at.chrl.callbacks.enhancer

Class CallbackClassFileTransformer

java.lang.Object

at.chrl.callbacks.enhancer.CallbackClassFileTransformer

All Implemented Interfaces:

ClassFileTransformer

Direct Known Subclasses:

GlobalCallbackEnhancer, ObjectCallbackEnhancer

public abstract class CallbackClassFileTransformer
extends Object
implements ClassFileTransformer

Basic class that checks if class can be transformed. JDK classes are not a subject of transformation.

Author:

SoulKeeper

Constructor Summary

Constructors

Constructor and Description
CallbackClassFileTransformer()

Method Summary

Modifier and Type	Method and Description
byte[]	transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) This method analyzes class and adds callback support if needed.
protected abstract byte[]	transformClass(ClassLoader loader, byte[] clazzBytes) Actually transforms the class.

Methods inherited from class java.lang.Object

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

Constructor Detail

CallbackClassFileTransformer

public CallbackClassFileTransformer()

Method Detail

transform

public byte[] transform(ClassLoader loader,
                        String className,
                        Class<?> classBeingRedefined,
                        ProtectionDomain protectionDomain,
                        byte[] classfileBuffer)
                 throws IllegalClassFormatException

This method analyzes class and adds callback support if needed.

Specified by:

transform in interface ClassFileTransformer

Parameters:

loader - ClassLoader of class

className - class name

classBeingRedefined - not used

protectionDomain - not used

classfileBuffer - basic class data

Throws:

IllegalClassFormatException

transformClass

protected abstract byte[] transformClass(ClassLoader loader,
                                         byte[] clazzBytes)
                                  throws Exception

Actually transforms the class.

Parameters:

loader - class loader of this class

clazzBytes - class bytes

Returns:

class as byte array if was transformed or null if was not

Throws:

Exception - if something went wrong