Package javassist.bytecode

Class ClassFileWriter.MethodWriter

java.lang.Object

javassist.bytecode.ClassFileWriter.MethodWriter

Enclosing class:

ClassFileWriter

public static final class ClassFileWriter.MethodWriter
extends java.lang.Object

Method.

Field Summary

Fields

Modifier and Type	Field	Description
private int	catchCount
private int	catchPos
protected int	codeIndex
protected ClassFileWriter.ConstPoolWriter	constPool
private boolean	isAbstract
private int	methodCount
protected ByteStream	output
protected int	stackIndex
private int	startPos
protected int	throwsIndex

Constructor Summary

Constructors

Constructor	Description
MethodWriter(ClassFileWriter.ConstPoolWriter cp)

Method Summary

Modifier and Type	Method	Description
void	add(int b)	Appends an 8bit value of bytecode.
void	add16(int b)	Appends a 16bit value of bytecode.
void	add32(int b)	Appends a 32bit value of bytecode.
void	addCatch(int startPc, int endPc, int handlerPc, int catchType)	Appends an exception_table entry to the Code_attribute.
void	addInvoke(int opcode, java.lang.String targetClass, java.lang.String methodName, java.lang.String descriptor)	Appends a invokevirtual, inovkespecial, or invokestatic bytecode.
void	begin(int accessFlags, int name, int descriptor, int[] exceptions, ClassFileWriter.AttributeWriter aw)	Starts adding a new method.
void	begin(int accessFlags, java.lang.String name, java.lang.String descriptor, java.lang.String[] exceptions, ClassFileWriter.AttributeWriter aw)	Starts Adding a new method.
void	codeEnd(int maxStack, int maxLocals)	Ends appending bytecode.
(package private) int	dataSize()
void	end(StackMapTable.Writer smap, ClassFileWriter.AttributeWriter aw)	Ends adding a new method.
(package private) int	numOfMethods()
int	size()	Returns the length of the bytecode that has been added so far.
(package private) void	write(java.io.OutputStream out)	Writes the added methods.
private void	writeThrows(int[] exceptions)

Methods inherited from class java.lang.Object

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

Field Detail

output

protected ByteStream output

constPool

protected ClassFileWriter.ConstPoolWriter constPool

methodCount

private int methodCount

codeIndex

protected int codeIndex

throwsIndex

protected int throwsIndex

stackIndex

protected int stackIndex

startPos

private int startPos

isAbstract

private boolean isAbstract

catchPos

private int catchPos

catchCount

private int catchCount

Constructor Detail

MethodWriter

MethodWriter(ClassFileWriter.ConstPoolWriter cp)

Method Detail

begin

public void begin(int accessFlags,
                  java.lang.String name,
                  java.lang.String descriptor,
                  java.lang.String[] exceptions,
                  ClassFileWriter.AttributeWriter aw)

Starts Adding a new method.

Parameters:

accessFlags - access flags.

name - the method name.

descriptor - the method signature.

exceptions - throws clause. It may be null. The class names must be the JVM-internal representations like java/lang/Exception.

aw - attributes to the Method_info.

begin

public void begin(int accessFlags,
                  int name,
                  int descriptor,
                  int[] exceptions,
                  ClassFileWriter.AttributeWriter aw)

Starts adding a new method.

Parameters:

accessFlags - access flags.

name - the method name. an index indicating its CONSTANT_Utf8_info.

descriptor - the field type. an index indicating its CONSTANT_Utf8_info.

exceptions - throws clause. indexes indicating CONSTANT_Class_infos. It may be null.

aw - attributes to the Method_info.

writeThrows

private void writeThrows(int[] exceptions)

add

public void add(int b)

Appends an 8bit value of bytecode.

See Also:

Opcode

add16

public void add16(int b)

Appends a 16bit value of bytecode.

add32

public void add32(int b)

Appends a 32bit value of bytecode.

addInvoke

public void addInvoke(int opcode,
                      java.lang.String targetClass,
                      java.lang.String methodName,
                      java.lang.String descriptor)

Appends a invokevirtual, inovkespecial, or invokestatic bytecode.

See Also:

Opcode

codeEnd

public void codeEnd(int maxStack,
                    int maxLocals)

Ends appending bytecode.

addCatch

public void addCatch(int startPc,
                     int endPc,
                     int handlerPc,
                     int catchType)

Appends an exception_table entry to the Code_attribute. This method is available only after the codeEnd method is called.

Parameters:

catchType - an index indicating a CONSTANT_Class_info.

end

public void end(StackMapTable.Writer smap,
                ClassFileWriter.AttributeWriter aw)

Ends adding a new method. The add method must be called before the end method is called.

Parameters:

smap - a stack map table. may be null.

aw - attributes to the Code_attribute. may be null.

size

public int size()

Returns the length of the bytecode that has been added so far.

Returns:

the length in bytes.

Since:

3.19

numOfMethods

int numOfMethods()

dataSize

int dataSize()

write

void write(java.io.OutputStream out)
    throws java.io.IOException

Writes the added methods.

Throws:

java.io.IOException