jmplib.agent

Class AbstractTransformer

java.lang.Object

jmplib.agent.AbstractTransformer

All Implemented Interfaces:

java.lang.instrument.ClassFileTransformer

Direct Known Subclasses:

ChangeWriterTransformer, DefaultMethodTransformer, ExternalFieldAccessTransformer, IsInstanceTransformer, OriginalClassLoadTimeTransformer, RedirectMethodTransformer, VersionClassLoadTimeTransformer

public abstract class AbstractTransformer
extends java.lang.Object
implements java.lang.instrument.ClassFileTransformer

Superclass of all transformers of the library. This class defines the behaviour of all transformers.

Author:

Ignacio Lagartos

Constructor Summary

Constructors

Constructor and Description
AbstractTransformer()

Method Summary

Modifier and Type	Method and Description
protected abstract boolean	instrumentableClass(java.lang.String className, java.lang.Class<?> classBeingRedefined) Checks if the class have to be transformed
byte[]	transform(java.lang.ClassLoader loader, java.lang.String className, java.lang.Class<?> classBeingRedefined, java.security.ProtectionDomain protectionDomain, byte[] classfileBuffer) Checks if the class is instrumentable and transforms it.
protected abstract byte[]	transform(java.lang.String className, java.lang.Class<?> classBeingRedefined, byte[] classfileBuffer) Transforms the bytes of the class

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractTransformer

public AbstractTransformer()

Method Detail

transform

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

Checks if the class is instrumentable and transforms it. If it is not instrumentable, it returns null

Specified by:

transform in interface java.lang.instrument.ClassFileTransformer

Throws:

java.lang.instrument.IllegalClassFormatException

transform

protected abstract byte[] transform(java.lang.String className,
                                    java.lang.Class<?> classBeingRedefined,
                                    byte[] classfileBuffer)

Transforms the bytes of the class

Parameters:

className - The internal class name

classBeingRedefined - The Class object or nullF

classfileBuffer - The bytes of the class

Returns:

instrumentableClass

protected abstract boolean instrumentableClass(java.lang.String className,
                                               java.lang.Class<?> classBeingRedefined)

Checks if the class have to be transformed

Parameters:

className - The internal class name

classBeingRedefined - The Class object

Returns: