/*
* Copyright 2002-2007 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;
import java.lang.instrument.ClassFileTransformer;
import org.springframework.core.OverridingClassLoader;
/**
* Simplistic implementation of an instrumentable <code>ClassLoader</code>.
*
* <p>Usable in tests and standalone environments.
*
* @author Rod Johnson
* @author Costin Leau
* @since 2.0
*/
public class SimpleInstrumentableClassLoader extends OverridingClassLoader {
private final WeavingTransformer weavingTransformer;
/**
* Create a new <code>SimpleLoadTimeWeaver</code> for the given
* <code>ClassLoader</code>.
* @param parent the <code>ClassLoader</code> to build a simple
* instrumentable <code>ClassLoader</code> for
*/
public SimpleInstrumentableClassLoader(ClassLoader parent) {
super(parent);
this.weavingTransformer = new WeavingTransformer(parent);
}
/**
* Add a <code>ClassFileTransformer</code> to be applied by this
* <code>ClassLoader</code>.
* @param transformer the <code>ClassFileTransformer</code> to register
*/
public void addTransformer(ClassFileTransformer transformer) {
this.weavingTransformer.addTransformer(transformer);
}
@Override
protected byte[] transformIfNecessary(String name, byte[] bytes) {
return this.weavingTransformer.transformIfNecessary(name, bytes);
}
}
|