Class Synthetic

java.lang.Object

org.apache.bcel.classfile.Attribute

org.apache.bcel.classfile.Synthetic

All Implemented Interfaces:

Cloneable, Node

public final class Synthetic
extends Attribute

This class is derived from Attribute and declares this class as 'synthetic', that is, it needs special handling. The JVM specification states "A class member that does not appear in the source code must be marked using a Synthetic attribute." It may appear in the ClassFile attribute table, a field_info table or a method_info table. This class is intended to be instantiated from the Attribute.readAttribute() method.

Synthetic_attribute {
    u2 attribute_name_index;
    u4 attribute_length;
}

See Also:

• Attribute
• JVM Specification: The Synthetic Attribute

Field Summary

Fields inherited from class Attribute

constant_pool, EMPTY_ARRAY, length, name_index, tag

Modifier and Type	Field	Description
protected ConstantPool	constant_pool	Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter.
static final Attribute[]	EMPTY_ARRAY	Empty array.
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

Constructor	Description
Synthetic(int nameIndex, int length, byte[] bytes, ConstantPool constantPool)	Constructs a Synthetic attribute.
Synthetic(Synthetic c)	Initialize from another object.

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)	Creates a deep copy of this attribute.
byte[]	getBytes()	Gets data bytes.
void	setBytes(byte[] bytes)	Sets data bytes.
String	toString()

Methods inherited from class Attribute

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

Modifier and Type	Method	Description
static void	addAttributeReader(String name, AttributeReader attributeReader)	Deprecated. (6.0) Use Attribute.addAttributeReader(String, UnknownAttributeReader) instead.
static void	addAttributeReader(String name, UnknownAttributeReader unknownAttributeReader)	Add an Attribute reader capable of parsing (user-defined) attributes named "name".
Object	clone()	Use copy() if you want to have a deep copy(), that is, with all references copied correctly.
void	dump(DataOutputStream file)	Dumps attribute to file stream in binary format.
final ConstantPool	getConstantPool()	Gets the constant pool used by this object.
final int	getLength()	Gets the length of attribute field in bytes.
String	getName()	Gets the name of the attribute.
final int	getNameIndex()	Gets the name index in constant pool of attribute name.
final byte	getTag()	Gets the tag of attribute, that is, its type.
protected static void	println(String msg)	Prints a message to stderr if debug mode is enabled.
static Attribute	readAttribute(DataInput dataInput, ConstantPool constantPool)	Reads one attribute using standard eight-byte Code headers.
static Attribute	readAttribute(DataInput dataInput, ConstantPool constantPool, boolean compactCodeHeader)	Reads one attribute using the selected Code header layout.
static Attribute	readAttribute(DataInputStream dataInputStream, ConstantPool constantPool)	Reads one attribute using standard eight-byte Code headers.
static void	removeAttributeReader(String name)	Remove attribute reader
final void	setConstantPool(ConstantPool constantPool)	Sets the constant pool to be used for this object.
final void	setLength(int length)	Sets the length in bytes.
final void	setNameIndex(int nameIndex)	Sets the name index of attribute.

Methods inherited from class Object

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

Constructor Details

Synthetic

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

Constructs a Synthetic attribute.

Parameters:

nameIndex - Index in constant pool to CONSTANT_Utf8, which should represent the string "Synthetic".

length - JVM Specification: "The value of the attribute_length item must be zero.".

bytes - Attribute contents.

constantPool - The constant pool this attribute is associated with.

See Also:

• JVM Specification: The Synthetic Attribute

Synthetic

public Synthetic(Synthetic c)

Initialize from another object. Note that both objects use the same references (shallow copy). Use copy() for a physical copy.

Parameters:

c - Source to copy.

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. That is, the hierarchy of methods, fields, attributes, and other elements forms 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)

Description copied from class: Attribute

Creates a deep copy of this attribute.

Specified by:

copy in class Attribute

Parameters:

constantPool - constant pool to save.

Returns:

deep copy of this attribute.

getBytes

public byte[] getBytes()

Gets data bytes.

Returns:

data bytes.

setBytes

public void setBytes(byte[] bytes)

Sets data bytes.

Parameters:

bytes - data bytes.

toString

public String toString()

Overrides:

toString in class Attribute

Returns:

String representation.