org.hibernate.bytecode.spi

Class AbstractClassTransformerImpl

java.lang.Object

org.hibernate.bytecode.spi.AbstractClassTransformerImpl

All Implemented Interfaces:

ClassTransformer

Direct Known Subclasses:

JavassistClassTransformer

public abstract class AbstractClassTransformerImpl
extends Object
implements ClassTransformer

Basic implementation of the ClassTransformer contract.

Author:

Emmanuel Bernard, Steve Ebersole

Field Summary

Fields

Modifier and Type	Field and Description
protected ClassFilter	classFilter
protected FieldFilter	fieldFilter

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractClassTransformerImpl(ClassFilter classFilter, FieldFilter fieldFilter)

Method Summary

Modifier and Type	Method and Description
protected abstract byte[]	doTransform(ClassLoader loader, String className, Class classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) Delegate the transformation call from transform(java.lang.ClassLoader, java.lang.String, java.lang.Class, java.security.ProtectionDomain, byte[])
byte[]	transform(ClassLoader loader, String className, Class classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) Invoked when a class is being loaded or redefined to add hooks for persistence bytecode manipulation.

Methods inherited from class java.lang.Object

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

Field Detail

classFilter

protected final ClassFilter classFilter

fieldFilter

protected final FieldFilter fieldFilter

Constructor Detail

AbstractClassTransformerImpl

protected AbstractClassTransformerImpl(ClassFilter classFilter,
                                       FieldFilter fieldFilter)

Method Detail

transform

public byte[] transform(ClassLoader loader,
                        String className,
                        Class classBeingRedefined,
                        ProtectionDomain protectionDomain,
                        byte[] classfileBuffer)

Description copied from interface: ClassTransformer

Invoked when a class is being loaded or redefined to add hooks for persistence bytecode manipulation.

Specified by:

transform in interface ClassTransformer

Parameters:

loader - the defining class loaderof the class being transformed. It may be null if using bootstrap loader

className - The name of the class being transformed

classBeingRedefined - If an already loaded class is being redefined, then pass this as a parameter

protectionDomain - ProtectionDomain of the class being (re)-defined

classfileBuffer - The input byte buffer in class file format

Returns:

A well-formed class file that can be loaded

doTransform

protected abstract byte[] doTransform(ClassLoader loader,
                                      String className,
                                      Class classBeingRedefined,
                                      ProtectionDomain protectionDomain,
                                      byte[] classfileBuffer)

Delegate the transformation call from transform(java.lang.ClassLoader, java.lang.String, java.lang.Class, java.security.ProtectionDomain, byte[])

Parameters:

loader - The class loader to use

className - The name of the class to transform

classBeingRedefined - If an already loaded class is being redefined, then pass this as a parameter

protectionDomain - The protection domain of the class being (re)defined

classfileBuffer - The bytes of the class file.

Returns:

The transformed (enhanced/instrumented) bytes.