EDU.purdue.cs.bloat.editor

Class ConstantPool

java.lang.Object

EDU.purdue.cs.bloat.editor.ConstantPool

public class ConstantPool
extends java.lang.Object

ConstantPool models constants in the constant pool. Recall that the reflection mechanism represents constants as a tag and a value. ConstantPool consists of an array of reflect.Constants that are resolved into their appropriate value (e.g. Type, NameAndType, MemberRef, etc.) as they are needed.

See Also:

Constant

Constructor Summary

Constructors

Constructor and Description
ConstantPool() Creates a new, empty ConstantPool
ConstantPool(Constant[] c) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
int	addConstant(int tag, java.lang.Object value) Add a constant to the constant pool.
java.lang.Object	constantAt(int idx) Obtain the resolved value of a constant at given index in the constant pool.
int	constantIndex(int tag, java.lang.Object value) Get the index of the constant with the given tag and value.
Constant[]	constants() Get an array of the constants in the pool.
int	constantTag(int index) Get the tag of a constant.
int	getClassIndex(java.lang.Class c) Returns the index of the constant pool entry for the given class
int	getClassIndex(Type type) Returns the index of the constant pool entry for the given class.
java.util.List	getConstantsList() Returns an unmodifiable List of constants in this constant pool.
int	getDoubleIndex(java.lang.Double d) Returns the index of the constant pool entry for the given double
int	getFloatIndex(java.lang.Float f) Returns the index of the constant pool entry for the given float
int	getIntegerIndex(java.lang.Integer i) Returns the index of the constant pool entry for the given integer
int	getLongIndex(java.lang.Long l) Returns the index of the constant pool entry for the given long
int	getMemberRefIndex(MemberRef ref) Returns the index of the constant pool entry for the given MemberRef
int	getNameAndTypeIndex(NameAndType nat) Returns the index of the constant pool entry for the given NameAndType
int	getStringIndex(java.lang.String s) Returns the index of the constant pool entry for the given String
int	getTypeIndex(Type type) Returns the index of the constant pool entry for the given Type
int	getUTF8Index(java.lang.String s) Returns the index of the constant pool entry for the given UTF8 string
int	numConstants()

Methods inherited from class java.lang.Object

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

Constructor Detail

ConstantPool

public ConstantPool(Constant[] c)

Constructor. Resolve the constants in the constant pool, converting from the index-based representation of the class file to a more amenable external representation.

Parameters:

c - An array of Constant.

ConstantPool

public ConstantPool()

Creates a new, empty ConstantPool

Method Detail

constantAt

public java.lang.Object constantAt(int idx)

Obtain the resolved value of a constant at given index in the constant pool.

Parameters:

idx - Index into the constant pool.

Returns:

The value of the constant at index.

numConstants

public int numConstants()

constantTag

public int constantTag(int index)

Get the tag of a constant.

Parameters:

index - Index into the constant pool.

Returns:

The tag of the constant at index, or Constant.UTF8.

constantIndex

public int constantIndex(int tag,
                java.lang.Object value)

Get the index of the constant with the given tag and value.

Parameters:

tag - The constant's tag (for example, Constant.UTF8).

value - The constant's value (for example, a String).

Returns:

The index of the constant.

getClassIndex

public int getClassIndex(java.lang.Class c)

Returns the index of the constant pool entry for the given class

getIntegerIndex

public int getIntegerIndex(java.lang.Integer i)

Returns the index of the constant pool entry for the given integer

getFloatIndex

public int getFloatIndex(java.lang.Float f)

Returns the index of the constant pool entry for the given float

getLongIndex

public int getLongIndex(java.lang.Long l)

Returns the index of the constant pool entry for the given long

getDoubleIndex

public int getDoubleIndex(java.lang.Double d)

Returns the index of the constant pool entry for the given double

getClassIndex

public int getClassIndex(Type type)

Returns the index of the constant pool entry for the given class.

getTypeIndex

public int getTypeIndex(Type type)

Returns the index of the constant pool entry for the given Type

getStringIndex

public int getStringIndex(java.lang.String s)

Returns the index of the constant pool entry for the given String

getMemberRefIndex

public int getMemberRefIndex(MemberRef ref)

Returns the index of the constant pool entry for the given MemberRef

getNameAndTypeIndex

public int getNameAndTypeIndex(NameAndType nat)

Returns the index of the constant pool entry for the given NameAndType

getUTF8Index

public int getUTF8Index(java.lang.String s)

Returns the index of the constant pool entry for the given UTF8 string

addConstant

public int addConstant(int tag,
              java.lang.Object value)

Add a constant to the constant pool. Will not add the same constant twice.

Parameters:

tag - The constant's tag (for example, Constant.UTF8).

value - The constant's value (for example, a String).

Returns:

The index of the constant.

constants

public Constant[] constants()

Get an array of the constants in the pool.

Returns:

An array of the constants in the pool.

getConstantsList

public java.util.List getConstantsList()

Returns an unmodifiable List of constants in this constant pool.