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## org.apache.bcel.generic
Class ConstantPoolGen

    java.lang.Object
      |
      +--org.apache.bcel.generic.ConstantPoolGen

All Implemented Interfaces:
  java.io.Serializable

public class ConstantPoolGen
extends java.lang.Object
implements java.io.Serializable

This class is used to build up a constant pool. The user adds constants via `addXXX' methods, `addString', `addClass', etc.. These methods return an index into the constant pool. Finally, `getFinalConstantPool()' returns the constant pool built up. Intermediate versions of the constant pool can be obtained with `getConstantPool()'. A constant pool has capacity for Constants.MAX_SHORT entries. Note that the first (0) is used by the JVM and that Double and Long constants need two slots.

Version:
  $Id: ConstantPoolGen.java,v 1.4 2002/12/08 16:04:37 mdahm Exp $
Author:
  M. Dahm
See Also:
  `Constant`, Serialized Form

Field Summary
`protected Constant[]` | `constants`
`protected int` | `index`
`protected int` | `size`

Constructor Summary
`ConstantPoolGen()` Create empty constant pool.
`ConstantPoolGen(Constant[] cs)` Initialize with given array of constants.
`ConstantPoolGen(ConstantPool cp)` Initialize with given constant pool.

Method Summary
`int` | `addArrayClass(ArrayType type)` Add a reference to an array class (e.g.
`int` | `addClass(ObjectType type)` Add a new Class reference to the ConstantPool for a given type.
`int` | `addClass(java.lang.String str)` Add a new Class reference to the ConstantPool, if it is not already in there.
`int` | `addConstant(Constant c, ConstantPoolGen cp)` Import constant from another ConstantPool and return new index.
`int` | `addDouble(double n)` Add a new double constant to the ConstantPool, if it is not already in there.
`int` | `addFieldref(java.lang.String class_name, java.lang.String field_name, java.lang.String signature)` Add a new Fieldref constant to the ConstantPool, if it is not already in there.
`int` | `addFloat(float n)` Add a new Float constant to the ConstantPool, if it is not already in there.
`int` | `addInteger(int n)` Add a new Integer constant to the ConstantPool, if it is not already in there.
`int` | `addInterfaceMethodref(MethodGen method)`
`int` | `addInterfaceMethodref(java.lang.String class_name, java.lang.String method_name, java.lang.String signature)` Add a new InterfaceMethodref constant to the ConstantPool, if it is not already in there.
`int` | `addLong(long n)` Add a new long constant to the ConstantPool, if it is not already in there.
`int` | `addMethodref(MethodGen method)`
`int` | `addMethodref(java.lang.String class_name, java.lang.String method_name, java.lang.String signature)` Add a new Methodref constant to the ConstantPool, if it is not already in there.
`int` | `addNameAndType(java.lang.String name, java.lang.String signature)` Add a new NameAndType constant to the ConstantPool if it is not already in there.
`int` | `addString(java.lang.String str)` Add a new String constant to the ConstantPool, if it is not already in there.
`int` | `addUtf8(java.lang.String n)` Add a new Utf8 constant to the ConstantPool, if it is not already in there.
`protected void` | `adjustSize()` Resize internal array of constants.
`Constant` | `getConstant(int i)`
`ConstantPool` | `getConstantPool()`
`ConstantPool` | `getFinalConstantPool()`
`int` | `getSize()`
`int` | `lookupClass(java.lang.String str)` Look for ConstantClass in ConstantPool named `str'.
`int` | `lookupDouble(double n)` Look for ConstantDouble in ConstantPool.
`int` | `lookupFieldref(java.lang.String class_name, java.lang.String field_name, java.lang.String signature)` Look for ConstantFieldref in ConstantPool.
`int` | `lookupFloat(float n)` Look for ConstantFloat in ConstantPool.
`int` | `lookupInteger(int n)` Look for ConstantInteger in ConstantPool.
`int` | `lookupInterfaceMethodref(MethodGen method)`
`int` | `lookupInterfaceMethodref(java.lang.String class_name, java.lang.String method_name, java.lang.String signature)` Look for ConstantInterfaceMethodref in ConstantPool.
`int` | `lookupLong(long n)` Look for ConstantLong in ConstantPool.
`int` | `lookupMethodref(MethodGen method)`
`int` | `lookupMethodref(java.lang.String class_name, java.lang.String method_name, java.lang.String signature)` Look for ConstantMethodref in ConstantPool.
`int` | `lookupNameAndType(java.lang.String name, java.lang.String signature)` Look for ConstantNameAndType in ConstantPool.
`int` | `lookupString(java.lang.String str)` Look for ConstantString in ConstantPool containing String `str'.
`int` | `lookupUtf8(java.lang.String n)` Look for ConstantUtf8 in ConstantPool.
`void` | `setConstant(int i, Constant c)` Use with care!
`java.lang.String` | `toString()`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### size

    protected int size

### constants

    protected Constant[] constants

### index

    protected int index

Constructor Detail

### ConstantPoolGen

    public ConstantPoolGen(Constant[] cs)

  Initialize with given array of constants.

### ConstantPoolGen

    public ConstantPoolGen(ConstantPool cp)

  Initialize with given constant pool.

### ConstantPoolGen

    public ConstantPoolGen()

  Create empty constant pool.

Method Detail

### adjustSize

    protected void adjustSize()

  Resize internal array of constants.

### lookupString

    public int lookupString(java.lang.String str)

  Look for ConstantString in ConstantPool containing String `str'.

  Parameters:
    `str` - String to search for
  Returns:
    index on success, -1 otherwise

### addString

    public int addString(java.lang.String str)

  Add a new String constant to the ConstantPool, if it is not already in there.

  Parameters:
    `str` - String to add
  Returns:
    index of entry

### lookupClass

    public int lookupClass(java.lang.String str)

  Look for ConstantClass in ConstantPool named `str'.

  Parameters:
    `str` - String to search for
  Returns:
    index on success, -1 otherwise

### addClass

    public int addClass(java.lang.String str)

  Add a new Class reference to the ConstantPool, if it is not already in there.

  Parameters:
    `str` - Class to add
  Returns:
    index of entry

### addClass

    public int addClass(ObjectType type)

  Add a new Class reference to the ConstantPool for a given type.

  Returns:
    index of entry

### addArrayClass

    public int addArrayClass(ArrayType type)

  Add a reference to an array class (e.g. String[][]) as needed by MULTIANEWARRAY instruction, e.g. to the ConstantPool.

  Parameters:
    `type` - type of array class
  Returns:
    index of entry

### lookupInteger

    public int lookupInteger(int n)

  Look for ConstantInteger in ConstantPool.

  Parameters:
    `n` - integer number to look for
  Returns:
    index on success, -1 otherwise

### addInteger

    public int addInteger(int n)

  Add a new Integer constant to the ConstantPool, if it is not already in there.

  Parameters:
    `n` - integer number to add
  Returns:
    index of entry

### lookupFloat

    public int lookupFloat(float n)

  Look for ConstantFloat in ConstantPool.

  Parameters:
    `n` - Float number to look for
  Returns:
    index on success, -1 otherwise

### addFloat

    public int addFloat(float n)

  Add a new Float constant to the ConstantPool, if it is not already in there.

  Parameters:
    `n` - Float number to add
  Returns:
    index of entry

### lookupUtf8

    public int lookupUtf8(java.lang.String n)

  Look for ConstantUtf8 in ConstantPool.

  Parameters:
    `n` - Utf8 string to look for
  Returns:
    index on success, -1 otherwise

### addUtf8

    public int addUtf8(java.lang.String n)

  Add a new Utf8 constant to the ConstantPool, if it is not already in there.

  Parameters:
    `n` - Utf8 string to add
  Returns:
    index of entry

### lookupLong

    public int lookupLong(long n)

  Look for ConstantLong in ConstantPool.

  Parameters:
    `n` - Long number to look for
  Returns:
    index on success, -1 otherwise

### addLong

    public int addLong(long n)

  Add a new long constant to the ConstantPool, if it is not already in there.

  Parameters:
    `n` - Long number to add
  Returns:
    index of entry

### lookupDouble

    public int lookupDouble(double n)

  Look for ConstantDouble in ConstantPool.

  Parameters:
    `n` - Double number to look for
  Returns:
    index on success, -1 otherwise

### addDouble

    public int addDouble(double n)

  Add a new double constant to the ConstantPool, if it is not already in there.

  Parameters:
    `n` - Double number to add
  Returns:
    index of entry

### lookupNameAndType

    public int lookupNameAndType(java.lang.String name,
                                 java.lang.String signature)

  Look for ConstantNameAndType in ConstantPool.

  Parameters:
    `name` - of variable/method
    `signature` - of variable/method
  Returns:
    index on success, -1 otherwise

### addNameAndType

    public int addNameAndType(java.lang.String name,
                              java.lang.String signature)

  Add a new NameAndType constant to the ConstantPool if it is not already in there.

  Returns:
    index of entry

### lookupMethodref

    public int lookupMethodref(java.lang.String class_name,
                               java.lang.String method_name,
                               java.lang.String signature)

  Look for ConstantMethodref in ConstantPool.

  Parameters:
    `class_name` - Where to find method
    `method_name` - Guess what
    `signature` - return and argument types
  Returns:
    index on success, -1 otherwise

### lookupMethodref

    public int lookupMethodref(MethodGen method)

### addMethodref

    public int addMethodref(java.lang.String class_name,
                            java.lang.String method_name,
                            java.lang.String signature)

  Add a new Methodref constant to the ConstantPool, if it is not already in there.

  Returns:
    index of entry

### addMethodref

    public int addMethodref(MethodGen method)

### lookupInterfaceMethodref

    public int lookupInterfaceMethodref(java.lang.String class_name,
                                        java.lang.String method_name,
                                        java.lang.String signature)

  Look for ConstantInterfaceMethodref in ConstantPool.

  Parameters:
    `class_name` - Where to find method
    `method_name` - Guess what
    `signature` - return and argument types
  Returns:
    index on success, -1 otherwise

### lookupInterfaceMethodref

    public int lookupInterfaceMethodref(MethodGen method)

### addInterfaceMethodref

    public int addInterfaceMethodref(java.lang.String class_name,
                                     java.lang.String method_name,
                                     java.lang.String signature)

  Add a new InterfaceMethodref constant to the ConstantPool, if it is not already in there.

  Returns:
    index of entry

### addInterfaceMethodref

    public int addInterfaceMethodref(MethodGen method)

### lookupFieldref

    public int lookupFieldref(java.lang.String class_name,
                              java.lang.String field_name,
                              java.lang.String signature)

  Look for ConstantFieldref in ConstantPool.

  Parameters:
    `class_name` - Where to find method
    `field_name` - Guess what
    `signature` - return and argument types
  Returns:
    index on success, -1 otherwise

### addFieldref

    public int addFieldref(java.lang.String class_name,
                           java.lang.String field_name,
                           java.lang.String signature)

  Add a new Fieldref constant to the ConstantPool, if it is not already in there.

  Returns:
    index of entry

### getConstant

    public Constant getConstant(int i)

  Parameters:
    `i` - index in constant pool
  Returns:
    constant pool entry at index i

### setConstant

    public void setConstant(int i,
                            Constant c)

  Use with care!

  Parameters:
    `i` - index in constant pool
    `c` - new constant pool entry at index i

### getConstantPool

    public ConstantPool getConstantPool()

  Returns:
    intermediate constant pool

### getSize

    public int getSize()

  Returns:
    current size of constant pool

### getFinalConstantPool

    public ConstantPool getFinalConstantPool()

  Returns:
    constant pool with proper length

### toString

    public java.lang.String toString()

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    String representation.

### addConstant

    public int addConstant(Constant c,
                           ConstantPoolGen cp)

  Import constant from another ConstantPool and return new index.

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