SimpleDB/SimpleDb.java at master · SeanLachhander/SimpleDB · GitHub

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packagesimpledb;
importjava.util.*;
importjava.io.*;

publicclassSimpleDb {
publicstaticvoidmain (Stringargs[])
throwsDbException, TransactionAbortedException, IOException {
// convert a file
if(args[0].equals("convert")) {
try {
if (args.length == 3) {
HeapFileEncoder.convert(newFile(args[1]),
newFile(args[1].replaceAll(".txt", ".dat")),
BufferPool.PAGE_SIZE,
Integer.parseInt(args[2]));
 }
elseif (args.length == 4) {
ArrayList<Type> ts = newArrayList<Type>();
String[] typeStringAr = args[3].split(",");
for (Strings: typeStringAr) {
if (s.toLowerCase().equals("int"))
ts.add(Type.INT_TYPE);
elseif (s.toLowerCase().equals("string"))
ts.add(Type.STRING_TYPE);
else {
System.out.println("Unknown type " + s);
return;
 }
 }
HeapFileEncoder.convert(newFile(args[1]),
newFile(args[1].replaceAll(".txt", ".dat")),
BufferPool.PAGE_SIZE,
Integer.parseInt(args[2]), ts.toArray(newType[0]));

 } else {
System.out.println("Unexpected number of arguments to convert ");
 }
 } catch (IOExceptione) {
thrownewRuntimeException(e);
 }
 } elseif (args[0].equals("print")) {
FiletableFile = newFile(args[1]);
intcolumns = Integer.parseInt(args[2]);
DbFiletable = Utility.openHeapFile(columns, tableFile);
TransactionIdtid = newTransactionId();
DbFileIteratorit = table.iterator(tid);

if(null == it){
System.out.println("Error: method HeapFile.iterator(TransactionId tid) not yet implemented!");
 } else {
it.open();
while (it.hasNext()) {
Tuplet = it.next();
System.out.println(t);
 }
it.close();
 }
 }
elseif (args[0].equals("parser")) {
// Strip the first argument and call the parser
String[] newargs = newString[args.length-1];
for (inti = 1; i < args.length; ++i) {
newargs[i-1] = args[i];
 }

try {
//dynamically load Parser -- if it doesn't exist, print error message
Class<?> c = Class.forName("simpledb.Parser");
Class<?> s = String[].class;

java.lang.reflect.Methodm = c.getMethod("main", s);
m.invoke(null, (java.lang.Object)newargs);
 } catch (Exceptione) {
System.out.println("Class Parser not found -- perhaps you are trying to run the parser as a part of assignment1?");
 }

 }
else {
System.err.println("Unknown command: " + args[0]);
System.exit(1);
 }
 }

}