/*******************************************************************************
 * Copyright (c) 2005 Contributors.
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution and is available at
 * http://eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Alexandre Vasseur         initial implementation
 *******************************************************************************/
package org.aspectj.weaver.loadtime;

import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.security.ProtectionDomain;

/**
 * Java 1.5 adapter for class pre processor
 *
 * @author <a href="mailto:alex@gnilux.com">Alexandre Vasseur</a>
 */
public class ClassPreProcessorAgentAdapter implements ClassFileTransformer {

    /**
     * Concrete preprocessor.
     */
    private static ClassPreProcessor s_preProcessor;

    static {
        try {
            s_preProcessor = new Aj();
            s_preProcessor.initialize();
        } catch (Exception e) {
            throw new ExceptionInInitializerError("could not initialize JSR163 preprocessor due to: " + e.toString());
        }
    }

    /**
     * Weaving delegation
     *
     * @param loader              the defining class loader
     * @param className           the name of class beeing loaded
     * @param classBeingRedefined when hotswap is called
     * @param protectionDomain
     * @param bytes               the bytecode before weaving
     * @return the weaved bytecode
     */
    public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,
                            ProtectionDomain protectionDomain, byte[] bytes) throws IllegalClassFormatException {
        if (classBeingRedefined == null) {
            return s_preProcessor.preProcess(className, bytes, loader);
        } else {
            //FIXME av for now we skip hotswap. We should think more about that
            new Exception("AspectJ5 does not weave hotswapped class (" + className + ")").printStackTrace();
            return bytes;
        }
    }

}