org.apache.bcel.classfile

Class Attribute

java.lang.Object

org.apache.bcel.classfile.Attribute

All Implemented Interfaces:

Cloneable, Node

Direct Known Subclasses:

AnnotationDefault, Annotations, BootstrapMethods, Code, ConstantValue, Deprecated, EnclosingMethod, ExceptionTable, InnerClasses, LineNumberTable, LocalVariableTable, LocalVariableTypeTable, MethodParameters, ParameterAnnotations, PMGClass, Signature, SourceFile, StackMap, Synthetic, Unknown

public abstract class Attribute
extends Object
implements Cloneable, Node

Abstract super class for Attribute objects. Currently the ConstantValue, SourceFile, Code, Exceptiontable, LineNumberTable, LocalVariableTable, InnerClasses and Synthetic attributes are supported. The Unknown attribute stands for non-standard-attributes.

Version:

$Id: Attribute.java 1806724 2017-08-30 19:22:35Z britter $

See Also:

ConstantValue, SourceFile, Code, Unknown, ExceptionTable, LineNumberTable, LocalVariableTable, InnerClasses, Synthetic, Deprecated, Signature

Field Summary

Fields

Modifier and Type	Field and Description
protected ConstantPool	constant_pool Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter
protected int	length Deprecated. (since 6.0) (since 6.0) will be made private; do not access directly, use getter/setter
protected int	name_index Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter
protected byte	tag Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Attribute(byte tag, int name_index, int length, ConstantPool constant_pool)

Method Summary

Modifier and Type	Method and Description
abstract void	accept(Visitor v) Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class.
static void	addAttributeReader(String name, AttributeReader r) Deprecated. (6.0) Use addAttributeReader(String, UnknownAttributeReader) instead
static void	addAttributeReader(String name, UnknownAttributeReader r) Add an Attribute reader capable of parsing (user-defined) attributes named "name".
Object	clone() Use copy() if you want to have a deep copy(), i.e., with all references copied correctly.
abstract Attribute	copy(ConstantPool _constant_pool)
void	dump(DataOutputStream file) Dump attribute to file stream in binary format.
ConstantPool	getConstantPool()
int	getLength()
String	getName()
int	getNameIndex()
byte	getTag()
static Attribute	readAttribute(DataInput file, ConstantPool constant_pool) Class method reads one attribute from the input data stream.
static Attribute	readAttribute(DataInputStream file, ConstantPool constant_pool) Class method reads one attribute from the input data stream.
static void	removeAttributeReader(String name) Remove attribute reader
void	setConstantPool(ConstantPool constant_pool)
void	setLength(int length)
void	setNameIndex(int name_index)
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

name_index

@Deprecated
protected int name_index

Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter

length

@Deprecated
protected int length

Deprecated. (since 6.0) (since 6.0) will be made private; do not access directly, use getter/setter

tag

@Deprecated
protected byte tag

Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter

constant_pool

@Deprecated
protected ConstantPool constant_pool

Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter

Constructor Detail

Attribute

protected Attribute(byte tag,
                    int name_index,
                    int length,
                    ConstantPool constant_pool)

Method Detail

accept

public abstract 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

Parameters:

v - Visitor object

dump

public void dump(DataOutputStream file)
          throws IOException

Dump attribute to file stream in binary format.

Parameters:

file - Output file stream

Throws:

IOException

addAttributeReader

@Deprecated
public static void addAttributeReader(String name,
                                                   AttributeReader r)

Deprecated. (6.0) Use addAttributeReader(String, UnknownAttributeReader) instead

Add an Attribute reader capable of parsing (user-defined) attributes named "name". You should not add readers for the standard attributes such as "LineNumberTable", because those are handled internally.

Parameters:

name - the name of the attribute as stored in the class file

r - the reader object

addAttributeReader

public static void addAttributeReader(String name,
                                      UnknownAttributeReader r)

Add an Attribute reader capable of parsing (user-defined) attributes named "name". You should not add readers for the standard attributes such as "LineNumberTable", because those are handled internally.

Parameters:

name - the name of the attribute as stored in the class file

r - the reader object

removeAttributeReader

public static void removeAttributeReader(String name)

Remove attribute reader

Parameters:

name - the name of the attribute as stored in the class file

readAttribute

public static Attribute readAttribute(DataInputStream file,
                                      ConstantPool constant_pool)
                               throws IOException,
                                      ClassFormatException

Class method reads one attribute from the input data stream. This method must not be accessible from the outside. It is called by the Field and Method constructor methods.

Parameters:

file - Input stream

constant_pool - Array of constants

Returns:

Attribute

Throws:

IOException

ClassFormatException

See Also:

Field, Method

readAttribute

public static Attribute readAttribute(DataInput file,
                                      ConstantPool constant_pool)
                               throws IOException,
                                      ClassFormatException

Class method reads one attribute from the input data stream. This method must not be accessible from the outside. It is called by the Field and Method constructor methods.

Parameters:

file - Input stream

constant_pool - Array of constants

Returns:

Attribute

Throws:

IOException

ClassFormatException

Since:

6.0

See Also:

Field, Method

getName

public String getName()

Returns:

Name of attribute

Since:

6.0

getLength

public final int getLength()

Returns:

Length of attribute field in bytes.

setLength

public final void setLength(int length)

Parameters:

length - length in bytes.

setNameIndex

public final void setNameIndex(int name_index)

Parameters:

name_index - of attribute.

getNameIndex

public final int getNameIndex()

Returns:

Name index in constant pool of attribute name.

getTag

public final byte getTag()

Returns:

Tag of attribute, i.e., its type. Value may not be altered, thus there is no setTag() method.

getConstantPool

public final ConstantPool getConstantPool()

Returns:

Constant pool used by this object.

See Also:

ConstantPool

setConstantPool

public final void setConstantPool(ConstantPool constant_pool)

Parameters:

constant_pool - Constant pool to be used for this object.

See Also:

ConstantPool

clone

public Object clone()

Use copy() if you want to have a deep copy(), i.e., with all references copied correctly.

Overrides:

clone in class Object

Returns:

shallow copy of this attribute

copy

public abstract Attribute copy(ConstantPool _constant_pool)

Returns:

deep copy of this attribute

toString

public String toString()

Overrides:

toString in class Object

Returns:

attribute name.