at.chrl.callbacks.enhancer

Class GlobalCallbackEnhancer

java.lang.Object

at.chrl.callbacks.enhancer.CallbackClassFileTransformer

at.chrl.callbacks.enhancer.GlobalCallbackEnhancer

All Implemented Interfaces:

ClassFileTransformer

public class GlobalCallbackEnhancer
extends CallbackClassFileTransformer

Author:

SoulKeeper

Constructor Summary

Constructors

Constructor and Description
GlobalCallbackEnhancer()

Method Summary

Modifier and Type	Method and Description
protected void	enhanceMethod(javassist.CtMethod method) Responsible for method enhancing, writing service calls to method.
protected boolean	isEnhanceable(javassist.CtMethod method) Checks if method is enhanceable.
protected byte[]	transformClass(ClassLoader loader, byte[] clazzBytes) Actually transforms the class.
protected String	writeAfterMethod(javassist.CtMethod method, int paramLength, String listenerFieldName) Writes code that will be inserted after method
protected String	writeBeforeMethod(javassist.CtMethod method, int paramLength, String listenerFieldName) Code that is added in the begining of the method

Methods inherited from class at.chrl.callbacks.enhancer.CallbackClassFileTransformer

transform

Methods inherited from class java.lang.Object

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

Constructor Detail

GlobalCallbackEnhancer

public GlobalCallbackEnhancer()

Method Detail

transformClass

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

Description copied from class: CallbackClassFileTransformer

Actually transforms the class.

Specified by:

transformClass in class CallbackClassFileTransformer

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

enhanceMethod

protected void enhanceMethod(javassist.CtMethod method)
                      throws javassist.CannotCompileException,
                             javassist.NotFoundException,
                             ClassNotFoundException

Responsible for method enhancing, writing service calls to method.

Parameters:

method - Method that has to be edited

Throws:

javassist.CannotCompileException - if something went wrong

javassist.NotFoundException - if something went wrong

ClassNotFoundException

writeBeforeMethod

protected String writeBeforeMethod(javassist.CtMethod method,
                                   int paramLength,
                                   String listenerFieldName)
                            throws javassist.NotFoundException

Code that is added in the begining of the method

Parameters:

method - method that should be edited

paramLength - Lenght of methods parameters

listenerFieldName - Listener class that is used for method

Returns:

code that will be inserted before method

Throws:

javassist.NotFoundException - if something went wrong

writeAfterMethod

protected String writeAfterMethod(javassist.CtMethod method,
                                  int paramLength,
                                  String listenerFieldName)
                           throws javassist.NotFoundException

Writes code that will be inserted after method

Parameters:

method - method to edit

paramLength - lenght of method paramenters

listenerFieldName - method listener

Returns:

actual code that should be inserted

Throws:

javassist.NotFoundException - if something went wrong

isEnhanceable

protected boolean isEnhanceable(javassist.CtMethod method)

Checks if method is enhanceable. It should be marked with GlobalCallback annotation, be not native and not abstract

Parameters:

method - method to check

Returns:

check result