IntField.java

package simpledb;

import java.io.*;

/**
 * Instance of Field that stores a single integer.
 */
public class IntField implements Field {
 private int value;

 public int getValue() {
 return value;
 }

 /**
 * Constructor.
 *
 * @param i The value of this field.
 */
 public IntField(int i) {
 value = i;
 }

 public String toString() {
 return Integer.toString(value);
 }

 public int hashCode() {
 return value;
 }

 public boolean equals(Object field) {
 return ((IntField) field).value == value;
 }

 public void serialize(DataOutputStream dos) throws IOException {
 dos.writeInt(value);
 }

 /**
 * Compare the specified field to the value of this Field.
 * Return semantics are as specified by Field.compare
 *
 * @throws IllegalCastException if val is not an IntField
 * @see Field#compare
 */
 public boolean compare(Predicate.Op op, Field val) {

 IntField iVal = (IntField) val;

 switch (op) {
 case EQUALS:
 return value == iVal.value;
 case NOT_EQUALS:
 return value != iVal.value;

 case GREATER_THAN:
 return value > iVal.value;

 case GREATER_THAN_OR_EQ:
 return value >= iVal.value;

 case LESS_THAN:
 return value < iVal.value;

 case LESS_THAN_OR_EQ:
 return value <= iVal.value;

 case LIKE:
 return value == iVal.value;
 }

 return false;
 }

 /**
 * Return the Type of this field.
 * @return Type.INT_TYPE
 */
	public Type getType() {
		return Type.INT_TYPE;
	}
}