org.jace.parser

Class ConstantPool

java.lang.Object

org.jace.parser.ConstantPool

public class ConstantPool
extends Object

Represents a class file's constant pool.

Author:

Toby Reyelts

Constructor Summary

Constructors

Constructor and Description
ConstantPool()

Method Summary

Methods

Modifier and Type	Method and Description
void	addConstant(Constant constant) Adds a new Constant to the end of the ConstantPool.
int	addUTF8(String constant) Searches the constant pool for the UTF8Constant that matches constant.
Constant	getConstant(int index) Returns the constant at the specified index.
Constant	getConstantAt(int index) Retrieve the Constant at the specified index .
int	getNumEntries()
int	getSize() Returns the number of constants in the pool.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ConstantPool

public ConstantPool()

Method Detail

addUTF8

public int addUTF8(String constant)

Searches the constant pool for the UTF8Constant that matches constant. If constant can be found, it returns the constant pool index for the UTF8Constant. If constant can't be found, it creates a new UTF8Constant, adds it to the pool, and returns the index for that new UTF8Constant.

Parameters:

constant - the UTF8 constant name

Returns:

the index of the constant

addConstant

public void addConstant(Constant constant)

Adds a new Constant to the end of the ConstantPool.

Parameters:

constant - the constant

getConstantAt

public Constant getConstantAt(int index)

Retrieve the Constant at the specified index .

Parameters:

index - The index of the Constant. This value must be greater than 0. Some double-sized Constants take up two indices.

Returns:

the Constant at index are null if index is 0, points to the middle of a Constant, or is beyond the size of the ConstantPool.

getConstant

public Constant getConstant(int index)

Returns the constant at the specified index.

Parameters:

index - the index to look up

Returns:

the Constant at the index

getSize

public int getSize()

Returns the number of constants in the pool.

Returns:

the number of constants in the pool

getNumEntries

public int getNumEntries()

Returns:

a non-negative size. Note that the number of entries in the pool is either equal to or larger than the actual number of Constants in the pool.