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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.classfile;

/* ====================================================================
 * 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 java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import org.aspectj.apache.bcel.Constants;

/**
 * This class represents a inner class attribute, i.e., the class indices of the inner and outer classes, the name and the
 * attributes of the inner class.
 *
 * @version $Id: InnerClass.java,v 1.4 2009/09/10 15:35:05 aclement Exp $
 * @author M. Dahm
 * @see InnerClasses
 */
public final class InnerClass implements Cloneable, Node {
	private int inner_class_index;
	private int outer_class_index;
	private int inner_name_index;
	private int inner_access_flags;

	/**
	 * Initialize from another object.
	 */
	public InnerClass(InnerClass c) {
		this(c.getInnerClassIndex(), c.getOuterClassIndex(), c.getInnerNameIndex(), c.getInnerAccessFlags());
	}

	/**
	 * Construct object from file stream.
	 *
	 * @param file Input stream
	 * @throws IOException
	 */
	InnerClass(DataInputStream file) throws IOException {
		this(file.readUnsignedShort(), file.readUnsignedShort(), file.readUnsignedShort(), file.readUnsignedShort());
	}

	/**
	 * @param inner_class_index Class index in constant pool of inner class
	 * @param outer_class_index Class index in constant pool of outer class
	 * @param inner_name_index Name index in constant pool of inner class
	 * @param inner_access_flags Access flags of inner class
	 */
	public InnerClass(int inner_class_index, int outer_class_index, int inner_name_index, int inner_access_flags) {
		this.inner_class_index = inner_class_index;
		this.outer_class_index = outer_class_index;
		this.inner_name_index = inner_name_index;
		this.inner_access_flags = inner_access_flags;
	}

	/**
	 * Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class. I.e., the
	 * hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
	 *
	 * @param v Visitor object
	 */
	public void accept(ClassVisitor v) {
		v.visitInnerClass(this);
	}

	/**
	 * Dump inner class attribute to file stream in binary format.
	 *
	 * @param file Output file stream
	 * @throws IOException
	 */
	public final void dump(DataOutputStream file) throws IOException {
		file.writeShort(inner_class_index);
		file.writeShort(outer_class_index);
		file.writeShort(inner_name_index);
		file.writeShort(inner_access_flags);
	}

	/**
	 * @return access flags of inner class.
	 */
	public final int getInnerAccessFlags() {
		return inner_access_flags;
	}

	/**
	 * @return class index of inner class.
	 */
	public final int getInnerClassIndex() {
		return inner_class_index;
	}

	/**
	 * @return name index of inner class.
	 */
	public final int getInnerNameIndex() {
		return inner_name_index;
	}

	/**
	 * @return class index of outer class.
	 */
	public final int getOuterClassIndex() {
		return outer_class_index;
	}

	/**
	 * @param inner_access_flags.
	 */
	public final void setInnerAccessFlags(int inner_access_flags) {
		this.inner_access_flags = inner_access_flags;
	}

	/**
	 * @param inner_class_index.
	 */
	public final void setInnerClassIndex(int inner_class_index) {
		this.inner_class_index = inner_class_index;
	}

	/**
	 * @param inner_name_index.
	 */
	public final void setInnerNameIndex(int inner_name_index) {
		this.inner_name_index = inner_name_index;
	}

	/**
	 * @param outer_class_index.
	 */
	public final void setOuterClassIndex(int outer_class_index) {
		this.outer_class_index = outer_class_index;
	}

	/**
	 * @return String representation.
	 */
	@Override
	public final String toString() {
		return "InnerClass(" + inner_class_index + ", " + outer_class_index + ", " + inner_name_index + ", " + inner_access_flags
				+ ")";
	}

	/**
	 * @return Resolved string representation
	 */
	public final String toString(ConstantPool constant_pool) {
		String inner_class_name, outer_class_name, inner_name, access;

		inner_class_name = constant_pool.getConstantString(inner_class_index, Constants.CONSTANT_Class);
		inner_class_name = Utility.compactClassName(inner_class_name);

		if (outer_class_index != 0) {
			outer_class_name = constant_pool.getConstantString(outer_class_index, Constants.CONSTANT_Class);
			outer_class_name = Utility.compactClassName(outer_class_name);
		} else
			outer_class_name = "";

		if (inner_name_index != 0)
			inner_name = ((ConstantUtf8) constant_pool.getConstant(inner_name_index, Constants.CONSTANT_Utf8)).getValue();
		else
			inner_name = "";

		access = Utility.accessToString(inner_access_flags, true);
		access = access.equals("") ? "" : (access + " ");

		return "InnerClass:" + access + inner_class_name + "(\"" + outer_class_name + "\", \"" + inner_name + "\")";
	}

	/**
	 * @return deep copy of this object
	 */
	public InnerClass copy() {
		try {
			return (InnerClass) clone();
		} catch (CloneNotSupportedException e) {
		}

		return null;
	}
}