ java_library(
"//common/exceptions:attribute_not_found",
"//common/exceptions:divide_by_zero",
"//common/exceptions:index_out_of_bounds",
"//common/exceptions:invalid_argument",
"//common/types",
"//common/types:type_providers",
"//common/values",
Expand Down
121 changes: 104 additions & 17 deletions extensions/src/test/java/dev/cel/extensions/CelNativeTypesExtensionsTest.java
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,7 @@
import dev.cel.common.CelContainer;
import dev.cel.common.CelValidationException;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.types.CelType;
import dev.cel.common.types.ListType;
import dev.cel.common.types.MapType;
Expand DownExpand Up@@ -90,7 +91,8 @@ public final class CelNativeTypesExtensionsTest {
TestGetterFieldTypeMismatchPojo.class,
TestAbstractPojo.class,
TestURLPojo.class,
PojoWithEnum.class);
PojoWithEnum.class,
TestArrayPojo.class);

private static final Cel CEL =
CelFactory.plannerCelBuilder()
Expand DownExpand Up@@ -323,10 +325,10 @@ public void nativeTypes_anonymousClass_throwsException() {

@Test
public void nativeTypes_createStruct_privateConstructor() throws Exception {
Object result = eval("TestPrivateConstructorPojo{value:" + " 'hello'}");
TestPrivateConstructorPojo result =
(TestPrivateConstructorPojo) eval("TestPrivateConstructorPojo{value:" + " 'hello'}");

assertThat(result).isInstanceOf(TestPrivateConstructorPojo.class);
assertThat(((TestPrivateConstructorPojo) result).value).isEqualTo("hello");
assertThat(result.value).isEqualTo("hello");
}

@Test
Expand DownExpand Up@@ -375,10 +377,9 @@ public void nativeTypes_missingNoArgConstructor_throws() throws Exception {

@Test
public void nativeTypes_createWithDeepConversion() throws Exception {
Object result = eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");

assertThat(result).isInstanceOf(TestDeepConversionPojo.class);
TestDeepConversionPojo pojo = (TestDeepConversionPojo) result;
TestDeepConversionPojo pojo =
(TestDeepConversionPojo)
eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");
assertThat(pojo.ints.get(0)).isEqualTo(1);
assertThat(pojo.floats).containsEntry("a", 1.0f);
}
Expand All@@ -398,11 +399,92 @@ public void nativeTypes_unsupportedTypeSet_throwsOnRegistration() throws Excepti
}

@Test
public void nativeTypes_arrayType_throwsOnRegistration() throws Exception {
IllegalArgumentException e =
public void nativeTypes_arrayType_construction() throws Exception {
String expr =
"TestArrayPojo{"
+ " strings: ['a', 'b'],"
+ " ints: [1, 2],"
+ " nesteds: [TestNestedType{value: 'nested'}],"
+ " matrix: [[1, 2], [3, 4]],"
+ " nestedMatrix: [[TestNestedType{value: 'm1'}], [TestNestedType{value: 'm2'}]],"
+ " byteArrays: [b'foo', b'bar']"
+ "}";

TestArrayPojo pojo = (TestArrayPojo) eval(expr);

assertThat(pojo.strings).isEqualTo(new String[] {"a", "b"});
assertThat(pojo.ints).isEqualTo(new int[] {1, 2});
assertThat(pojo.nesteds).hasLength(1);
assertThat(pojo.nesteds[0].value).isEqualTo("nested");
assertThat(pojo.matrix).hasLength(2);
assertThat(pojo.matrix[0]).isEqualTo(new int[] {1, 2});
assertThat(pojo.matrix[1]).isEqualTo(new int[] {3, 4});
assertThat(pojo.nestedMatrix).hasLength(2);
assertThat(pojo.nestedMatrix[0][0].value).isEqualTo("m1");
assertThat(pojo.nestedMatrix[1][0].value).isEqualTo("m2");
assertThat(pojo.byteArrays).hasLength(2);
assertThat(pojo.byteArrays[0]).isEqualTo("foo".getBytes(UTF_8));
assertThat(pojo.byteArrays[1]).isEqualTo("bar".getBytes(UTF_8));
}

@Test
public void nativeTypes_arrayType_selection() throws Exception {
CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
Cel cel =
CelFactory.plannerCelBuilder()
.setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
.addCompilerLibraries(extensions)
.addRuntimeLibraries(extensions)
.addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
.build();
String expr =
"pojo.strings[1] == 'b'"
+ " && pojo.ints[0] == 1"
+ " && pojo.nesteds[0].value == 'nested'"
+ " && pojo.matrix[1][0] == 3"
+ " && pojo.nestedMatrix[1][0].value == 'm2'"
+ " && pojo.byteArrays[1] == b'bar'";
CelAbstractSyntaxTree ast = cel.compile(expr).getAst();
CelRuntime.Program program = cel.createProgram(ast);

TestArrayPojo input = new TestArrayPojo();
input.strings = new String[] {"a", "b"};
input.ints = new int[] {1, 2};
TestNestedType nested = new TestNestedType();
nested.value = "nested";
input.nesteds = new TestNestedType[] {nested};
input.matrix = new int[][] {{1, 2}, {3, 4}};
TestNestedType m1 = new TestNestedType();
m1.value = "m1";
TestNestedType m2 = new TestNestedType();
m2.value = "m2";
input.nestedMatrix = new TestNestedType[][] {{m1}, {m2}};
input.byteArrays = new byte[][] {"foo".getBytes(UTF_8), "bar".getBytes(UTF_8)};

assertThat(program.eval(ImmutableMap.of("pojo", input))).isEqualTo(true);
}

@Test
public void nativeTypes_arrayWithNullElement_throws() throws Exception {
CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
Cel cel =
CelFactory.plannerCelBuilder()
.setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
.addCompilerLibraries(extensions)
.addRuntimeLibraries(extensions)
.addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
.build();
CelAbstractSyntaxTree ast = cel.compile("pojo.strings").getAst();
CelRuntime.Program program = cel.createProgram(ast);

TestArrayPojo input = new TestArrayPojo();
input.strings = new String[] {"a", null, "c"};

CelEvaluationException e =
assertThrows(
IllegalArgumentException.class, () -> CelExtensions.nativeTypes(TestArrayPojo.class));
assertThat(e).hasMessageThat().contains("Unsupported type for property 'values'");
CelEvaluationException.class, () -> program.eval(ImmutableMap.of("pojo", input)));
assertThat(e).hasCauseThat().isInstanceOf(CelInvalidArgumentException.class);
assertThat(e).hasCauseThat().hasMessageThat().contains("Element at index 1 is null.");
}

@Test
Expand DownExpand Up@@ -662,10 +744,7 @@ public void nativeTypes_createWithUint_fromUnsignedLong() throws Exception {
.getAst();
CelRuntime.Program program = celRuntime.createProgram(ast);

Object result = program.eval();

assertThat(result).isInstanceOf(TestAllTypesPublicFieldsPojo.class);
TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) result;
TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) program.eval();
assertThat(pojo.uintVal).isEqualTo(UnsignedLong.fromLongBits(42L));
}

Expand DownExpand Up@@ -782,6 +861,8 @@ public void nativeTypes_nullSafeTraversal() throws Exception {
assertThat(cel.createProgram(cel.compile("pojo.int64Val").getAst()).eval(vars)).isEqualTo(0L);
assertThat(cel.createProgram(cel.compile("pojo.nestedVal.value").getAst()).eval(vars))
.isEqualTo("");
assertThat(cel.createProgram(cel.compile("size(pojo.arrayVal) == 0").getAst()).eval(vars))
.isEqualTo(true);
CelAbstractSyntaxTree abstractPojoAst = cel.compile("pojo.abstractPojo.value").getAst();
CelRuntime.Program abstractPojoProgram = cel.createProgram(abstractPojoAst);
CelEvaluationException e =
Expand DownExpand Up@@ -942,6 +1023,7 @@ public String get() {
public double doubleVal;
public float floatVal;
public byte[] bytesVal;
public String[] arrayVal;
public Duration durationVal;
public Instant timestampVal;
public TestNestedType nestedVal;
Expand DownExpand Up@@ -1259,7 +1341,12 @@ public static class TestWildcardPojo {
}

public static class TestArrayPojo {
public String[] values;
public String[] strings;
public int[] ints;
public TestNestedType[] nesteds;
public int[][] matrix;
public TestNestedType[][] nestedMatrix;
public byte[][] byteArrays;
}

public static class TestOptionalUrlPojo {
Expand Down
Loading
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Expand support to arrays to Native type extensions#1069

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 Merged

copybara-service
merged 1 commit into

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Jun 9, 2026
 Merged


Expand support to arrays to Native type extensions
#1069
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1 change: 1 addition & 0 deletions
extensions/src/main/java/dev/cel/extensions/BUILD.bazel

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -329,6 +329,7 @@ java_library(
 deps = [
 "//checker:checker_builder",
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:invalid_argument",
 "//common/internal:reflection_util",
 "//common/types",
 "//common/types:type_providers",
Expand Down

70 changes: 66 additions & 4 deletions
extensions/src/main/java/dev/cel/extensions/CelNativeTypesExtensions.java

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -28,6 +28,7 @@
import com.google.errorprone.annotations.Immutable;
import dev.cel.checker.CelCheckerBuilder;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.internal.ReflectionUtil;
import dev.cel.common.types.CelType;
import dev.cel.common.types.CelTypeProvider;
Expand All@@ -47,6 +48,7 @@
import dev.cel.runtime.CelRuntimeLibrary;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
Expand DownExpand Up@@ -289,6 +291,15 @@ private static CelType mapJavaTypeToCelType(
 return celType;
 }

 if (type.isArray()) {
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 return ListType.create(
 mapJavaTypeToCelType(componentToken.getRawType(), componentToken.getType(), classMap));
 }

 if (type.isInterface()
 && !List.class.isAssignableFrom(type)
 && !Map.class.isAssignableFrom(type)) {
Expand DownExpand Up@@ -416,6 +427,14 @@ private void discover(Type type) {
 TypeToken<?> token = TypeToken.of(type);
 Class<?> rawType = token.getRawType();

 if (rawType.isArray()) {
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 discover(componentToken.getType());
 return;
 }

 if (List.class.isAssignableFrom(rawType)) {
 discover(ReflectionUtil.resolveGenericParameter(token, List.class, 0));
 return;
Expand DownExpand Up@@ -775,6 +794,9 @@ private static Object getDefaultValue(Class<?> targetType) {
 if (Map.class.isAssignableFrom(targetType)) {
 return ImmutableMap.of();
 }
 if (targetType.isArray()) {
 return Array.newInstance(targetType.getComponentType(), 0);
 }

 try {
 Constructor<?> constructor = targetType.getDeclaredConstructor();
Expand DownExpand Up@@ -822,6 +844,10 @@ public Object toRuntimeValue(Object value) {
 return new PojoStructValue(value, accessors, registry.classToTypeMap.get(clazz));
 }

 if (clazz.isArray() && clazz != byte[].class) {
 return convertArrayToList(value);
 }

 return super.toRuntimeValue(value);
 }

Expand All@@ -844,8 +870,14 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {
 return ((CelByteString) value).toByteArray();
 }

 if (List.class.isAssignableFrom(targetType) && value instanceof List) {
 return convertListToNative((List<?>) value, targetType, genericType);
 if (value instanceof List) {
 List<?> listValue = (List<?>) value;
 if (List.class.isAssignableFrom(targetType)) {
 return convertListToNative(listValue, targetType, genericType);
 }
 if (targetType.isArray()) {
 return convertListToArray(listValue, targetType, genericType);
 }
 }

 if (Map.class.isAssignableFrom(targetType) && value instanceof Map) {
Expand All@@ -857,7 +889,7 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 private List<?> convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type elementType = ReflectionUtil.resolveGenericParameter(token, List.class, 0);
 Class<?> componentType = ReflectionUtil.getRawType(elementType);
Expand DownExpand Up@@ -909,7 +941,7 @@ private Object convertListToNative(List<?> list, Class<?> targetType, Type gener

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 private Map<?, ?> convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type keyType = ReflectionUtil.resolveGenericParameter(token, Map.class, 0);
 Type valueType = ReflectionUtil.resolveGenericParameter(token, Map.class, 1);
Expand DownExpand Up@@ -970,6 +1002,36 @@ private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type gener
 return builder.buildOrThrow();
 }

 private Object convertListToArray(List<?> list, Class<?> targetType, Type genericType) {
 Class<?> componentType = targetType.getComponentType();
 Object array = Array.newInstance(componentType, list.size());
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 Type componentGenericType = componentToken.getType();

 for (int i = 0; i < list.size(); i++) {
 Object element = list.get(i);
 Object converted = toNative(element, componentType, componentGenericType);
 Array.set(array, i, converted);
 }
 return array;
 }

 private ImmutableList<Object> convertArrayToList(Object array) {
 int length = Array.getLength(array);
 ImmutableList.Builder<Object> builder = ImmutableList.builderWithExpectedSize(length);
 for (int i = 0; i < length; i++) {
 Object element = Array.get(array, i);
 if (element == null) {
 throw new CelInvalidArgumentException(String.format("Element at index %d is null.", i));
 }
 builder.add(toRuntimeValue(element));
 }
 return builder.build();
 }

 private Object downcastPrimitives(Object value, Class<?> targetType) {
 Class<?> wrappedTargetType = Primitives.wrap(targetType);
 if (wrappedTargetType == Integer.class && value instanceof Long) {
Expand Down

4 changes: 2 additions & 2 deletions
extensions/src/main/java/dev/cel/extensions/README.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1114,14 +1114,14 @@ The type-mapping between Java and CEL is as follows:
| `String` | `string` |
| `java.time.Duration` | `duration` |
| `java.time.Instant` | `timestamp` |
| `java.util.List` | `list` |
| `java.util.List`, `T[]` (except `byte[]`) | `list` |
| `java.util.Map` | `map` |
| `java.util.Optional` | `optional_type` |

### Notes

* This is only supported for the planner runtime (e.g., `CelRuntimeFactory.plannerRuntimeBuilder()`).
* Native Java arrays (except `byte[]`) are not supported. Use `java.util.List` instead.
* Native Java arrays are supported. `byte[]` maps to `bytes`, while other arrays map to `list`.
* Java `enum` properties are not currently supported and will be safely ignored during scanning.
* If there is a name collision with a Protobuf type, the protobuf type will take precedence.
* Instantiating new struct values (e.g., `Account{id: 1234}`) requires the class to have a no-argument constructor (public, protected, package-private, or private).
Expand Down

1 change: 1 addition & 0 deletions
extensions/src/test/java/dev/cel/extensions/BUILD.bazel

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -20,6 +20,7 @@ java_library(
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:divide_by_zero",
 "//common/exceptions:index_out_of_bounds",
 "//common/exceptions:invalid_argument",
 "//common/types",
 "//common/types:type_providers",
 "//common/values",
Expand Down

121 changes: 104 additions & 17 deletions
extensions/src/test/java/dev/cel/extensions/CelNativeTypesExtensionsTest.java

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,7 @@
import dev.cel.common.CelContainer;
import dev.cel.common.CelValidationException;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.types.CelType;
import dev.cel.common.types.ListType;
import dev.cel.common.types.MapType;
Expand DownExpand Up@@ -90,7 +91,8 @@ public final class CelNativeTypesExtensionsTest {
 TestGetterFieldTypeMismatchPojo.class,
 TestAbstractPojo.class,
 TestURLPojo.class,
 PojoWithEnum.class);
 PojoWithEnum.class,
 TestArrayPojo.class);

 private static final Cel CEL =
 CelFactory.plannerCelBuilder()
Expand DownExpand Up@@ -323,10 +325,10 @@ public void nativeTypes_anonymousClass_throwsException() {

 @Test
 public void nativeTypes_createStruct_privateConstructor() throws Exception {
 Object result = eval("TestPrivateConstructorPojo{value:" + " 'hello'}");
 TestPrivateConstructorPojo result =
 (TestPrivateConstructorPojo) eval("TestPrivateConstructorPojo{value:" + " 'hello'}");

 assertThat(result).isInstanceOf(TestPrivateConstructorPojo.class);
 assertThat(((TestPrivateConstructorPojo) result).value).isEqualTo("hello");
 assertThat(result.value).isEqualTo("hello");
 }

 @Test
Expand DownExpand Up@@ -375,10 +377,9 @@ public void nativeTypes_missingNoArgConstructor_throws() throws Exception {

 @Test
 public void nativeTypes_createWithDeepConversion() throws Exception {
 Object result = eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");

 assertThat(result).isInstanceOf(TestDeepConversionPojo.class);
 TestDeepConversionPojo pojo = (TestDeepConversionPojo) result;
 TestDeepConversionPojo pojo =
 (TestDeepConversionPojo)
 eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");
 assertThat(pojo.ints.get(0)).isEqualTo(1);
 assertThat(pojo.floats).containsEntry("a", 1.0f);
 }
Expand All@@ -398,11 +399,92 @@ public void nativeTypes_unsupportedTypeSet_throwsOnRegistration() throws Excepti
 }

 @Test
 public void nativeTypes_arrayType_throwsOnRegistration() throws Exception {
 IllegalArgumentException e =
 public void nativeTypes_arrayType_construction() throws Exception {
 String expr =
 "TestArrayPojo{"
 + " strings: ['a', 'b'],"
 + " ints: [1, 2],"
 + " nesteds: [TestNestedType{value: 'nested'}],"
 + " matrix: [[1, 2], [3, 4]],"
 + " nestedMatrix: [[TestNestedType{value: 'm1'}], [TestNestedType{value: 'm2'}]],"
 + " byteArrays: [b'foo', b'bar']"
 + "}";

 TestArrayPojo pojo = (TestArrayPojo) eval(expr);

 assertThat(pojo.strings).isEqualTo(new String[] {"a", "b"});
 assertThat(pojo.ints).isEqualTo(new int[] {1, 2});
 assertThat(pojo.nesteds).hasLength(1);
 assertThat(pojo.nesteds[0].value).isEqualTo("nested");
 assertThat(pojo.matrix).hasLength(2);
 assertThat(pojo.matrix[0]).isEqualTo(new int[] {1, 2});
 assertThat(pojo.matrix[1]).isEqualTo(new int[] {3, 4});
 assertThat(pojo.nestedMatrix).hasLength(2);
 assertThat(pojo.nestedMatrix[0][0].value).isEqualTo("m1");
 assertThat(pojo.nestedMatrix[1][0].value).isEqualTo("m2");
 assertThat(pojo.byteArrays).hasLength(2);
 assertThat(pojo.byteArrays[0]).isEqualTo("foo".getBytes(UTF_8));
 assertThat(pojo.byteArrays[1]).isEqualTo("bar".getBytes(UTF_8));
 }

 @Test
 public void nativeTypes_arrayType_selection() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 String expr =
 "pojo.strings[1] == 'b'"
 + " && pojo.ints[0] == 1"
 + " && pojo.nesteds[0].value == 'nested'"
 + " && pojo.matrix[1][0] == 3"
 + " && pojo.nestedMatrix[1][0].value == 'm2'"
 + " && pojo.byteArrays[1] == b'bar'";
 CelAbstractSyntaxTree ast = cel.compile(expr).getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", "b"};
 input.ints = new int[] {1, 2};
 TestNestedType nested = new TestNestedType();
 nested.value = "nested";
 input.nesteds = new TestNestedType[] {nested};
 input.matrix = new int[][] {{1, 2}, {3, 4}};
 TestNestedType m1 = new TestNestedType();
 m1.value = "m1";
 TestNestedType m2 = new TestNestedType();
 m2.value = "m2";
 input.nestedMatrix = new TestNestedType[][] {{m1}, {m2}};
 input.byteArrays = new byte[][] {"foo".getBytes(UTF_8), "bar".getBytes(UTF_8)};

 assertThat(program.eval(ImmutableMap.of("pojo", input))).isEqualTo(true);
 }

 @Test
 public void nativeTypes_arrayWithNullElement_throws() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 CelAbstractSyntaxTree ast = cel.compile("pojo.strings").getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", null, "c"};

 CelEvaluationException e =
 assertThrows(
 IllegalArgumentException.class, () -> CelExtensions.nativeTypes(TestArrayPojo.class));
 assertThat(e).hasMessageThat().contains("Unsupported type for property 'values'");
 CelEvaluationException.class, () -> program.eval(ImmutableMap.of("pojo", input)));
 assertThat(e).hasCauseThat().isInstanceOf(CelInvalidArgumentException.class);
 assertThat(e).hasCauseThat().hasMessageThat().contains("Element at index 1 is null.");
 }

 @Test
Expand DownExpand Up@@ -662,10 +744,7 @@ public void nativeTypes_createWithUint_fromUnsignedLong() throws Exception {
 .getAst();
 CelRuntime.Program program = celRuntime.createProgram(ast);

 Object result = program.eval();

 assertThat(result).isInstanceOf(TestAllTypesPublicFieldsPojo.class);
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) result;
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) program.eval();
 assertThat(pojo.uintVal).isEqualTo(UnsignedLong.fromLongBits(42L));
 }

Expand DownExpand Up@@ -782,6 +861,8 @@ public void nativeTypes_nullSafeTraversal() throws Exception {
 assertThat(cel.createProgram(cel.compile("pojo.int64Val").getAst()).eval(vars)).isEqualTo(0L);
 assertThat(cel.createProgram(cel.compile("pojo.nestedVal.value").getAst()).eval(vars))
 .isEqualTo("");
 assertThat(cel.createProgram(cel.compile("size(pojo.arrayVal) == 0").getAst()).eval(vars))
 .isEqualTo(true);
 CelAbstractSyntaxTree abstractPojoAst = cel.compile("pojo.abstractPojo.value").getAst();
 CelRuntime.Program abstractPojoProgram = cel.createProgram(abstractPojoAst);
 CelEvaluationException e =
Expand DownExpand Up@@ -942,6 +1023,7 @@ public String get() {
 public double doubleVal;
 public float floatVal;
 public byte[] bytesVal;
 public String[] arrayVal;
 public Duration durationVal;
 public Instant timestampVal;
 public TestNestedType nestedVal;
Expand DownExpand Up@@ -1259,7 +1341,12 @@ public static class TestWildcardPojo {
 }

 public static class TestArrayPojo {
 public String[] values;
 public String[] strings;
 public int[] ints;
 public TestNestedType[] nesteds;
 public int[][] matrix;
 public TestNestedType[][] nestedMatrix;
 public byte[][] byteArrays;
 }

 public static class TestOptionalUrlPojo {
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Jun 9, 2026
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Expand support to arrays to Native type extensions
#1069
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1 change: 1 addition & 0 deletions
extensions/src/main/java/dev/cel/extensions/BUILD.bazel

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -329,6 +329,7 @@ java_library(
 deps = [
 "//checker:checker_builder",
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:invalid_argument",
 "//common/internal:reflection_util",
 "//common/types",
 "//common/types:type_providers",
Expand Down

70 changes: 66 additions & 4 deletions
extensions/src/main/java/dev/cel/extensions/CelNativeTypesExtensions.java

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -28,6 +28,7 @@
import com.google.errorprone.annotations.Immutable;
import dev.cel.checker.CelCheckerBuilder;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.internal.ReflectionUtil;
import dev.cel.common.types.CelType;
import dev.cel.common.types.CelTypeProvider;
Expand All@@ -47,6 +48,7 @@
import dev.cel.runtime.CelRuntimeLibrary;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
Expand DownExpand Up@@ -289,6 +291,15 @@ private static CelType mapJavaTypeToCelType(
 return celType;
 }

 if (type.isArray()) {
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 return ListType.create(
 mapJavaTypeToCelType(componentToken.getRawType(), componentToken.getType(), classMap));
 }

 if (type.isInterface()
 && !List.class.isAssignableFrom(type)
 && !Map.class.isAssignableFrom(type)) {
Expand DownExpand Up@@ -416,6 +427,14 @@ private void discover(Type type) {
 TypeToken<?> token = TypeToken.of(type);
 Class<?> rawType = token.getRawType();

 if (rawType.isArray()) {
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 discover(componentToken.getType());
 return;
 }

 if (List.class.isAssignableFrom(rawType)) {
 discover(ReflectionUtil.resolveGenericParameter(token, List.class, 0));
 return;
Expand DownExpand Up@@ -775,6 +794,9 @@ private static Object getDefaultValue(Class<?> targetType) {
 if (Map.class.isAssignableFrom(targetType)) {
 return ImmutableMap.of();
 }
 if (targetType.isArray()) {
 return Array.newInstance(targetType.getComponentType(), 0);
 }

 try {
 Constructor<?> constructor = targetType.getDeclaredConstructor();
Expand DownExpand Up@@ -822,6 +844,10 @@ public Object toRuntimeValue(Object value) {
 return new PojoStructValue(value, accessors, registry.classToTypeMap.get(clazz));
 }

 if (clazz.isArray() && clazz != byte[].class) {
 return convertArrayToList(value);
 }

 return super.toRuntimeValue(value);
 }

Expand All@@ -844,8 +870,14 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {
 return ((CelByteString) value).toByteArray();
 }

 if (List.class.isAssignableFrom(targetType) && value instanceof List) {
 return convertListToNative((List<?>) value, targetType, genericType);
 if (value instanceof List) {
 List<?> listValue = (List<?>) value;
 if (List.class.isAssignableFrom(targetType)) {
 return convertListToNative(listValue, targetType, genericType);
 }
 if (targetType.isArray()) {
 return convertListToArray(listValue, targetType, genericType);
 }
 }

 if (Map.class.isAssignableFrom(targetType) && value instanceof Map) {
Expand All@@ -857,7 +889,7 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 private List<?> convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type elementType = ReflectionUtil.resolveGenericParameter(token, List.class, 0);
 Class<?> componentType = ReflectionUtil.getRawType(elementType);
Expand DownExpand Up@@ -909,7 +941,7 @@ private Object convertListToNative(List<?> list, Class<?> targetType, Type gener

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 private Map<?, ?> convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type keyType = ReflectionUtil.resolveGenericParameter(token, Map.class, 0);
 Type valueType = ReflectionUtil.resolveGenericParameter(token, Map.class, 1);
Expand DownExpand Up@@ -970,6 +1002,36 @@ private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type gener
 return builder.buildOrThrow();
 }

 private Object convertListToArray(List<?> list, Class<?> targetType, Type genericType) {
 Class<?> componentType = targetType.getComponentType();
 Object array = Array.newInstance(componentType, list.size());
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 Type componentGenericType = componentToken.getType();

 for (int i = 0; i < list.size(); i++) {
 Object element = list.get(i);
 Object converted = toNative(element, componentType, componentGenericType);
 Array.set(array, i, converted);
 }
 return array;
 }

 private ImmutableList<Object> convertArrayToList(Object array) {
 int length = Array.getLength(array);
 ImmutableList.Builder<Object> builder = ImmutableList.builderWithExpectedSize(length);
 for (int i = 0; i < length; i++) {
 Object element = Array.get(array, i);
 if (element == null) {
 throw new CelInvalidArgumentException(String.format("Element at index %d is null.", i));
 }
 builder.add(toRuntimeValue(element));
 }
 return builder.build();
 }

 private Object downcastPrimitives(Object value, Class<?> targetType) {
 Class<?> wrappedTargetType = Primitives.wrap(targetType);
 if (wrappedTargetType == Integer.class && value instanceof Long) {
Expand Down

4 changes: 2 additions & 2 deletions
extensions/src/main/java/dev/cel/extensions/README.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1114,14 +1114,14 @@ The type-mapping between Java and CEL is as follows:
| `String` | `string` |
| `java.time.Duration` | `duration` |
| `java.time.Instant` | `timestamp` |
| `java.util.List` | `list` |
| `java.util.List`, `T[]` (except `byte[]`) | `list` |
| `java.util.Map` | `map` |
| `java.util.Optional` | `optional_type` |

### Notes

* This is only supported for the planner runtime (e.g., `CelRuntimeFactory.plannerRuntimeBuilder()`).
* Native Java arrays (except `byte[]`) are not supported. Use `java.util.List` instead.
* Native Java arrays are supported. `byte[]` maps to `bytes`, while other arrays map to `list`.
* Java `enum` properties are not currently supported and will be safely ignored during scanning.
* If there is a name collision with a Protobuf type, the protobuf type will take precedence.
* Instantiating new struct values (e.g., `Account{id: 1234}`) requires the class to have a no-argument constructor (public, protected, package-private, or private).
Expand Down

1 change: 1 addition & 0 deletions
extensions/src/test/java/dev/cel/extensions/BUILD.bazel

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -20,6 +20,7 @@ java_library(
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:divide_by_zero",
 "//common/exceptions:index_out_of_bounds",
 "//common/exceptions:invalid_argument",
 "//common/types",
 "//common/types:type_providers",
 "//common/values",
Expand Down

121 changes: 104 additions & 17 deletions
extensions/src/test/java/dev/cel/extensions/CelNativeTypesExtensionsTest.java

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,7 @@
import dev.cel.common.CelContainer;
import dev.cel.common.CelValidationException;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.types.CelType;
import dev.cel.common.types.ListType;
import dev.cel.common.types.MapType;
Expand DownExpand Up@@ -90,7 +91,8 @@ public final class CelNativeTypesExtensionsTest {
 TestGetterFieldTypeMismatchPojo.class,
 TestAbstractPojo.class,
 TestURLPojo.class,
 PojoWithEnum.class);
 PojoWithEnum.class,
 TestArrayPojo.class);

 private static final Cel CEL =
 CelFactory.plannerCelBuilder()
Expand DownExpand Up@@ -323,10 +325,10 @@ public void nativeTypes_anonymousClass_throwsException() {

 @Test
 public void nativeTypes_createStruct_privateConstructor() throws Exception {
 Object result = eval("TestPrivateConstructorPojo{value:" + " 'hello'}");
 TestPrivateConstructorPojo result =
 (TestPrivateConstructorPojo) eval("TestPrivateConstructorPojo{value:" + " 'hello'}");

 assertThat(result).isInstanceOf(TestPrivateConstructorPojo.class);
 assertThat(((TestPrivateConstructorPojo) result).value).isEqualTo("hello");
 assertThat(result.value).isEqualTo("hello");
 }

 @Test
Expand DownExpand Up@@ -375,10 +377,9 @@ public void nativeTypes_missingNoArgConstructor_throws() throws Exception {

 @Test
 public void nativeTypes_createWithDeepConversion() throws Exception {
 Object result = eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");

 assertThat(result).isInstanceOf(TestDeepConversionPojo.class);
 TestDeepConversionPojo pojo = (TestDeepConversionPojo) result;
 TestDeepConversionPojo pojo =
 (TestDeepConversionPojo)
 eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");
 assertThat(pojo.ints.get(0)).isEqualTo(1);
 assertThat(pojo.floats).containsEntry("a", 1.0f);
 }
Expand All@@ -398,11 +399,92 @@ public void nativeTypes_unsupportedTypeSet_throwsOnRegistration() throws Excepti
 }

 @Test
 public void nativeTypes_arrayType_throwsOnRegistration() throws Exception {
 IllegalArgumentException e =
 public void nativeTypes_arrayType_construction() throws Exception {
 String expr =
 "TestArrayPojo{"
 + " strings: ['a', 'b'],"
 + " ints: [1, 2],"
 + " nesteds: [TestNestedType{value: 'nested'}],"
 + " matrix: [[1, 2], [3, 4]],"
 + " nestedMatrix: [[TestNestedType{value: 'm1'}], [TestNestedType{value: 'm2'}]],"
 + " byteArrays: [b'foo', b'bar']"
 + "}";

 TestArrayPojo pojo = (TestArrayPojo) eval(expr);

 assertThat(pojo.strings).isEqualTo(new String[] {"a", "b"});
 assertThat(pojo.ints).isEqualTo(new int[] {1, 2});
 assertThat(pojo.nesteds).hasLength(1);
 assertThat(pojo.nesteds[0].value).isEqualTo("nested");
 assertThat(pojo.matrix).hasLength(2);
 assertThat(pojo.matrix[0]).isEqualTo(new int[] {1, 2});
 assertThat(pojo.matrix[1]).isEqualTo(new int[] {3, 4});
 assertThat(pojo.nestedMatrix).hasLength(2);
 assertThat(pojo.nestedMatrix[0][0].value).isEqualTo("m1");
 assertThat(pojo.nestedMatrix[1][0].value).isEqualTo("m2");
 assertThat(pojo.byteArrays).hasLength(2);
 assertThat(pojo.byteArrays[0]).isEqualTo("foo".getBytes(UTF_8));
 assertThat(pojo.byteArrays[1]).isEqualTo("bar".getBytes(UTF_8));
 }

 @Test
 public void nativeTypes_arrayType_selection() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 String expr =
 "pojo.strings[1] == 'b'"
 + " && pojo.ints[0] == 1"
 + " && pojo.nesteds[0].value == 'nested'"
 + " && pojo.matrix[1][0] == 3"
 + " && pojo.nestedMatrix[1][0].value == 'm2'"
 + " && pojo.byteArrays[1] == b'bar'";
 CelAbstractSyntaxTree ast = cel.compile(expr).getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", "b"};
 input.ints = new int[] {1, 2};
 TestNestedType nested = new TestNestedType();
 nested.value = "nested";
 input.nesteds = new TestNestedType[] {nested};
 input.matrix = new int[][] {{1, 2}, {3, 4}};
 TestNestedType m1 = new TestNestedType();
 m1.value = "m1";
 TestNestedType m2 = new TestNestedType();
 m2.value = "m2";
 input.nestedMatrix = new TestNestedType[][] {{m1}, {m2}};
 input.byteArrays = new byte[][] {"foo".getBytes(UTF_8), "bar".getBytes(UTF_8)};

 assertThat(program.eval(ImmutableMap.of("pojo", input))).isEqualTo(true);
 }

 @Test
 public void nativeTypes_arrayWithNullElement_throws() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 CelAbstractSyntaxTree ast = cel.compile("pojo.strings").getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", null, "c"};

 CelEvaluationException e =
 assertThrows(
 IllegalArgumentException.class, () -> CelExtensions.nativeTypes(TestArrayPojo.class));
 assertThat(e).hasMessageThat().contains("Unsupported type for property 'values'");
 CelEvaluationException.class, () -> program.eval(ImmutableMap.of("pojo", input)));
 assertThat(e).hasCauseThat().isInstanceOf(CelInvalidArgumentException.class);
 assertThat(e).hasCauseThat().hasMessageThat().contains("Element at index 1 is null.");
 }

 @Test
Expand DownExpand Up@@ -662,10 +744,7 @@ public void nativeTypes_createWithUint_fromUnsignedLong() throws Exception {
 .getAst();
 CelRuntime.Program program = celRuntime.createProgram(ast);

 Object result = program.eval();

 assertThat(result).isInstanceOf(TestAllTypesPublicFieldsPojo.class);
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) result;
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) program.eval();
 assertThat(pojo.uintVal).isEqualTo(UnsignedLong.fromLongBits(42L));
 }

Expand DownExpand Up@@ -782,6 +861,8 @@ public void nativeTypes_nullSafeTraversal() throws Exception {
 assertThat(cel.createProgram(cel.compile("pojo.int64Val").getAst()).eval(vars)).isEqualTo(0L);
 assertThat(cel.createProgram(cel.compile("pojo.nestedVal.value").getAst()).eval(vars))
 .isEqualTo("");
 assertThat(cel.createProgram(cel.compile("size(pojo.arrayVal) == 0").getAst()).eval(vars))
 .isEqualTo(true);
 CelAbstractSyntaxTree abstractPojoAst = cel.compile("pojo.abstractPojo.value").getAst();
 CelRuntime.Program abstractPojoProgram = cel.createProgram(abstractPojoAst);
 CelEvaluationException e =
Expand DownExpand Up@@ -942,6 +1023,7 @@ public String get() {
 public double doubleVal;
 public float floatVal;
 public byte[] bytesVal;
 public String[] arrayVal;
 public Duration durationVal;
 public Instant timestampVal;
 public TestNestedType nestedVal;
Expand DownExpand Up@@ -1259,7 +1341,12 @@ public static class TestWildcardPojo {
 }

 public static class TestArrayPojo {
 public String[] values;
 public String[] strings;
 public int[] ints;
 public TestNestedType[] nesteds;
 public int[][] matrix;
 public TestNestedType[][] nestedMatrix;
 public byte[][] byteArrays;
 }

 public static class TestOptionalUrlPojo {
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Expand support to arrays to Native type extensions#1069

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copybara-service
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Jun 9, 2026
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Expand support to arrays to Native type extensions
#1069
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1 change: 1 addition & 0 deletions
extensions/src/main/java/dev/cel/extensions/BUILD.bazel

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -329,6 +329,7 @@ java_library(
 deps = [
 "//checker:checker_builder",
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:invalid_argument",
 "//common/internal:reflection_util",
 "//common/types",
 "//common/types:type_providers",
Expand Down

70 changes: 66 additions & 4 deletions
extensions/src/main/java/dev/cel/extensions/CelNativeTypesExtensions.java

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -28,6 +28,7 @@
import com.google.errorprone.annotations.Immutable;
import dev.cel.checker.CelCheckerBuilder;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.internal.ReflectionUtil;
import dev.cel.common.types.CelType;
import dev.cel.common.types.CelTypeProvider;
Expand All@@ -47,6 +48,7 @@
import dev.cel.runtime.CelRuntimeLibrary;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
Expand DownExpand Up@@ -289,6 +291,15 @@ private static CelType mapJavaTypeToCelType(
 return celType;
 }

 if (type.isArray()) {
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 return ListType.create(
 mapJavaTypeToCelType(componentToken.getRawType(), componentToken.getType(), classMap));
 }

 if (type.isInterface()
 && !List.class.isAssignableFrom(type)
 && !Map.class.isAssignableFrom(type)) {
Expand DownExpand Up@@ -416,6 +427,14 @@ private void discover(Type type) {
 TypeToken<?> token = TypeToken.of(type);
 Class<?> rawType = token.getRawType();

 if (rawType.isArray()) {
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 discover(componentToken.getType());
 return;
 }

 if (List.class.isAssignableFrom(rawType)) {
 discover(ReflectionUtil.resolveGenericParameter(token, List.class, 0));
 return;
Expand DownExpand Up@@ -775,6 +794,9 @@ private static Object getDefaultValue(Class<?> targetType) {
 if (Map.class.isAssignableFrom(targetType)) {
 return ImmutableMap.of();
 }
 if (targetType.isArray()) {
 return Array.newInstance(targetType.getComponentType(), 0);
 }

 try {
 Constructor<?> constructor = targetType.getDeclaredConstructor();
Expand DownExpand Up@@ -822,6 +844,10 @@ public Object toRuntimeValue(Object value) {
 return new PojoStructValue(value, accessors, registry.classToTypeMap.get(clazz));
 }

 if (clazz.isArray() && clazz != byte[].class) {
 return convertArrayToList(value);
 }

 return super.toRuntimeValue(value);
 }

Expand All@@ -844,8 +870,14 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {
 return ((CelByteString) value).toByteArray();
 }

 if (List.class.isAssignableFrom(targetType) && value instanceof List) {
 return convertListToNative((List<?>) value, targetType, genericType);
 if (value instanceof List) {
 List<?> listValue = (List<?>) value;
 if (List.class.isAssignableFrom(targetType)) {
 return convertListToNative(listValue, targetType, genericType);
 }
 if (targetType.isArray()) {
 return convertListToArray(listValue, targetType, genericType);
 }
 }

 if (Map.class.isAssignableFrom(targetType) && value instanceof Map) {
Expand All@@ -857,7 +889,7 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 private List<?> convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type elementType = ReflectionUtil.resolveGenericParameter(token, List.class, 0);
 Class<?> componentType = ReflectionUtil.getRawType(elementType);
Expand DownExpand Up@@ -909,7 +941,7 @@ private Object convertListToNative(List<?> list, Class<?> targetType, Type gener

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 private Map<?, ?> convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type keyType = ReflectionUtil.resolveGenericParameter(token, Map.class, 0);
 Type valueType = ReflectionUtil.resolveGenericParameter(token, Map.class, 1);
Expand DownExpand Up@@ -970,6 +1002,36 @@ private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type gener
 return builder.buildOrThrow();
 }

 private Object convertListToArray(List<?> list, Class<?> targetType, Type genericType) {
 Class<?> componentType = targetType.getComponentType();
 Object array = Array.newInstance(componentType, list.size());
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 Type componentGenericType = componentToken.getType();

 for (int i = 0; i < list.size(); i++) {
 Object element = list.get(i);
 Object converted = toNative(element, componentType, componentGenericType);
 Array.set(array, i, converted);
 }
 return array;
 }

 private ImmutableList<Object> convertArrayToList(Object array) {
 int length = Array.getLength(array);
 ImmutableList.Builder<Object> builder = ImmutableList.builderWithExpectedSize(length);
 for (int i = 0; i < length; i++) {
 Object element = Array.get(array, i);
 if (element == null) {
 throw new CelInvalidArgumentException(String.format("Element at index %d is null.", i));
 }
 builder.add(toRuntimeValue(element));
 }
 return builder.build();
 }

 private Object downcastPrimitives(Object value, Class<?> targetType) {
 Class<?> wrappedTargetType = Primitives.wrap(targetType);
 if (wrappedTargetType == Integer.class && value instanceof Long) {
Expand Down

4 changes: 2 additions & 2 deletions
extensions/src/main/java/dev/cel/extensions/README.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1114,14 +1114,14 @@ The type-mapping between Java and CEL is as follows:
| `String` | `string` |
| `java.time.Duration` | `duration` |
| `java.time.Instant` | `timestamp` |
| `java.util.List` | `list` |
| `java.util.List`, `T[]` (except `byte[]`) | `list` |
| `java.util.Map` | `map` |
| `java.util.Optional` | `optional_type` |

### Notes

* This is only supported for the planner runtime (e.g., `CelRuntimeFactory.plannerRuntimeBuilder()`).
* Native Java arrays (except `byte[]`) are not supported. Use `java.util.List` instead.
* Native Java arrays are supported. `byte[]` maps to `bytes`, while other arrays map to `list`.
* Java `enum` properties are not currently supported and will be safely ignored during scanning.
* If there is a name collision with a Protobuf type, the protobuf type will take precedence.
* Instantiating new struct values (e.g., `Account{id: 1234}`) requires the class to have a no-argument constructor (public, protected, package-private, or private).
Expand Down

1 change: 1 addition & 0 deletions
extensions/src/test/java/dev/cel/extensions/BUILD.bazel

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -20,6 +20,7 @@ java_library(
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:divide_by_zero",
 "//common/exceptions:index_out_of_bounds",
 "//common/exceptions:invalid_argument",
 "//common/types",
 "//common/types:type_providers",
 "//common/values",
Expand Down

121 changes: 104 additions & 17 deletions
extensions/src/test/java/dev/cel/extensions/CelNativeTypesExtensionsTest.java

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,7 @@
import dev.cel.common.CelContainer;
import dev.cel.common.CelValidationException;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.types.CelType;
import dev.cel.common.types.ListType;
import dev.cel.common.types.MapType;
Expand DownExpand Up@@ -90,7 +91,8 @@ public final class CelNativeTypesExtensionsTest {
 TestGetterFieldTypeMismatchPojo.class,
 TestAbstractPojo.class,
 TestURLPojo.class,
 PojoWithEnum.class);
 PojoWithEnum.class,
 TestArrayPojo.class);

 private static final Cel CEL =
 CelFactory.plannerCelBuilder()
Expand DownExpand Up@@ -323,10 +325,10 @@ public void nativeTypes_anonymousClass_throwsException() {

 @Test
 public void nativeTypes_createStruct_privateConstructor() throws Exception {
 Object result = eval("TestPrivateConstructorPojo{value:" + " 'hello'}");
 TestPrivateConstructorPojo result =
 (TestPrivateConstructorPojo) eval("TestPrivateConstructorPojo{value:" + " 'hello'}");

 assertThat(result).isInstanceOf(TestPrivateConstructorPojo.class);
 assertThat(((TestPrivateConstructorPojo) result).value).isEqualTo("hello");
 assertThat(result.value).isEqualTo("hello");
 }

 @Test
Expand DownExpand Up@@ -375,10 +377,9 @@ public void nativeTypes_missingNoArgConstructor_throws() throws Exception {

 @Test
 public void nativeTypes_createWithDeepConversion() throws Exception {
 Object result = eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");

 assertThat(result).isInstanceOf(TestDeepConversionPojo.class);
 TestDeepConversionPojo pojo = (TestDeepConversionPojo) result;
 TestDeepConversionPojo pojo =
 (TestDeepConversionPojo)
 eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");
 assertThat(pojo.ints.get(0)).isEqualTo(1);
 assertThat(pojo.floats).containsEntry("a", 1.0f);
 }
Expand All@@ -398,11 +399,92 @@ public void nativeTypes_unsupportedTypeSet_throwsOnRegistration() throws Excepti
 }

 @Test
 public void nativeTypes_arrayType_throwsOnRegistration() throws Exception {
 IllegalArgumentException e =
 public void nativeTypes_arrayType_construction() throws Exception {
 String expr =
 "TestArrayPojo{"
 + " strings: ['a', 'b'],"
 + " ints: [1, 2],"
 + " nesteds: [TestNestedType{value: 'nested'}],"
 + " matrix: [[1, 2], [3, 4]],"
 + " nestedMatrix: [[TestNestedType{value: 'm1'}], [TestNestedType{value: 'm2'}]],"
 + " byteArrays: [b'foo', b'bar']"
 + "}";

 TestArrayPojo pojo = (TestArrayPojo) eval(expr);

 assertThat(pojo.strings).isEqualTo(new String[] {"a", "b"});
 assertThat(pojo.ints).isEqualTo(new int[] {1, 2});
 assertThat(pojo.nesteds).hasLength(1);
 assertThat(pojo.nesteds[0].value).isEqualTo("nested");
 assertThat(pojo.matrix).hasLength(2);
 assertThat(pojo.matrix[0]).isEqualTo(new int[] {1, 2});
 assertThat(pojo.matrix[1]).isEqualTo(new int[] {3, 4});
 assertThat(pojo.nestedMatrix).hasLength(2);
 assertThat(pojo.nestedMatrix[0][0].value).isEqualTo("m1");
 assertThat(pojo.nestedMatrix[1][0].value).isEqualTo("m2");
 assertThat(pojo.byteArrays).hasLength(2);
 assertThat(pojo.byteArrays[0]).isEqualTo("foo".getBytes(UTF_8));
 assertThat(pojo.byteArrays[1]).isEqualTo("bar".getBytes(UTF_8));
 }

 @Test
 public void nativeTypes_arrayType_selection() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 String expr =
 "pojo.strings[1] == 'b'"
 + " && pojo.ints[0] == 1"
 + " && pojo.nesteds[0].value == 'nested'"
 + " && pojo.matrix[1][0] == 3"
 + " && pojo.nestedMatrix[1][0].value == 'm2'"
 + " && pojo.byteArrays[1] == b'bar'";
 CelAbstractSyntaxTree ast = cel.compile(expr).getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", "b"};
 input.ints = new int[] {1, 2};
 TestNestedType nested = new TestNestedType();
 nested.value = "nested";
 input.nesteds = new TestNestedType[] {nested};
 input.matrix = new int[][] {{1, 2}, {3, 4}};
 TestNestedType m1 = new TestNestedType();
 m1.value = "m1";
 TestNestedType m2 = new TestNestedType();
 m2.value = "m2";
 input.nestedMatrix = new TestNestedType[][] {{m1}, {m2}};
 input.byteArrays = new byte[][] {"foo".getBytes(UTF_8), "bar".getBytes(UTF_8)};

 assertThat(program.eval(ImmutableMap.of("pojo", input))).isEqualTo(true);
 }

 @Test
 public void nativeTypes_arrayWithNullElement_throws() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 CelAbstractSyntaxTree ast = cel.compile("pojo.strings").getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", null, "c"};

 CelEvaluationException e =
 assertThrows(
 IllegalArgumentException.class, () -> CelExtensions.nativeTypes(TestArrayPojo.class));
 assertThat(e).hasMessageThat().contains("Unsupported type for property 'values'");
 CelEvaluationException.class, () -> program.eval(ImmutableMap.of("pojo", input)));
 assertThat(e).hasCauseThat().isInstanceOf(CelInvalidArgumentException.class);
 assertThat(e).hasCauseThat().hasMessageThat().contains("Element at index 1 is null.");
 }

 @Test
Expand DownExpand Up@@ -662,10 +744,7 @@ public void nativeTypes_createWithUint_fromUnsignedLong() throws Exception {
 .getAst();
 CelRuntime.Program program = celRuntime.createProgram(ast);

 Object result = program.eval();

 assertThat(result).isInstanceOf(TestAllTypesPublicFieldsPojo.class);
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) result;
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) program.eval();
 assertThat(pojo.uintVal).isEqualTo(UnsignedLong.fromLongBits(42L));
 }

Expand DownExpand Up@@ -782,6 +861,8 @@ public void nativeTypes_nullSafeTraversal() throws Exception {
 assertThat(cel.createProgram(cel.compile("pojo.int64Val").getAst()).eval(vars)).isEqualTo(0L);
 assertThat(cel.createProgram(cel.compile("pojo.nestedVal.value").getAst()).eval(vars))
 .isEqualTo("");
 assertThat(cel.createProgram(cel.compile("size(pojo.arrayVal) == 0").getAst()).eval(vars))
 .isEqualTo(true);
 CelAbstractSyntaxTree abstractPojoAst = cel.compile("pojo.abstractPojo.value").getAst();
 CelRuntime.Program abstractPojoProgram = cel.createProgram(abstractPojoAst);
 CelEvaluationException e =
Expand DownExpand Up@@ -942,6 +1023,7 @@ public String get() {
 public double doubleVal;
 public float floatVal;
 public byte[] bytesVal;
 public String[] arrayVal;
 public Duration durationVal;
 public Instant timestampVal;
 public TestNestedType nestedVal;
Expand DownExpand Up@@ -1259,7 +1341,12 @@ public static class TestWildcardPojo {
 }

 public static class TestArrayPojo {
 public String[] values;
 public String[] strings;
 public int[] ints;
 public TestNestedType[] nesteds;
 public int[][] matrix;
 public TestNestedType[][] nestedMatrix;
 public byte[][] byteArrays;
 }

 public static class TestOptionalUrlPojo {
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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Expand support to arrays to Native type extensions#1069

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 Merged

copybara-service
merged 1 commit into

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Jun 9, 2026
 Merged


Expand support to arrays to Native type extensions
#1069
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1 change: 1 addition & 0 deletions
extensions/src/main/java/dev/cel/extensions/BUILD.bazel

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -329,6 +329,7 @@ java_library(
 deps = [
 "//checker:checker_builder",
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:invalid_argument",
 "//common/internal:reflection_util",
 "//common/types",
 "//common/types:type_providers",
Expand Down

70 changes: 66 additions & 4 deletions
extensions/src/main/java/dev/cel/extensions/CelNativeTypesExtensions.java

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -28,6 +28,7 @@
import com.google.errorprone.annotations.Immutable;
import dev.cel.checker.CelCheckerBuilder;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.internal.ReflectionUtil;
import dev.cel.common.types.CelType;
import dev.cel.common.types.CelTypeProvider;
Expand All@@ -47,6 +48,7 @@
import dev.cel.runtime.CelRuntimeLibrary;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
Expand DownExpand Up@@ -289,6 +291,15 @@ private static CelType mapJavaTypeToCelType(
 return celType;
 }

 if (type.isArray()) {
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 return ListType.create(
 mapJavaTypeToCelType(componentToken.getRawType(), componentToken.getType(), classMap));
 }

 if (type.isInterface()
 && !List.class.isAssignableFrom(type)
 && !Map.class.isAssignableFrom(type)) {
Expand DownExpand Up@@ -416,6 +427,14 @@ private void discover(Type type) {
 TypeToken<?> token = TypeToken.of(type);
 Class<?> rawType = token.getRawType();

 if (rawType.isArray()) {
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 discover(componentToken.getType());
 return;
 }

 if (List.class.isAssignableFrom(rawType)) {
 discover(ReflectionUtil.resolveGenericParameter(token, List.class, 0));
 return;
Expand DownExpand Up@@ -775,6 +794,9 @@ private static Object getDefaultValue(Class<?> targetType) {
 if (Map.class.isAssignableFrom(targetType)) {
 return ImmutableMap.of();
 }
 if (targetType.isArray()) {
 return Array.newInstance(targetType.getComponentType(), 0);
 }

 try {
 Constructor<?> constructor = targetType.getDeclaredConstructor();
Expand DownExpand Up@@ -822,6 +844,10 @@ public Object toRuntimeValue(Object value) {
 return new PojoStructValue(value, accessors, registry.classToTypeMap.get(clazz));
 }

 if (clazz.isArray() && clazz != byte[].class) {
 return convertArrayToList(value);
 }

 return super.toRuntimeValue(value);
 }

Expand All@@ -844,8 +870,14 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {
 return ((CelByteString) value).toByteArray();
 }

 if (List.class.isAssignableFrom(targetType) && value instanceof List) {
 return convertListToNative((List<?>) value, targetType, genericType);
 if (value instanceof List) {
 List<?> listValue = (List<?>) value;
 if (List.class.isAssignableFrom(targetType)) {
 return convertListToNative(listValue, targetType, genericType);
 }
 if (targetType.isArray()) {
 return convertListToArray(listValue, targetType, genericType);
 }
 }

 if (Map.class.isAssignableFrom(targetType) && value instanceof Map) {
Expand All@@ -857,7 +889,7 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 private List<?> convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type elementType = ReflectionUtil.resolveGenericParameter(token, List.class, 0);
 Class<?> componentType = ReflectionUtil.getRawType(elementType);
Expand DownExpand Up@@ -909,7 +941,7 @@ private Object convertListToNative(List<?> list, Class<?> targetType, Type gener

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 private Map<?, ?> convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type keyType = ReflectionUtil.resolveGenericParameter(token, Map.class, 0);
 Type valueType = ReflectionUtil.resolveGenericParameter(token, Map.class, 1);
Expand DownExpand Up@@ -970,6 +1002,36 @@ private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type gener
 return builder.buildOrThrow();
 }

 private Object convertListToArray(List<?> list, Class<?> targetType, Type genericType) {
 Class<?> componentType = targetType.getComponentType();
 Object array = Array.newInstance(componentType, list.size());
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 Type componentGenericType = componentToken.getType();

 for (int i = 0; i < list.size(); i++) {
 Object element = list.get(i);
 Object converted = toNative(element, componentType, componentGenericType);
 Array.set(array, i, converted);
 }
 return array;
 }

 private ImmutableList<Object> convertArrayToList(Object array) {
 int length = Array.getLength(array);
 ImmutableList.Builder<Object> builder = ImmutableList.builderWithExpectedSize(length);
 for (int i = 0; i < length; i++) {
 Object element = Array.get(array, i);
 if (element == null) {
 throw new CelInvalidArgumentException(String.format("Element at index %d is null.", i));
 }
 builder.add(toRuntimeValue(element));
 }
 return builder.build();
 }

 private Object downcastPrimitives(Object value, Class<?> targetType) {
 Class<?> wrappedTargetType = Primitives.wrap(targetType);
 if (wrappedTargetType == Integer.class && value instanceof Long) {
Expand Down

4 changes: 2 additions & 2 deletions
extensions/src/main/java/dev/cel/extensions/README.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1114,14 +1114,14 @@ The type-mapping between Java and CEL is as follows:
| `String` | `string` |
| `java.time.Duration` | `duration` |
| `java.time.Instant` | `timestamp` |
| `java.util.List` | `list` |
| `java.util.List`, `T[]` (except `byte[]`) | `list` |
| `java.util.Map` | `map` |
| `java.util.Optional` | `optional_type` |

### Notes

* This is only supported for the planner runtime (e.g., `CelRuntimeFactory.plannerRuntimeBuilder()`).
* Native Java arrays (except `byte[]`) are not supported. Use `java.util.List` instead.
* Native Java arrays are supported. `byte[]` maps to `bytes`, while other arrays map to `list`.
* Java `enum` properties are not currently supported and will be safely ignored during scanning.
* If there is a name collision with a Protobuf type, the protobuf type will take precedence.
* Instantiating new struct values (e.g., `Account{id: 1234}`) requires the class to have a no-argument constructor (public, protected, package-private, or private).
Expand Down

1 change: 1 addition & 0 deletions
extensions/src/test/java/dev/cel/extensions/BUILD.bazel

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -20,6 +20,7 @@ java_library(
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:divide_by_zero",
 "//common/exceptions:index_out_of_bounds",
 "//common/exceptions:invalid_argument",
 "//common/types",
 "//common/types:type_providers",
 "//common/values",
Expand Down

121 changes: 104 additions & 17 deletions
extensions/src/test/java/dev/cel/extensions/CelNativeTypesExtensionsTest.java

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,7 @@
import dev.cel.common.CelContainer;
import dev.cel.common.CelValidationException;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.types.CelType;
import dev.cel.common.types.ListType;
import dev.cel.common.types.MapType;
Expand DownExpand Up@@ -90,7 +91,8 @@ public final class CelNativeTypesExtensionsTest {
 TestGetterFieldTypeMismatchPojo.class,
 TestAbstractPojo.class,
 TestURLPojo.class,
 PojoWithEnum.class);
 PojoWithEnum.class,
 TestArrayPojo.class);

 private static final Cel CEL =
 CelFactory.plannerCelBuilder()
Expand DownExpand Up@@ -323,10 +325,10 @@ public void nativeTypes_anonymousClass_throwsException() {

 @Test
 public void nativeTypes_createStruct_privateConstructor() throws Exception {
 Object result = eval("TestPrivateConstructorPojo{value:" + " 'hello'}");
 TestPrivateConstructorPojo result =
 (TestPrivateConstructorPojo) eval("TestPrivateConstructorPojo{value:" + " 'hello'}");

 assertThat(result).isInstanceOf(TestPrivateConstructorPojo.class);
 assertThat(((TestPrivateConstructorPojo) result).value).isEqualTo("hello");
 assertThat(result.value).isEqualTo("hello");
 }

 @Test
Expand DownExpand Up@@ -375,10 +377,9 @@ public void nativeTypes_missingNoArgConstructor_throws() throws Exception {

 @Test
 public void nativeTypes_createWithDeepConversion() throws Exception {
 Object result = eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");

 assertThat(result).isInstanceOf(TestDeepConversionPojo.class);
 TestDeepConversionPojo pojo = (TestDeepConversionPojo) result;
 TestDeepConversionPojo pojo =
 (TestDeepConversionPojo)
 eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");
 assertThat(pojo.ints.get(0)).isEqualTo(1);
 assertThat(pojo.floats).containsEntry("a", 1.0f);
 }
Expand All@@ -398,11 +399,92 @@ public void nativeTypes_unsupportedTypeSet_throwsOnRegistration() throws Excepti
 }

 @Test
 public void nativeTypes_arrayType_throwsOnRegistration() throws Exception {
 IllegalArgumentException e =
 public void nativeTypes_arrayType_construction() throws Exception {
 String expr =
 "TestArrayPojo{"
 + " strings: ['a', 'b'],"
 + " ints: [1, 2],"
 + " nesteds: [TestNestedType{value: 'nested'}],"
 + " matrix: [[1, 2], [3, 4]],"
 + " nestedMatrix: [[TestNestedType{value: 'm1'}], [TestNestedType{value: 'm2'}]],"
 + " byteArrays: [b'foo', b'bar']"
 + "}";

 TestArrayPojo pojo = (TestArrayPojo) eval(expr);

 assertThat(pojo.strings).isEqualTo(new String[] {"a", "b"});
 assertThat(pojo.ints).isEqualTo(new int[] {1, 2});
 assertThat(pojo.nesteds).hasLength(1);
 assertThat(pojo.nesteds[0].value).isEqualTo("nested");
 assertThat(pojo.matrix).hasLength(2);
 assertThat(pojo.matrix[0]).isEqualTo(new int[] {1, 2});
 assertThat(pojo.matrix[1]).isEqualTo(new int[] {3, 4});
 assertThat(pojo.nestedMatrix).hasLength(2);
 assertThat(pojo.nestedMatrix[0][0].value).isEqualTo("m1");
 assertThat(pojo.nestedMatrix[1][0].value).isEqualTo("m2");
 assertThat(pojo.byteArrays).hasLength(2);
 assertThat(pojo.byteArrays[0]).isEqualTo("foo".getBytes(UTF_8));
 assertThat(pojo.byteArrays[1]).isEqualTo("bar".getBytes(UTF_8));
 }

 @Test
 public void nativeTypes_arrayType_selection() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 String expr =
 "pojo.strings[1] == 'b'"
 + " && pojo.ints[0] == 1"
 + " && pojo.nesteds[0].value == 'nested'"
 + " && pojo.matrix[1][0] == 3"
 + " && pojo.nestedMatrix[1][0].value == 'm2'"
 + " && pojo.byteArrays[1] == b'bar'";
 CelAbstractSyntaxTree ast = cel.compile(expr).getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", "b"};
 input.ints = new int[] {1, 2};
 TestNestedType nested = new TestNestedType();
 nested.value = "nested";
 input.nesteds = new TestNestedType[] {nested};
 input.matrix = new int[][] {{1, 2}, {3, 4}};
 TestNestedType m1 = new TestNestedType();
 m1.value = "m1";
 TestNestedType m2 = new TestNestedType();
 m2.value = "m2";
 input.nestedMatrix = new TestNestedType[][] {{m1}, {m2}};
 input.byteArrays = new byte[][] {"foo".getBytes(UTF_8), "bar".getBytes(UTF_8)};

 assertThat(program.eval(ImmutableMap.of("pojo", input))).isEqualTo(true);
 }

 @Test
 public void nativeTypes_arrayWithNullElement_throws() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 CelAbstractSyntaxTree ast = cel.compile("pojo.strings").getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", null, "c"};

 CelEvaluationException e =
 assertThrows(
 IllegalArgumentException.class, () -> CelExtensions.nativeTypes(TestArrayPojo.class));
 assertThat(e).hasMessageThat().contains("Unsupported type for property 'values'");
 CelEvaluationException.class, () -> program.eval(ImmutableMap.of("pojo", input)));
 assertThat(e).hasCauseThat().isInstanceOf(CelInvalidArgumentException.class);
 assertThat(e).hasCauseThat().hasMessageThat().contains("Element at index 1 is null.");
 }

 @Test
Expand DownExpand Up@@ -662,10 +744,7 @@ public void nativeTypes_createWithUint_fromUnsignedLong() throws Exception {
 .getAst();
 CelRuntime.Program program = celRuntime.createProgram(ast);

 Object result = program.eval();

 assertThat(result).isInstanceOf(TestAllTypesPublicFieldsPojo.class);
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) result;
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) program.eval();
 assertThat(pojo.uintVal).isEqualTo(UnsignedLong.fromLongBits(42L));
 }

Expand DownExpand Up@@ -782,6 +861,8 @@ public void nativeTypes_nullSafeTraversal() throws Exception {
 assertThat(cel.createProgram(cel.compile("pojo.int64Val").getAst()).eval(vars)).isEqualTo(0L);
 assertThat(cel.createProgram(cel.compile("pojo.nestedVal.value").getAst()).eval(vars))
 .isEqualTo("");
 assertThat(cel.createProgram(cel.compile("size(pojo.arrayVal) == 0").getAst()).eval(vars))
 .isEqualTo(true);
 CelAbstractSyntaxTree abstractPojoAst = cel.compile("pojo.abstractPojo.value").getAst();
 CelRuntime.Program abstractPojoProgram = cel.createProgram(abstractPojoAst);
 CelEvaluationException e =
Expand DownExpand Up@@ -942,6 +1023,7 @@ public String get() {
 public double doubleVal;
 public float floatVal;
 public byte[] bytesVal;
 public String[] arrayVal;
 public Duration durationVal;
 public Instant timestampVal;
 public TestNestedType nestedVal;
Expand DownExpand Up@@ -1259,7 +1341,12 @@ public static class TestWildcardPojo {
 }

 public static class TestArrayPojo {
 public String[] values;
 public String[] strings;
 public int[] ints;
 public TestNestedType[] nesteds;
 public int[][] matrix;
 public TestNestedType[][] nestedMatrix;
 public byte[][] byteArrays;
 }

 public static class TestOptionalUrlPojo {
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Expand support to arrays to Native type extensions
#1069
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1 change: 1 addition & 0 deletions
extensions/src/main/java/dev/cel/extensions/BUILD.bazel

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -329,6 +329,7 @@ java_library(
 deps = [
 "//checker:checker_builder",
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:invalid_argument",
 "//common/internal:reflection_util",
 "//common/types",
 "//common/types:type_providers",
Expand Down

70 changes: 66 additions & 4 deletions
extensions/src/main/java/dev/cel/extensions/CelNativeTypesExtensions.java

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -28,6 +28,7 @@
import com.google.errorprone.annotations.Immutable;
import dev.cel.checker.CelCheckerBuilder;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.internal.ReflectionUtil;
import dev.cel.common.types.CelType;
import dev.cel.common.types.CelTypeProvider;
Expand All@@ -47,6 +48,7 @@
import dev.cel.runtime.CelRuntimeLibrary;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
Expand DownExpand Up@@ -289,6 +291,15 @@ private static CelType mapJavaTypeToCelType(
 return celType;
 }

 if (type.isArray()) {
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 return ListType.create(
 mapJavaTypeToCelType(componentToken.getRawType(), componentToken.getType(), classMap));
 }

 if (type.isInterface()
 && !List.class.isAssignableFrom(type)
 && !Map.class.isAssignableFrom(type)) {
Expand DownExpand Up@@ -416,6 +427,14 @@ private void discover(Type type) {
 TypeToken<?> token = TypeToken.of(type);
 Class<?> rawType = token.getRawType();

 if (rawType.isArray()) {
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 discover(componentToken.getType());
 return;
 }

 if (List.class.isAssignableFrom(rawType)) {
 discover(ReflectionUtil.resolveGenericParameter(token, List.class, 0));
 return;
Expand DownExpand Up@@ -775,6 +794,9 @@ private static Object getDefaultValue(Class<?> targetType) {
 if (Map.class.isAssignableFrom(targetType)) {
 return ImmutableMap.of();
 }
 if (targetType.isArray()) {
 return Array.newInstance(targetType.getComponentType(), 0);
 }

 try {
 Constructor<?> constructor = targetType.getDeclaredConstructor();
Expand DownExpand Up@@ -822,6 +844,10 @@ public Object toRuntimeValue(Object value) {
 return new PojoStructValue(value, accessors, registry.classToTypeMap.get(clazz));
 }

 if (clazz.isArray() && clazz != byte[].class) {
 return convertArrayToList(value);
 }

 return super.toRuntimeValue(value);
 }

Expand All@@ -844,8 +870,14 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {
 return ((CelByteString) value).toByteArray();
 }

 if (List.class.isAssignableFrom(targetType) && value instanceof List) {
 return convertListToNative((List<?>) value, targetType, genericType);
 if (value instanceof List) {
 List<?> listValue = (List<?>) value;
 if (List.class.isAssignableFrom(targetType)) {
 return convertListToNative(listValue, targetType, genericType);
 }
 if (targetType.isArray()) {
 return convertListToArray(listValue, targetType, genericType);
 }
 }

 if (Map.class.isAssignableFrom(targetType) && value instanceof Map) {
Expand All@@ -857,7 +889,7 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 private List<?> convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type elementType = ReflectionUtil.resolveGenericParameter(token, List.class, 0);
 Class<?> componentType = ReflectionUtil.getRawType(elementType);
Expand DownExpand Up@@ -909,7 +941,7 @@ private Object convertListToNative(List<?> list, Class<?> targetType, Type gener

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 private Map<?, ?> convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type keyType = ReflectionUtil.resolveGenericParameter(token, Map.class, 0);
 Type valueType = ReflectionUtil.resolveGenericParameter(token, Map.class, 1);
Expand DownExpand Up@@ -970,6 +1002,36 @@ private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type gener
 return builder.buildOrThrow();
 }

 private Object convertListToArray(List<?> list, Class<?> targetType, Type genericType) {
 Class<?> componentType = targetType.getComponentType();
 Object array = Array.newInstance(componentType, list.size());
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 Type componentGenericType = componentToken.getType();

 for (int i = 0; i < list.size(); i++) {
 Object element = list.get(i);
 Object converted = toNative(element, componentType, componentGenericType);
 Array.set(array, i, converted);
 }
 return array;
 }

 private ImmutableList<Object> convertArrayToList(Object array) {
 int length = Array.getLength(array);
 ImmutableList.Builder<Object> builder = ImmutableList.builderWithExpectedSize(length);
 for (int i = 0; i < length; i++) {
 Object element = Array.get(array, i);
 if (element == null) {
 throw new CelInvalidArgumentException(String.format("Element at index %d is null.", i));
 }
 builder.add(toRuntimeValue(element));
 }
 return builder.build();
 }

 private Object downcastPrimitives(Object value, Class<?> targetType) {
 Class<?> wrappedTargetType = Primitives.wrap(targetType);
 if (wrappedTargetType == Integer.class && value instanceof Long) {
Expand Down

4 changes: 2 additions & 2 deletions
extensions/src/main/java/dev/cel/extensions/README.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1114,14 +1114,14 @@ The type-mapping between Java and CEL is as follows:
| `String` | `string` |
| `java.time.Duration` | `duration` |
| `java.time.Instant` | `timestamp` |
| `java.util.List` | `list` |
| `java.util.List`, `T[]` (except `byte[]`) | `list` |
| `java.util.Map` | `map` |
| `java.util.Optional` | `optional_type` |

### Notes

* This is only supported for the planner runtime (e.g., `CelRuntimeFactory.plannerRuntimeBuilder()`).
* Native Java arrays (except `byte[]`) are not supported. Use `java.util.List` instead.
* Native Java arrays are supported. `byte[]` maps to `bytes`, while other arrays map to `list`.
* Java `enum` properties are not currently supported and will be safely ignored during scanning.
* If there is a name collision with a Protobuf type, the protobuf type will take precedence.
* Instantiating new struct values (e.g., `Account{id: 1234}`) requires the class to have a no-argument constructor (public, protected, package-private, or private).
Expand Down

1 change: 1 addition & 0 deletions
extensions/src/test/java/dev/cel/extensions/BUILD.bazel

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -20,6 +20,7 @@ java_library(
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:divide_by_zero",
 "//common/exceptions:index_out_of_bounds",
 "//common/exceptions:invalid_argument",
 "//common/types",
 "//common/types:type_providers",
 "//common/values",
Expand Down

121 changes: 104 additions & 17 deletions
extensions/src/test/java/dev/cel/extensions/CelNativeTypesExtensionsTest.java

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,7 @@
import dev.cel.common.CelContainer;
import dev.cel.common.CelValidationException;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.types.CelType;
import dev.cel.common.types.ListType;
import dev.cel.common.types.MapType;
Expand DownExpand Up@@ -90,7 +91,8 @@ public final class CelNativeTypesExtensionsTest {
 TestGetterFieldTypeMismatchPojo.class,
 TestAbstractPojo.class,
 TestURLPojo.class,
 PojoWithEnum.class);
 PojoWithEnum.class,
 TestArrayPojo.class);

 private static final Cel CEL =
 CelFactory.plannerCelBuilder()
Expand DownExpand Up@@ -323,10 +325,10 @@ public void nativeTypes_anonymousClass_throwsException() {

 @Test
 public void nativeTypes_createStruct_privateConstructor() throws Exception {
 Object result = eval("TestPrivateConstructorPojo{value:" + " 'hello'}");
 TestPrivateConstructorPojo result =
 (TestPrivateConstructorPojo) eval("TestPrivateConstructorPojo{value:" + " 'hello'}");

 assertThat(result).isInstanceOf(TestPrivateConstructorPojo.class);
 assertThat(((TestPrivateConstructorPojo) result).value).isEqualTo("hello");
 assertThat(result.value).isEqualTo("hello");
 }

 @Test
Expand DownExpand Up@@ -375,10 +377,9 @@ public void nativeTypes_missingNoArgConstructor_throws() throws Exception {

 @Test
 public void nativeTypes_createWithDeepConversion() throws Exception {
 Object result = eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");

 assertThat(result).isInstanceOf(TestDeepConversionPojo.class);
 TestDeepConversionPojo pojo = (TestDeepConversionPojo) result;
 TestDeepConversionPojo pojo =
 (TestDeepConversionPojo)
 eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");
 assertThat(pojo.ints.get(0)).isEqualTo(1);
 assertThat(pojo.floats).containsEntry("a", 1.0f);
 }
Expand All@@ -398,11 +399,92 @@ public void nativeTypes_unsupportedTypeSet_throwsOnRegistration() throws Excepti
 }

 @Test
 public void nativeTypes_arrayType_throwsOnRegistration() throws Exception {
 IllegalArgumentException e =
 public void nativeTypes_arrayType_construction() throws Exception {
 String expr =
 "TestArrayPojo{"
 + " strings: ['a', 'b'],"
 + " ints: [1, 2],"
 + " nesteds: [TestNestedType{value: 'nested'}],"
 + " matrix: [[1, 2], [3, 4]],"
 + " nestedMatrix: [[TestNestedType{value: 'm1'}], [TestNestedType{value: 'm2'}]],"
 + " byteArrays: [b'foo', b'bar']"
 + "}";

 TestArrayPojo pojo = (TestArrayPojo) eval(expr);

 assertThat(pojo.strings).isEqualTo(new String[] {"a", "b"});
 assertThat(pojo.ints).isEqualTo(new int[] {1, 2});
 assertThat(pojo.nesteds).hasLength(1);
 assertThat(pojo.nesteds[0].value).isEqualTo("nested");
 assertThat(pojo.matrix).hasLength(2);
 assertThat(pojo.matrix[0]).isEqualTo(new int[] {1, 2});
 assertThat(pojo.matrix[1]).isEqualTo(new int[] {3, 4});
 assertThat(pojo.nestedMatrix).hasLength(2);
 assertThat(pojo.nestedMatrix[0][0].value).isEqualTo("m1");
 assertThat(pojo.nestedMatrix[1][0].value).isEqualTo("m2");
 assertThat(pojo.byteArrays).hasLength(2);
 assertThat(pojo.byteArrays[0]).isEqualTo("foo".getBytes(UTF_8));
 assertThat(pojo.byteArrays[1]).isEqualTo("bar".getBytes(UTF_8));
 }

 @Test
 public void nativeTypes_arrayType_selection() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 String expr =
 "pojo.strings[1] == 'b'"
 + " && pojo.ints[0] == 1"
 + " && pojo.nesteds[0].value == 'nested'"
 + " && pojo.matrix[1][0] == 3"
 + " && pojo.nestedMatrix[1][0].value == 'm2'"
 + " && pojo.byteArrays[1] == b'bar'";
 CelAbstractSyntaxTree ast = cel.compile(expr).getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", "b"};
 input.ints = new int[] {1, 2};
 TestNestedType nested = new TestNestedType();
 nested.value = "nested";
 input.nesteds = new TestNestedType[] {nested};
 input.matrix = new int[][] {{1, 2}, {3, 4}};
 TestNestedType m1 = new TestNestedType();
 m1.value = "m1";
 TestNestedType m2 = new TestNestedType();
 m2.value = "m2";
 input.nestedMatrix = new TestNestedType[][] {{m1}, {m2}};
 input.byteArrays = new byte[][] {"foo".getBytes(UTF_8), "bar".getBytes(UTF_8)};

 assertThat(program.eval(ImmutableMap.of("pojo", input))).isEqualTo(true);
 }

 @Test
 public void nativeTypes_arrayWithNullElement_throws() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 CelAbstractSyntaxTree ast = cel.compile("pojo.strings").getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", null, "c"};

 CelEvaluationException e =
 assertThrows(
 IllegalArgumentException.class, () -> CelExtensions.nativeTypes(TestArrayPojo.class));
 assertThat(e).hasMessageThat().contains("Unsupported type for property 'values'");
 CelEvaluationException.class, () -> program.eval(ImmutableMap.of("pojo", input)));
 assertThat(e).hasCauseThat().isInstanceOf(CelInvalidArgumentException.class);
 assertThat(e).hasCauseThat().hasMessageThat().contains("Element at index 1 is null.");
 }

 @Test
Expand DownExpand Up@@ -662,10 +744,7 @@ public void nativeTypes_createWithUint_fromUnsignedLong() throws Exception {
 .getAst();
 CelRuntime.Program program = celRuntime.createProgram(ast);

 Object result = program.eval();

 assertThat(result).isInstanceOf(TestAllTypesPublicFieldsPojo.class);
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) result;
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) program.eval();
 assertThat(pojo.uintVal).isEqualTo(UnsignedLong.fromLongBits(42L));
 }

Expand DownExpand Up@@ -782,6 +861,8 @@ public void nativeTypes_nullSafeTraversal() throws Exception {
 assertThat(cel.createProgram(cel.compile("pojo.int64Val").getAst()).eval(vars)).isEqualTo(0L);
 assertThat(cel.createProgram(cel.compile("pojo.nestedVal.value").getAst()).eval(vars))
 .isEqualTo("");
 assertThat(cel.createProgram(cel.compile("size(pojo.arrayVal) == 0").getAst()).eval(vars))
 .isEqualTo(true);
 CelAbstractSyntaxTree abstractPojoAst = cel.compile("pojo.abstractPojo.value").getAst();
 CelRuntime.Program abstractPojoProgram = cel.createProgram(abstractPojoAst);
 CelEvaluationException e =
Expand DownExpand Up@@ -942,6 +1023,7 @@ public String get() {
 public double doubleVal;
 public float floatVal;
 public byte[] bytesVal;
 public String[] arrayVal;
 public Duration durationVal;
 public Instant timestampVal;
 public TestNestedType nestedVal;
Expand DownExpand Up@@ -1259,7 +1341,12 @@ public static class TestWildcardPojo {
 }

 public static class TestArrayPojo {
 public String[] values;
 public String[] strings;
 public int[] ints;
 public TestNestedType[] nesteds;
 public int[][] matrix;
 public TestNestedType[][] nestedMatrix;
 public byte[][] byteArrays;
 }

 public static class TestOptionalUrlPojo {
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Jun 9, 2026
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Expand support to arrays to Native type extensions
#1069
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1 change: 1 addition & 0 deletions
extensions/src/main/java/dev/cel/extensions/BUILD.bazel

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -329,6 +329,7 @@ java_library(
 deps = [
 "//checker:checker_builder",
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:invalid_argument",
 "//common/internal:reflection_util",
 "//common/types",
 "//common/types:type_providers",
Expand Down

70 changes: 66 additions & 4 deletions
extensions/src/main/java/dev/cel/extensions/CelNativeTypesExtensions.java

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -28,6 +28,7 @@
import com.google.errorprone.annotations.Immutable;
import dev.cel.checker.CelCheckerBuilder;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.internal.ReflectionUtil;
import dev.cel.common.types.CelType;
import dev.cel.common.types.CelTypeProvider;
Expand All@@ -47,6 +48,7 @@
import dev.cel.runtime.CelRuntimeLibrary;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
Expand DownExpand Up@@ -289,6 +291,15 @@ private static CelType mapJavaTypeToCelType(
 return celType;
 }

 if (type.isArray()) {
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 return ListType.create(
 mapJavaTypeToCelType(componentToken.getRawType(), componentToken.getType(), classMap));
 }

 if (type.isInterface()
 && !List.class.isAssignableFrom(type)
 && !Map.class.isAssignableFrom(type)) {
Expand DownExpand Up@@ -416,6 +427,14 @@ private void discover(Type type) {
 TypeToken<?> token = TypeToken.of(type);
 Class<?> rawType = token.getRawType();

 if (rawType.isArray()) {
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 discover(componentToken.getType());
 return;
 }

 if (List.class.isAssignableFrom(rawType)) {
 discover(ReflectionUtil.resolveGenericParameter(token, List.class, 0));
 return;
Expand DownExpand Up@@ -775,6 +794,9 @@ private static Object getDefaultValue(Class<?> targetType) {
 if (Map.class.isAssignableFrom(targetType)) {
 return ImmutableMap.of();
 }
 if (targetType.isArray()) {
 return Array.newInstance(targetType.getComponentType(), 0);
 }

 try {
 Constructor<?> constructor = targetType.getDeclaredConstructor();
Expand DownExpand Up@@ -822,6 +844,10 @@ public Object toRuntimeValue(Object value) {
 return new PojoStructValue(value, accessors, registry.classToTypeMap.get(clazz));
 }

 if (clazz.isArray() && clazz != byte[].class) {
 return convertArrayToList(value);
 }

 return super.toRuntimeValue(value);
 }

Expand All@@ -844,8 +870,14 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {
 return ((CelByteString) value).toByteArray();
 }

 if (List.class.isAssignableFrom(targetType) && value instanceof List) {
 return convertListToNative((List<?>) value, targetType, genericType);
 if (value instanceof List) {
 List<?> listValue = (List<?>) value;
 if (List.class.isAssignableFrom(targetType)) {
 return convertListToNative(listValue, targetType, genericType);
 }
 if (targetType.isArray()) {
 return convertListToArray(listValue, targetType, genericType);
 }
 }

 if (Map.class.isAssignableFrom(targetType) && value instanceof Map) {
Expand All@@ -857,7 +889,7 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 private List<?> convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type elementType = ReflectionUtil.resolveGenericParameter(token, List.class, 0);
 Class<?> componentType = ReflectionUtil.getRawType(elementType);
Expand DownExpand Up@@ -909,7 +941,7 @@ private Object convertListToNative(List<?> list, Class<?> targetType, Type gener

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 private Map<?, ?> convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type keyType = ReflectionUtil.resolveGenericParameter(token, Map.class, 0);
 Type valueType = ReflectionUtil.resolveGenericParameter(token, Map.class, 1);
Expand DownExpand Up@@ -970,6 +1002,36 @@ private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type gener
 return builder.buildOrThrow();
 }

 private Object convertListToArray(List<?> list, Class<?> targetType, Type genericType) {
 Class<?> componentType = targetType.getComponentType();
 Object array = Array.newInstance(componentType, list.size());
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 Type componentGenericType = componentToken.getType();

 for (int i = 0; i < list.size(); i++) {
 Object element = list.get(i);
 Object converted = toNative(element, componentType, componentGenericType);
 Array.set(array, i, converted);
 }
 return array;
 }

 private ImmutableList<Object> convertArrayToList(Object array) {
 int length = Array.getLength(array);
 ImmutableList.Builder<Object> builder = ImmutableList.builderWithExpectedSize(length);
 for (int i = 0; i < length; i++) {
 Object element = Array.get(array, i);
 if (element == null) {
 throw new CelInvalidArgumentException(String.format("Element at index %d is null.", i));
 }
 builder.add(toRuntimeValue(element));
 }
 return builder.build();
 }

 private Object downcastPrimitives(Object value, Class<?> targetType) {
 Class<?> wrappedTargetType = Primitives.wrap(targetType);
 if (wrappedTargetType == Integer.class && value instanceof Long) {
Expand Down

4 changes: 2 additions & 2 deletions
extensions/src/main/java/dev/cel/extensions/README.md

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1114,14 +1114,14 @@ The type-mapping between Java and CEL is as follows:
| `String` | `string` |
| `java.time.Duration` | `duration` |
| `java.time.Instant` | `timestamp` |
| `java.util.List` | `list` |
| `java.util.List`, `T[]` (except `byte[]`) | `list` |
| `java.util.Map` | `map` |
| `java.util.Optional` | `optional_type` |

### Notes

* This is only supported for the planner runtime (e.g., `CelRuntimeFactory.plannerRuntimeBuilder()`).
* Native Java arrays (except `byte[]`) are not supported. Use `java.util.List` instead.
* Native Java arrays are supported. `byte[]` maps to `bytes`, while other arrays map to `list`.
* Java `enum` properties are not currently supported and will be safely ignored during scanning.
* If there is a name collision with a Protobuf type, the protobuf type will take precedence.
* Instantiating new struct values (e.g., `Account{id: 1234}`) requires the class to have a no-argument constructor (public, protected, package-private, or private).
Expand Down

1 change: 1 addition & 0 deletions
extensions/src/test/java/dev/cel/extensions/BUILD.bazel

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -20,6 +20,7 @@ java_library(
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:divide_by_zero",
 "//common/exceptions:index_out_of_bounds",
 "//common/exceptions:invalid_argument",
 "//common/types",
 "//common/types:type_providers",
 "//common/values",
Expand Down

121 changes: 104 additions & 17 deletions
extensions/src/test/java/dev/cel/extensions/CelNativeTypesExtensionsTest.java

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,7 @@
import dev.cel.common.CelContainer;
import dev.cel.common.CelValidationException;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.types.CelType;
import dev.cel.common.types.ListType;
import dev.cel.common.types.MapType;
Expand DownExpand Up@@ -90,7 +91,8 @@ public final class CelNativeTypesExtensionsTest {
 TestGetterFieldTypeMismatchPojo.class,
 TestAbstractPojo.class,
 TestURLPojo.class,
 PojoWithEnum.class);
 PojoWithEnum.class,
 TestArrayPojo.class);

 private static final Cel CEL =
 CelFactory.plannerCelBuilder()
Expand DownExpand Up@@ -323,10 +325,10 @@ public void nativeTypes_anonymousClass_throwsException() {

 @Test
 public void nativeTypes_createStruct_privateConstructor() throws Exception {
 Object result = eval("TestPrivateConstructorPojo{value:" + " 'hello'}");
 TestPrivateConstructorPojo result =
 (TestPrivateConstructorPojo) eval("TestPrivateConstructorPojo{value:" + " 'hello'}");

 assertThat(result).isInstanceOf(TestPrivateConstructorPojo.class);
 assertThat(((TestPrivateConstructorPojo) result).value).isEqualTo("hello");
 assertThat(result.value).isEqualTo("hello");
 }

 @Test
Expand DownExpand Up@@ -375,10 +377,9 @@ public void nativeTypes_missingNoArgConstructor_throws() throws Exception {

 @Test
 public void nativeTypes_createWithDeepConversion() throws Exception {
 Object result = eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");

 assertThat(result).isInstanceOf(TestDeepConversionPojo.class);
 TestDeepConversionPojo pojo = (TestDeepConversionPojo) result;
 TestDeepConversionPojo pojo =
 (TestDeepConversionPojo)
 eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");
 assertThat(pojo.ints.get(0)).isEqualTo(1);
 assertThat(pojo.floats).containsEntry("a", 1.0f);
 }
Expand All@@ -398,11 +399,92 @@ public void nativeTypes_unsupportedTypeSet_throwsOnRegistration() throws Excepti
 }

 @Test
 public void nativeTypes_arrayType_throwsOnRegistration() throws Exception {
 IllegalArgumentException e =
 public void nativeTypes_arrayType_construction() throws Exception {
 String expr =
 "TestArrayPojo{"
 + " strings: ['a', 'b'],"
 + " ints: [1, 2],"
 + " nesteds: [TestNestedType{value: 'nested'}],"
 + " matrix: [[1, 2], [3, 4]],"
 + " nestedMatrix: [[TestNestedType{value: 'm1'}], [TestNestedType{value: 'm2'}]],"
 + " byteArrays: [b'foo', b'bar']"
 + "}";

 TestArrayPojo pojo = (TestArrayPojo) eval(expr);

 assertThat(pojo.strings).isEqualTo(new String[] {"a", "b"});
 assertThat(pojo.ints).isEqualTo(new int[] {1, 2});
 assertThat(pojo.nesteds).hasLength(1);
 assertThat(pojo.nesteds[0].value).isEqualTo("nested");
 assertThat(pojo.matrix).hasLength(2);
 assertThat(pojo.matrix[0]).isEqualTo(new int[] {1, 2});
 assertThat(pojo.matrix[1]).isEqualTo(new int[] {3, 4});
 assertThat(pojo.nestedMatrix).hasLength(2);
 assertThat(pojo.nestedMatrix[0][0].value).isEqualTo("m1");
 assertThat(pojo.nestedMatrix[1][0].value).isEqualTo("m2");
 assertThat(pojo.byteArrays).hasLength(2);
 assertThat(pojo.byteArrays[0]).isEqualTo("foo".getBytes(UTF_8));
 assertThat(pojo.byteArrays[1]).isEqualTo("bar".getBytes(UTF_8));
 }

 @Test
 public void nativeTypes_arrayType_selection() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 String expr =
 "pojo.strings[1] == 'b'"
 + " && pojo.ints[0] == 1"
 + " && pojo.nesteds[0].value == 'nested'"
 + " && pojo.matrix[1][0] == 3"
 + " && pojo.nestedMatrix[1][0].value == 'm2'"
 + " && pojo.byteArrays[1] == b'bar'";
 CelAbstractSyntaxTree ast = cel.compile(expr).getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", "b"};
 input.ints = new int[] {1, 2};
 TestNestedType nested = new TestNestedType();
 nested.value = "nested";
 input.nesteds = new TestNestedType[] {nested};
 input.matrix = new int[][] {{1, 2}, {3, 4}};
 TestNestedType m1 = new TestNestedType();
 m1.value = "m1";
 TestNestedType m2 = new TestNestedType();
 m2.value = "m2";
 input.nestedMatrix = new TestNestedType[][] {{m1}, {m2}};
 input.byteArrays = new byte[][] {"foo".getBytes(UTF_8), "bar".getBytes(UTF_8)};

 assertThat(program.eval(ImmutableMap.of("pojo", input))).isEqualTo(true);
 }

 @Test
 public void nativeTypes_arrayWithNullElement_throws() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 CelAbstractSyntaxTree ast = cel.compile("pojo.strings").getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", null, "c"};

 CelEvaluationException e =
 assertThrows(
 IllegalArgumentException.class, () -> CelExtensions.nativeTypes(TestArrayPojo.class));
 assertThat(e).hasMessageThat().contains("Unsupported type for property 'values'");
 CelEvaluationException.class, () -> program.eval(ImmutableMap.of("pojo", input)));
 assertThat(e).hasCauseThat().isInstanceOf(CelInvalidArgumentException.class);
 assertThat(e).hasCauseThat().hasMessageThat().contains("Element at index 1 is null.");
 }

 @Test
Expand DownExpand Up@@ -662,10 +744,7 @@ public void nativeTypes_createWithUint_fromUnsignedLong() throws Exception {
 .getAst();
 CelRuntime.Program program = celRuntime.createProgram(ast);

 Object result = program.eval();

 assertThat(result).isInstanceOf(TestAllTypesPublicFieldsPojo.class);
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) result;
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) program.eval();
 assertThat(pojo.uintVal).isEqualTo(UnsignedLong.fromLongBits(42L));
 }

Expand DownExpand Up@@ -782,6 +861,8 @@ public void nativeTypes_nullSafeTraversal() throws Exception {
 assertThat(cel.createProgram(cel.compile("pojo.int64Val").getAst()).eval(vars)).isEqualTo(0L);
 assertThat(cel.createProgram(cel.compile("pojo.nestedVal.value").getAst()).eval(vars))
 .isEqualTo("");
 assertThat(cel.createProgram(cel.compile("size(pojo.arrayVal) == 0").getAst()).eval(vars))
 .isEqualTo(true);
 CelAbstractSyntaxTree abstractPojoAst = cel.compile("pojo.abstractPojo.value").getAst();
 CelRuntime.Program abstractPojoProgram = cel.createProgram(abstractPojoAst);
 CelEvaluationException e =
Expand DownExpand Up@@ -942,6 +1023,7 @@ public String get() {
 public double doubleVal;
 public float floatVal;
 public byte[] bytesVal;
 public String[] arrayVal;
 public Duration durationVal;
 public Instant timestampVal;
 public TestNestedType nestedVal;
Expand DownExpand Up@@ -1259,7 +1341,12 @@ public static class TestWildcardPojo {
 }

 public static class TestArrayPojo {
 public String[] values;
 public String[] strings;
 public int[] ints;
 public TestNestedType[] nesteds;
 public int[][] matrix;
 public TestNestedType[][] nestedMatrix;
 public byte[][] byteArrays;
 }

 public static class TestOptionalUrlPojo {
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Jun 9, 2026
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Expand support to arrays to Native type extensions
#1069
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1 change: 1 addition & 0 deletions
extensions/src/main/java/dev/cel/extensions/BUILD.bazel

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Original file line numberDiff line numberDiff line change
Expand Up@@ -329,6 +329,7 @@ java_library(
 deps = [
 "//checker:checker_builder",
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:invalid_argument",
 "//common/internal:reflection_util",
 "//common/types",
 "//common/types:type_providers",
Expand Down

70 changes: 66 additions & 4 deletions
extensions/src/main/java/dev/cel/extensions/CelNativeTypesExtensions.java

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Original file line numberDiff line numberDiff line change
Expand Up@@ -28,6 +28,7 @@
import com.google.errorprone.annotations.Immutable;
import dev.cel.checker.CelCheckerBuilder;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.internal.ReflectionUtil;
import dev.cel.common.types.CelType;
import dev.cel.common.types.CelTypeProvider;
Expand All@@ -47,6 +48,7 @@
import dev.cel.runtime.CelRuntimeLibrary;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
Expand DownExpand Up@@ -289,6 +291,15 @@ private static CelType mapJavaTypeToCelType(
 return celType;
 }

 if (type.isArray()) {
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 return ListType.create(
 mapJavaTypeToCelType(componentToken.getRawType(), componentToken.getType(), classMap));
 }

 if (type.isInterface()
 && !List.class.isAssignableFrom(type)
 && !Map.class.isAssignableFrom(type)) {
Expand DownExpand Up@@ -416,6 +427,14 @@ private void discover(Type type) {
 TypeToken<?> token = TypeToken.of(type);
 Class<?> rawType = token.getRawType();

 if (rawType.isArray()) {
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 discover(componentToken.getType());
 return;
 }

 if (List.class.isAssignableFrom(rawType)) {
 discover(ReflectionUtil.resolveGenericParameter(token, List.class, 0));
 return;
Expand DownExpand Up@@ -775,6 +794,9 @@ private static Object getDefaultValue(Class<?> targetType) {
 if (Map.class.isAssignableFrom(targetType)) {
 return ImmutableMap.of();
 }
 if (targetType.isArray()) {
 return Array.newInstance(targetType.getComponentType(), 0);
 }

 try {
 Constructor<?> constructor = targetType.getDeclaredConstructor();
Expand DownExpand Up@@ -822,6 +844,10 @@ public Object toRuntimeValue(Object value) {
 return new PojoStructValue(value, accessors, registry.classToTypeMap.get(clazz));
 }

 if (clazz.isArray() && clazz != byte[].class) {
 return convertArrayToList(value);
 }

 return super.toRuntimeValue(value);
 }

Expand All@@ -844,8 +870,14 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {
 return ((CelByteString) value).toByteArray();
 }

 if (List.class.isAssignableFrom(targetType) && value instanceof List) {
 return convertListToNative((List<?>) value, targetType, genericType);
 if (value instanceof List) {
 List<?> listValue = (List<?>) value;
 if (List.class.isAssignableFrom(targetType)) {
 return convertListToNative(listValue, targetType, genericType);
 }
 if (targetType.isArray()) {
 return convertListToArray(listValue, targetType, genericType);
 }
 }

 if (Map.class.isAssignableFrom(targetType) && value instanceof Map) {
Expand All@@ -857,7 +889,7 @@ Object toNative(Object value, Class<?> targetType, Type genericType) {

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 private List<?> convertListToNative(List<?> list, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type elementType = ReflectionUtil.resolveGenericParameter(token, List.class, 0);
 Class<?> componentType = ReflectionUtil.getRawType(elementType);
Expand DownExpand Up@@ -909,7 +941,7 @@ private Object convertListToNative(List<?> list, Class<?> targetType, Type gener

 // Safe reflection collection cast.
 @SuppressWarnings("unchecked")
 private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 private Map<?, ?> convertMapToNative(Map<?, ?> map, Class<?> targetType, Type genericType) {
 TypeToken<?> token = TypeToken.of(genericType);
 Type keyType = ReflectionUtil.resolveGenericParameter(token, Map.class, 0);
 Type valueType = ReflectionUtil.resolveGenericParameter(token, Map.class, 1);
Expand DownExpand Up@@ -970,6 +1002,36 @@ private Object convertMapToNative(Map<?, ?> map, Class<?> targetType, Type gener
 return builder.buildOrThrow();
 }

 private Object convertListToArray(List<?> list, Class<?> targetType, Type genericType) {
 Class<?> componentType = targetType.getComponentType();
 Object array = Array.newInstance(componentType, list.size());
 TypeToken<?> token = TypeToken.of(genericType);
 TypeToken<?> componentToken =
 Preconditions.checkNotNull(
 token.getComponentType(), "Array component type cannot be null");
 Type componentGenericType = componentToken.getType();

 for (int i = 0; i < list.size(); i++) {
 Object element = list.get(i);
 Object converted = toNative(element, componentType, componentGenericType);
 Array.set(array, i, converted);
 }
 return array;
 }

 private ImmutableList<Object> convertArrayToList(Object array) {
 int length = Array.getLength(array);
 ImmutableList.Builder<Object> builder = ImmutableList.builderWithExpectedSize(length);
 for (int i = 0; i < length; i++) {
 Object element = Array.get(array, i);
 if (element == null) {
 throw new CelInvalidArgumentException(String.format("Element at index %d is null.", i));
 }
 builder.add(toRuntimeValue(element));
 }
 return builder.build();
 }

 private Object downcastPrimitives(Object value, Class<?> targetType) {
 Class<?> wrappedTargetType = Primitives.wrap(targetType);
 if (wrappedTargetType == Integer.class && value instanceof Long) {
Expand Down

4 changes: 2 additions & 2 deletions
extensions/src/main/java/dev/cel/extensions/README.md

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Original file line numberDiff line numberDiff line change
Expand Up@@ -1114,14 +1114,14 @@ The type-mapping between Java and CEL is as follows:
| `String` | `string` |
| `java.time.Duration` | `duration` |
| `java.time.Instant` | `timestamp` |
| `java.util.List` | `list` |
| `java.util.List`, `T[]` (except `byte[]`) | `list` |
| `java.util.Map` | `map` |
| `java.util.Optional` | `optional_type` |

### Notes

* This is only supported for the planner runtime (e.g., `CelRuntimeFactory.plannerRuntimeBuilder()`).
* Native Java arrays (except `byte[]`) are not supported. Use `java.util.List` instead.
* Native Java arrays are supported. `byte[]` maps to `bytes`, while other arrays map to `list`.
* Java `enum` properties are not currently supported and will be safely ignored during scanning.
* If there is a name collision with a Protobuf type, the protobuf type will take precedence.
* Instantiating new struct values (e.g., `Account{id: 1234}`) requires the class to have a no-argument constructor (public, protected, package-private, or private).
Expand Down

1 change: 1 addition & 0 deletions
extensions/src/test/java/dev/cel/extensions/BUILD.bazel

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -20,6 +20,7 @@ java_library(
 "//common/exceptions:attribute_not_found",
 "//common/exceptions:divide_by_zero",
 "//common/exceptions:index_out_of_bounds",
 "//common/exceptions:invalid_argument",
 "//common/types",
 "//common/types:type_providers",
 "//common/values",
Expand Down

121 changes: 104 additions & 17 deletions
extensions/src/test/java/dev/cel/extensions/CelNativeTypesExtensionsTest.java

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -30,6 +30,7 @@
import dev.cel.common.CelContainer;
import dev.cel.common.CelValidationException;
import dev.cel.common.exceptions.CelAttributeNotFoundException;
import dev.cel.common.exceptions.CelInvalidArgumentException;
import dev.cel.common.types.CelType;
import dev.cel.common.types.ListType;
import dev.cel.common.types.MapType;
Expand DownExpand Up@@ -90,7 +91,8 @@ public final class CelNativeTypesExtensionsTest {
 TestGetterFieldTypeMismatchPojo.class,
 TestAbstractPojo.class,
 TestURLPojo.class,
 PojoWithEnum.class);
 PojoWithEnum.class,
 TestArrayPojo.class);

 private static final Cel CEL =
 CelFactory.plannerCelBuilder()
Expand DownExpand Up@@ -323,10 +325,10 @@ public void nativeTypes_anonymousClass_throwsException() {

 @Test
 public void nativeTypes_createStruct_privateConstructor() throws Exception {
 Object result = eval("TestPrivateConstructorPojo{value:" + " 'hello'}");
 TestPrivateConstructorPojo result =
 (TestPrivateConstructorPojo) eval("TestPrivateConstructorPojo{value:" + " 'hello'}");

 assertThat(result).isInstanceOf(TestPrivateConstructorPojo.class);
 assertThat(((TestPrivateConstructorPojo) result).value).isEqualTo("hello");
 assertThat(result.value).isEqualTo("hello");
 }

 @Test
Expand DownExpand Up@@ -375,10 +377,9 @@ public void nativeTypes_missingNoArgConstructor_throws() throws Exception {

 @Test
 public void nativeTypes_createWithDeepConversion() throws Exception {
 Object result = eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");

 assertThat(result).isInstanceOf(TestDeepConversionPojo.class);
 TestDeepConversionPojo pojo = (TestDeepConversionPojo) result;
 TestDeepConversionPojo pojo =
 (TestDeepConversionPojo)
 eval("TestDeepConversionPojo{ints: [1, 2], floats: {'a': 1.0, 'b': 2.0}}");
 assertThat(pojo.ints.get(0)).isEqualTo(1);
 assertThat(pojo.floats).containsEntry("a", 1.0f);
 }
Expand All@@ -398,11 +399,92 @@ public void nativeTypes_unsupportedTypeSet_throwsOnRegistration() throws Excepti
 }

 @Test
 public void nativeTypes_arrayType_throwsOnRegistration() throws Exception {
 IllegalArgumentException e =
 public void nativeTypes_arrayType_construction() throws Exception {
 String expr =
 "TestArrayPojo{"
 + " strings: ['a', 'b'],"
 + " ints: [1, 2],"
 + " nesteds: [TestNestedType{value: 'nested'}],"
 + " matrix: [[1, 2], [3, 4]],"
 + " nestedMatrix: [[TestNestedType{value: 'm1'}], [TestNestedType{value: 'm2'}]],"
 + " byteArrays: [b'foo', b'bar']"
 + "}";

 TestArrayPojo pojo = (TestArrayPojo) eval(expr);

 assertThat(pojo.strings).isEqualTo(new String[] {"a", "b"});
 assertThat(pojo.ints).isEqualTo(new int[] {1, 2});
 assertThat(pojo.nesteds).hasLength(1);
 assertThat(pojo.nesteds[0].value).isEqualTo("nested");
 assertThat(pojo.matrix).hasLength(2);
 assertThat(pojo.matrix[0]).isEqualTo(new int[] {1, 2});
 assertThat(pojo.matrix[1]).isEqualTo(new int[] {3, 4});
 assertThat(pojo.nestedMatrix).hasLength(2);
 assertThat(pojo.nestedMatrix[0][0].value).isEqualTo("m1");
 assertThat(pojo.nestedMatrix[1][0].value).isEqualTo("m2");
 assertThat(pojo.byteArrays).hasLength(2);
 assertThat(pojo.byteArrays[0]).isEqualTo("foo".getBytes(UTF_8));
 assertThat(pojo.byteArrays[1]).isEqualTo("bar".getBytes(UTF_8));
 }

 @Test
 public void nativeTypes_arrayType_selection() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 String expr =
 "pojo.strings[1] == 'b'"
 + " && pojo.ints[0] == 1"
 + " && pojo.nesteds[0].value == 'nested'"
 + " && pojo.matrix[1][0] == 3"
 + " && pojo.nestedMatrix[1][0].value == 'm2'"
 + " && pojo.byteArrays[1] == b'bar'";
 CelAbstractSyntaxTree ast = cel.compile(expr).getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", "b"};
 input.ints = new int[] {1, 2};
 TestNestedType nested = new TestNestedType();
 nested.value = "nested";
 input.nesteds = new TestNestedType[] {nested};
 input.matrix = new int[][] {{1, 2}, {3, 4}};
 TestNestedType m1 = new TestNestedType();
 m1.value = "m1";
 TestNestedType m2 = new TestNestedType();
 m2.value = "m2";
 input.nestedMatrix = new TestNestedType[][] {{m1}, {m2}};
 input.byteArrays = new byte[][] {"foo".getBytes(UTF_8), "bar".getBytes(UTF_8)};

 assertThat(program.eval(ImmutableMap.of("pojo", input))).isEqualTo(true);
 }

 @Test
 public void nativeTypes_arrayWithNullElement_throws() throws Exception {
 CelNativeTypesExtensions extensions = CelExtensions.nativeTypes(TestArrayPojo.class);
 Cel cel =
 CelFactory.plannerCelBuilder()
 .setContainer(CelContainer.ofName("dev.cel.extensions.CelNativeTypesExtensionsTest"))
 .addCompilerLibraries(extensions)
 .addRuntimeLibraries(extensions)
 .addVar("pojo", StructTypeReference.create(TestArrayPojo.class.getCanonicalName()))
 .build();
 CelAbstractSyntaxTree ast = cel.compile("pojo.strings").getAst();
 CelRuntime.Program program = cel.createProgram(ast);

 TestArrayPojo input = new TestArrayPojo();
 input.strings = new String[] {"a", null, "c"};

 CelEvaluationException e =
 assertThrows(
 IllegalArgumentException.class, () -> CelExtensions.nativeTypes(TestArrayPojo.class));
 assertThat(e).hasMessageThat().contains("Unsupported type for property 'values'");
 CelEvaluationException.class, () -> program.eval(ImmutableMap.of("pojo", input)));
 assertThat(e).hasCauseThat().isInstanceOf(CelInvalidArgumentException.class);
 assertThat(e).hasCauseThat().hasMessageThat().contains("Element at index 1 is null.");
 }

 @Test
Expand DownExpand Up@@ -662,10 +744,7 @@ public void nativeTypes_createWithUint_fromUnsignedLong() throws Exception {
 .getAst();
 CelRuntime.Program program = celRuntime.createProgram(ast);

 Object result = program.eval();

 assertThat(result).isInstanceOf(TestAllTypesPublicFieldsPojo.class);
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) result;
 TestAllTypesPublicFieldsPojo pojo = (TestAllTypesPublicFieldsPojo) program.eval();
 assertThat(pojo.uintVal).isEqualTo(UnsignedLong.fromLongBits(42L));
 }

Expand DownExpand Up@@ -782,6 +861,8 @@ public void nativeTypes_nullSafeTraversal() throws Exception {
 assertThat(cel.createProgram(cel.compile("pojo.int64Val").getAst()).eval(vars)).isEqualTo(0L);
 assertThat(cel.createProgram(cel.compile("pojo.nestedVal.value").getAst()).eval(vars))
 .isEqualTo("");
 assertThat(cel.createProgram(cel.compile("size(pojo.arrayVal) == 0").getAst()).eval(vars))
 .isEqualTo(true);
 CelAbstractSyntaxTree abstractPojoAst = cel.compile("pojo.abstractPojo.value").getAst();
 CelRuntime.Program abstractPojoProgram = cel.createProgram(abstractPojoAst);
 CelEvaluationException e =
Expand DownExpand Up@@ -942,6 +1023,7 @@ public String get() {
 public double doubleVal;
 public float floatVal;
 public byte[] bytesVal;
 public String[] arrayVal;
 public Duration durationVal;
 public Instant timestampVal;
 public TestNestedType nestedVal;
Expand DownExpand Up@@ -1259,7 +1341,12 @@ public static class TestWildcardPojo {
 }

 public static class TestArrayPojo {
 public String[] values;
 public String[] strings;
 public int[] ints;
 public TestNestedType[] nesteds;
 public int[][] matrix;
 public TestNestedType[][] nestedMatrix;
 public byte[][] byteArrays;
 }

 public static class TestOptionalUrlPojo {
Expand Down
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