/*
* Copyright 2002-2006 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.instrument.classloading.glassfish;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.security.ProtectionDomain;
import javax.persistence.spi.ClassTransformer;
/**
* Adapter that implements the JPA ClassTransformer interface (as required by GlassFish)
* based on a given JDK 1.5 ClassFileTransformer.
*
* @author Costin Leau
* @author Juergen Hoeller
* @since 2.0.1
*/
class ClassTransformerAdapter implements ClassTransformer {
private final ClassFileTransformer classFileTransformer;
/**
* Build a new ClassTransformerAdapter for the given ClassFileTransformer.
* @param classFileTransformer the JDK 1.5 ClassFileTransformer to wrap
*/
public ClassTransformerAdapter(ClassFileTransformer classFileTransformer) {
this.classFileTransformer = classFileTransformer;
}
public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,
ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
byte[] result = this.classFileTransformer.transform(
loader, className, classBeingRedefined, protectionDomain, classfileBuffer);
// If no transformation was done, return null.
return (result == classfileBuffer ? null : result);
}
}