MultipleTransformer.java

/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2011, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.capedwarf.bytecode;

import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.security.ProtectionDomain;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;

/**
 * @author <a href="mailto:ales.justin@jboss.org">Ales Justin</a>
 * @author <a href="mailto:marko.luksa@gmail.com">Marko Luksa</a>
 */
public class MultipleTransformer implements ClassFileTransformer {

    protected Logger log = Logger.getLogger(getClass().getName());

    private Map<String, ClassFileTransformer> transformers = new HashMap<String, ClassFileTransformer>();

    protected void register(String fullName, ClassFileTransformer transformer) {
        transformers.put(fullName, transformer);
        transformers.put(convertToPath(fullName), transformer);
    }

    private static String convertToPath(String fullName) {
        return fullName.replace(".", "/");
    }

    public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
        ClassFileTransformer cft = transformers.get(className);
        if (cft != null)
            return cft.transform(loader, className, classBeingRedefined, protectionDomain, classfileBuffer);

        return classfileBuffer;
    }
}