Package org.apache.bcel.classfile

Class Unknown

java.lang.Object

org.apache.bcel.classfile.Attribute

org.apache.bcel.classfile.Unknown

All Implemented Interfaces:

Cloneable, Node

public final class Unknown
extends Attribute

This class represents a reference to an unknown (i.e., application-specific) attribute of a class. It is instantiated from the Attribute.readAttribute(java.io.DataInput, ConstantPool) method. Applications that need to read in application-specific attributes should create an UnknownAttributeReader implementation and attach it via Attribute.addAttributeReader(String, UnknownAttributeReader).

See Also:

• Attribute
• UnknownAttributeReader

Field Summary

Fields inherited from class org.apache.bcel.classfile.Attribute

constant_pool, EMPTY_ARRAY, length, name_index, tag

Constructor Summary

Constructors

Constructor	Description
Unknown(int nameIndex, int length, byte[] bytes, ConstantPool constantPool)	Constructs a new instance for a non-standard attribute.
Unknown(Unknown unknown)	Constructs a new instance from another instance.

Method Summary

Modifier and Type	Method	Description
void	accept(Visitor v)	Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
Attribute	copy(ConstantPool constantPool)
void	dump(DataOutputStream file)	Dumps unknown bytes to file stream.
byte[]	getBytes()
String	getName()
void	setBytes(byte[] bytes)
String	toString()

Methods inherited from class org.apache.bcel.classfile.Attribute

addAttributeReader, addAttributeReader, clone, getConstantPool, getLength, getNameIndex, getTag, println, readAttribute, readAttribute, removeAttributeReader, setConstantPool, setLength, setNameIndex

Methods inherited from class java.lang.Object

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

Constructor Details

Unknown

public Unknown(int nameIndex,
 int length,
 byte[] bytes,
 ConstantPool constantPool)

Constructs a new instance for a non-standard attribute.

Parameters:

nameIndex - Index in constant pool

length - Content length in bytes

bytes - Attribute contents

constantPool - Array of constants

Unknown

public Unknown(Unknown unknown)

Constructs a new instance from another instance. Note that both objects use the same references (shallow copy). Use clone() for a physical copy.

Parameters:

unknown - Source.

Method Details

accept

public void accept(Visitor v)

Called by objects that are traversing the nodes of the tree implicitly 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

Specified by:

accept in class Attribute

Parameters:

v - Visitor object

copy

public Attribute copy(ConstantPool constantPool)

Specified by:

copy in class Attribute

Parameters:

constantPool - constant pool to save.

Returns:

deep copy of this attribute

dump

public void dump(DataOutputStream file)
          throws IOException

Dumps unknown bytes to file stream.

Overrides:

dump in class Attribute

Parameters:

file - Output file stream

Throws:

IOException - if an I/O error occurs.

getBytes

public byte[] getBytes()

Returns:

data bytes.

getName

public String getName()

Overrides:

getName in class Attribute

Returns:

name of attribute.

setBytes

public void setBytes(byte[] bytes)

Parameters:

bytes - the bytes to set

toString

public String toString()

Overrides:

toString in class Attribute

Returns:

String representation.