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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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package org.aspectj.apache.bcel.generic;

/* ====================================================================
 * 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 (https://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
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * 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
 * .
 */
import org.aspectj.apache.bcel.Constants;
import org.aspectj.apache.bcel.Repository;
import org.aspectj.apache.bcel.classfile.JavaClass;

/**
 * Denotes reference such as java.lang.String.
 *
 * @version $Id: ObjectType.java,v 1.7 2009/09/28 16:39:46 aclement Exp $
 * @author M. Dahm
 */
public class ObjectType extends ReferenceType {
	private String classname;

	/**
	 * @param class_name fully qualified class name, e.g. java.lang.String
	 */
	public ObjectType(String class_name) {
		super(Constants.T_REFERENCE, toSignature(class_name));// "L" + class_name.replace('.', '/') + ";");
		this.classname = class_name;// .replace('/', '.');
	}

	/**
	 * @param classname eg. java.lang.String
	 * @param signature eg. Ljava/lang/String;
	 */
	public ObjectType(String classname, String signature) {
		super(Constants.T_REFERENCE, signature);
		this.classname = classname;
	}

	private static String toSignature(String classname) {
		StringBuilder sig = new StringBuilder();
		sig.append("L").append(classname.replace('.', '/'));
		sig.append(";");
		return sig.toString();
	}

	/**
	 * @return name of referenced class
	 */
	public String getClassName() {
		return classname;
	}

	/**
	 * @return a hash code value for the object.
	 */
	@Override
	public int hashCode() {
		return classname.hashCode();
	}

	/**
	 * @return true if both type objects refer to the same class.
	 */
	@Override
	public boolean equals(Object type) {
		return (type instanceof ObjectType) ? ((ObjectType) type).classname.equals(classname) : false;
	}

	/**
	 * If "this" doesn't reference a class, it references an interface or a non-existant entity.
	 */
	public boolean referencesClass() {
		JavaClass jc = Repository.lookupClass(classname);
		if (jc == null) {
			return false;
		} else {
			return jc.isClass();
		}
	}

	/**
	 * If "this" doesn't reference an interface, it references a class or a non-existant entity.
	 */
	public boolean referencesInterface() {
		JavaClass jc = Repository.lookupClass(classname);
		if (jc == null) {
			return false;
		} else {
			return !jc.isClass();
		}
	}

	public boolean subclassOf(ObjectType superclass) {
		if (this.referencesInterface() || superclass.referencesInterface()) {
			return false;
		}

		return Repository.instanceOf(this.classname, superclass.classname);
	}

	/**
	 * Java Virtual Machine Specification edition 2, 5.4.4 Access Control
	 */
	public boolean accessibleTo(ObjectType accessor) {
		JavaClass jc = Repository.lookupClass(classname);

		if (jc.isPublic()) {
			return true;
		} else {
			JavaClass acc = Repository.lookupClass(accessor.classname);
			return acc.getPackageName().equals(jc.getPackageName());
		}
	}
}