com.vladium.jcd.cls.attribute

Class ConstantValueAttribute_info

java.lang.Object

com.vladium.jcd.cls.attribute.Attribute_info

com.vladium.jcd.cls.attribute.ConstantValueAttribute_info

All Implemented Interfaces:

IClassFormatOutput, java.lang.Cloneable

public final class ConstantValueAttribute_info
extends Attribute_info

The ConstantValue attribute is a fixed-length attribute used in the attributes table of the Field_info structures. A ConstantValue attribute represents the value of a constant field that must be (explicitly or implicitly) static; that is, the ACC_STATIC bit in the flags item of the Field_info structure must be set. The field is not required to be final. There can be no more than one ConstantValue attribute in the attributes table of a given Field_info structure. The constant field represented by the Field_info structure is assigned the value referenced by its ConstantValue attribute as part of its initialization.

The ConstantValue attribute has the format

  ConstantValue_attribute {
          u2 attribute_name_index;
          u4 attribute_length;
          u2 constantvalue_index;
  }
 

The value of the constantvalue_index item must be a valid index into the constant pool table. The constant pool entry at that index must give the constant value represented by this attribute.

The constant pool entry must be of a type appropriate to the field, as shown below:

Field Type	Entry Type
long	CONSTANT_Long
float	CONSTANT_Float
double	CONSTANT_Double
int, short, char, byte, boolean	CONSTANT_Integer
java.lang.String	CONSTANT_String

Author:

(C) 2001, Vlad Roubtsov

Field Summary

Fields

Modifier and Type	Field and Description
private static boolean	DEBUG
int	m_value_index

Fields inherited from class com.vladium.jcd.cls.attribute.Attribute_info

ATTRIBUTE_BRIDGE, ATTRIBUTE_CODE, ATTRIBUTE_CONSTANT_VALUE, ATTRIBUTE_EXCEPTIONS, ATTRIBUTE_INNERCLASSES, ATTRIBUTE_LINE_NUMBER_TABLE, ATTRIBUTE_SOURCEFILE, ATTRIBUTE_SYNTHETIC, m_attribute_length, m_name_index

Constructor Summary

Constructors

Constructor and Description
ConstantValueAttribute_info(int attribute_name_index, int value_index)
ConstantValueAttribute_info(int attribute_name_index, long attribute_length, UDataInputStream bytes)

Method Summary

Methods

Modifier and Type	Method and Description
void	accept(IAttributeVisitor visitor, java.lang.Object ctx)
java.lang.Object	clone() Performs a deep copy.
CONSTANT_literal_info	getValue(ClassDef cls)
long	length() Returns the total length of this attribute when converted to .class format [including the 6-byte header]
java.lang.String	toString()
void	writeInClassFormat(UDataOutputStream out)

Methods inherited from class com.vladium.jcd.cls.attribute.Attribute_info

getName, new_Attribute_info

Methods inherited from class java.lang.Object

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

Field Detail

m_value_index

public int m_value_index

DEBUG

private static final boolean DEBUG

See Also:

Constant Field Values

Constructor Detail

ConstantValueAttribute_info

public ConstantValueAttribute_info(int attribute_name_index,
                           int value_index)

ConstantValueAttribute_info

ConstantValueAttribute_info(int attribute_name_index,
                           long attribute_length,
                           UDataInputStream bytes)
                      throws java.io.IOException

Throws:

java.io.IOException

Method Detail

getValue

public CONSTANT_literal_info getValue(ClassDef cls)

length

public long length()

Description copied from class: Attribute_info

Returns the total length of this attribute when converted to .class format [including the 6-byte header]

Specified by:

length in class Attribute_info

accept

public void accept(IAttributeVisitor visitor,
          java.lang.Object ctx)

Specified by:

accept in class Attribute_info

toString

public java.lang.String toString()

Specified by:

toString in class Attribute_info

clone

public java.lang.Object clone()

Performs a deep copy.

Overrides:

clone in class Attribute_info

writeInClassFormat

public void writeInClassFormat(UDataOutputStream out)
                        throws java.io.IOException

Specified by:

writeInClassFormat in interface IClassFormatOutput

Overrides:

writeInClassFormat in class Attribute_info

Throws:

java.io.IOException