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The AspectJ weaver introduces advices to java classes
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/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache BCEL", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 */
package org.aspectj.apache.bcel.util;

import java.lang.ref.WeakReference;

import org.aspectj.apache.bcel.classfile.JavaClass;

public class ThreadLocalAwareRepository implements Repository {

	private static ThreadLocal> threadLocal = new ThreadLocal<>();

	public static void setCurrentRepository(Repository repository) {
		threadLocal.set(new WeakReference<>(repository));
	}

	private static Repository currentRepository() {
		WeakReference ref = threadLocal.get();
		Repository repo = null;
		if (ref != null) {
			repo = ref.get();
		}
		if (repo == null) {
			repo = SyntheticRepository.getInstance();
		}
		return repo;
	}

	@Override
	public void storeClass(JavaClass clazz) {
		currentRepository().storeClass(clazz);
	}

	@Override
	public void removeClass(JavaClass clazz) {
		currentRepository().removeClass(clazz);
	}

	@Override
	public JavaClass findClass(String className) {
		return currentRepository().findClass(className);
	}

	@Override
	public JavaClass loadClass(String className) throws ClassNotFoundException {
		return currentRepository().loadClass(className);
	}

	@Override
	public JavaClass loadClass(Class clazz) throws ClassNotFoundException {
		return currentRepository().loadClass(clazz);
	}

	@Override
	public void clear() {
		currentRepository().clear();
	}

}