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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2005,2018 Contributors.
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *******************************************************************************/
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 Alexandre Vasseur
 * @author Andy Clement
 */
public class ClassPreProcessorAgentAdapter implements ClassFileTransformer {

	private static ClassPreProcessor classPreProcessor;

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

	/**
	 * Invokes the weaver to modify some set of input bytes.
	 *
	 * @param loader the defining class loader
	 * @param className the name of class being loaded
	 * @param classBeingRedefined is set when hotswap is being attempted
	 * @param protectionDomain the protection domain for the class being loaded
	 * @param bytes the incoming bytes (before weaving)
	 * @return the woven bytes
	 */
	@Override
	public byte[] transform(ClassLoader loader, String className, Class classBeingRedefined, ProtectionDomain protectionDomain,
			final byte[] bytes) throws IllegalClassFormatException {
		if (classBeingRedefined != null) {
			System.err.println("INFO: (Enh120375):  AspectJ attempting reweave of '" + className + "'");
			classPreProcessor.prepareForRedefinition(loader, className);
		}
		return classPreProcessor.preProcess(className, bytes, loader, protectionDomain);
	}
}