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org.apache.bcel.classfile
Class ConstantPool  

java.lang.Object
  org.apache.bcel.classfile.ConstantPool

All Implemented Interfaces:

java.lang.Cloneable, Node, java.io.Serializable

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public class ConstantPool

extends java.lang.Object

implements java.lang.Cloneable, Node, java.io.Serializable

This class represents the constant pool, i.e., a table of constants, of a parsed classfile. It may contain null references, due to the JVM specification that skips an entry after an 8-byte constant (double, long) entry. Those interested in generating constant pools programatically should see ConstantPoolGen.

Version:

$Id: ConstantPool.java 386056 2006-03-15 11:31:56Z tcurdt $

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Field Summary
private  Constant[]	constant_pool
private  int	constant_pool_count

 

Constructor Summary
	ConstantPool(Constant[] constant_pool)
(package private)	ConstantPool(java.io.DataInputStream file)           Read constants from given file stream.

 

Method Summary
void	accept(Visitor v)           Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class.
java.lang.String	constantToString(Constant c)           Resolve constant to a string representation.
java.lang.String	constantToString(int index, byte tag)           Retrieve constant at `index' from constant pool and resolve it to a string representation.
ConstantPool	copy()
void	dump(java.io.DataOutputStream file)           Dump constant pool to file stream in binary format.
private static java.lang.String	escape(java.lang.String str)
Constant	getConstant(int index)           Get constant from constant pool.
Constant	getConstant(int index, byte tag)           Get constant from constant pool and check whether it has the expected type.
Constant[]	getConstantPool()
java.lang.String	getConstantString(int index, byte tag)           Get string from constant pool and bypass the indirection of `ConstantClass' and `ConstantString' objects.
int	getLength()
void	setConstant(int index, Constant constant)
void	setConstantPool(Constant[] constant_pool)
java.lang.String	toString()           Convert this Object to a human-readable String.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

constant_pool_count

private int constant_pool_count

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constant_pool

private Constant[] constant_pool

Constructor Detail

ConstantPool

public ConstantPool(Constant[] constant_pool)

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ConstantPool

ConstantPool(java.io.DataInputStream file)
       throws java.io.IOException,
              ClassFormatException

Read constants from given file stream.

Method Detail

accept

public void accept(Visitor v)

Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class. I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.

Specified by:

accept in interface Node

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constantToString

public java.lang.String constantToString(Constant c)
                                  throws ClassFormatException

Resolve constant to a string representation.

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escape

private static final java.lang.String escape(java.lang.String str)

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constantToString

public java.lang.String constantToString(int index,
                                         byte tag)
                                  throws ClassFormatException

Retrieve constant at `index' from constant pool and resolve it to a string representation.

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dump

public void dump(java.io.DataOutputStream file)
          throws java.io.IOException

Dump constant pool to file stream in binary format.

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getConstant

public Constant getConstant(int index)

Get constant from constant pool.

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getConstant

public Constant getConstant(int index,
                            byte tag)
                     throws ClassFormatException

Get constant from constant pool and check whether it has the expected type.

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getConstantPool

public Constant[] getConstantPool()

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getConstantString

public java.lang.String getConstantString(int index,
                                          byte tag)
                                   throws ClassFormatException

Get string from constant pool and bypass the indirection of `ConstantClass' and `ConstantString' objects. I.e. these classes have an index field that points to another entry of the constant pool of type `ConstantUtf8' which contains the real data.

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getLength

public int getLength()

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setConstant

public void setConstant(int index,
                        Constant constant)

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setConstantPool

public void setConstantPool(Constant[] constant_pool)

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toString

public java.lang.String toString()

Description copied from class: java.lang.Object

Convert this Object to a human-readable String. There are no limits placed on how long this String should be or what it should contain. We suggest you make it as intuitive as possible to be able to place it into System.out.println() 55 and such.

It is typical, but not required, to ensure that this method never completes abruptly with a java.lang.RuntimeException.

This method will be called when performing string concatenation with this object. If the result is null, string concatenation will instead use "null".

The default implementation returns getClass().getName() + "@" + Integer.toHexString(hashCode()).

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copy

public ConstantPool copy()

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