org.cojen.classfile
Class Attribute

java.lang.Object
  org.cojen.classfile.Attribute

Direct Known Subclasses:

AnnotationsAttr, CodeAttr, ConstantValueAttr, DeprecatedAttr, EnclosingMethodAttr, ExceptionsAttr, InnerClassesAttr, LineNumberTableAttr, LocalVariableTableAttr, ParameterAnnotationsAttr, SignatureAttr, SourceFileAttr, StackMapTableAttr, SyntheticAttr, UnknownAttr

public abstract class Attribute
extends Object

This class corresponds to the attribute_info structure defined in section 4.7 of The Java Virtual Machine Specification.

Author:

Brian S O'Neill

See Also:

ClassFile

Field Summary

static String	CODE
static String	CONSTANT_VALUE
static String	DEPRECATED
static String	ENCLOSING_METHOD
static String	EXCEPTIONS
static String	INNER_CLASSES
static String	LINE_NUMBER_TABLE
static String	LOCAL_VARIABLE_TABLE
static String	RUNTIME_INVISIBLE_ANNOTATIONS
static String	RUNTIME_INVISIBLE_PARAMETER_ANNOTATIONS
static String	RUNTIME_VISIBLE_ANNOTATIONS
static String	RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS
static String	SIGNATURE
static String	SOURCE_FILE
static String	STACK_MAP_TABLE
static String	SYNTHETIC

Constructor Summary

protected

Attribute(ConstantPool cp, String name)

Method Summary

Attribute[]	getAttributes() Some attributes have sub-attributes.
ConstantPool	getConstantPool() Returns the ConstantPool that this attribute is defined against.
abstract int	getLength() Returns the length (in bytes) of this attribute in the class file.
String	getName() Returns the name of this attribute.
ConstantUTFInfo	getNameConstant()
static Attribute	readFrom(ConstantPool cp, DataInput din, AttributeFactory attrFactory)
void	writeDataTo(DataOutput dout) Write just the attribute specific data.
void	writeTo(DataOutput dout) This method writes the 16 bit name constant index followed by the 32 bit attribute length, followed by the attribute specific data.

Methods inherited from class java.lang.Object

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

Field Detail

CODE

public static final String CODE

See Also:

Constant Field Values

CONSTANT_VALUE

public static final String CONSTANT_VALUE

See Also:

Constant Field Values

DEPRECATED

public static final String DEPRECATED

See Also:

Constant Field Values

EXCEPTIONS

public static final String EXCEPTIONS

See Also:

Constant Field Values

INNER_CLASSES

public static final String INNER_CLASSES

See Also:

Constant Field Values

LINE_NUMBER_TABLE

public static final String LINE_NUMBER_TABLE

See Also:

Constant Field Values

LOCAL_VARIABLE_TABLE

public static final String LOCAL_VARIABLE_TABLE

See Also:

Constant Field Values

SOURCE_FILE

public static final String SOURCE_FILE

See Also:

Constant Field Values

SYNTHETIC

public static final String SYNTHETIC

See Also:

Constant Field Values

SIGNATURE

public static final String SIGNATURE

See Also:

Constant Field Values

ENCLOSING_METHOD

public static final String ENCLOSING_METHOD

See Also:

Constant Field Values

RUNTIME_VISIBLE_ANNOTATIONS

public static final String RUNTIME_VISIBLE_ANNOTATIONS

See Also:

Constant Field Values

RUNTIME_INVISIBLE_ANNOTATIONS

public static final String RUNTIME_INVISIBLE_ANNOTATIONS

See Also:

Constant Field Values

RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS

public static final String RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS

See Also:

Constant Field Values

RUNTIME_INVISIBLE_PARAMETER_ANNOTATIONS

public static final String RUNTIME_INVISIBLE_PARAMETER_ANNOTATIONS

See Also:

Constant Field Values

STACK_MAP_TABLE

public static final String STACK_MAP_TABLE

See Also:

Constant Field Values

Constructor Detail

Attribute

protected Attribute(ConstantPool cp,
                    String name)

Method Detail

getConstantPool

public ConstantPool getConstantPool()

Returns the ConstantPool that this attribute is defined against.

getName

public String getName()

Returns the name of this attribute.

getNameConstant

public ConstantUTFInfo getNameConstant()

getAttributes

public Attribute[] getAttributes()

Some attributes have sub-attributes. Default implementation returns an empty array.

getLength

public abstract int getLength()

Returns the length (in bytes) of this attribute in the class file.

writeTo

public void writeTo(DataOutput dout)
             throws IOException

This method writes the 16 bit name constant index followed by the 32 bit attribute length, followed by the attribute specific data.

Throws:

IOException

writeDataTo

public void writeDataTo(DataOutput dout)
                 throws IOException

Write just the attribute specific data. The default implementation writes nothing.

Throws:

IOException

readFrom

public static Attribute readFrom(ConstantPool cp,
                                 DataInput din,
                                 AttributeFactory attrFactory)
                          throws IOException

Parameters:

attrFactory - optional factory for reading custom attributes

Throws:

IOException