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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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/* ====================================================================
 * 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
 * .
 */
package org.aspectj.apache.bcel.classfile;


import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import org.aspectj.apache.bcel.Constants;

/**
 * This class is derived from the abstract Constant class and
 * represents a reference to the name and signature of a field or method.
 *
 * https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.4.8
 *
 * @author Andy Clement
 * @see Constant
 */
public final class ConstantMethodHandle extends Constant {
	private byte referenceKind;
	private int referenceIndex;

	ConstantMethodHandle(DataInputStream file) throws IOException {
		this(file.readByte(), file.readUnsignedShort());
	}

	public ConstantMethodHandle(byte referenceKind, int referenceIndex) {
		super(Constants.CONSTANT_MethodHandle);
		this.referenceKind = referenceKind;
		this.referenceIndex = referenceIndex;
	}

	@Override
	public final void dump(DataOutputStream file) throws IOException {
		file.writeByte(tag);
		file.writeByte(referenceKind);
		file.writeShort(referenceIndex);
	}

	public final byte getReferenceKind() {
		return referenceKind;
	}

	public final int getReferenceIndex() {
		return referenceIndex;
	}

	@Override
	public final String toString() {
		return super.toString() + "(referenceKind=" + referenceKind + ",referenceIndex=" + referenceIndex + ")";
	}

	@Override
	public String getValue() {
		return toString();
	}

	@Override
	public void accept(ClassVisitor v) {
		v.visitConstantMethodHandle(this);
	}

	public static String kindToString(byte kind) {
		switch (kind) {
		case 1: return "getfield";
		case 2: return "getstatic";
		case 3: return "putfield";
		case 4: return "putstatic";
		case 5: return "invokevirtual";
		case 6: return "invokestatic";
		case 7: return "invokespecial";
		case 8: return "newinvokespecial";
		case 9: return "invokeinterface";
			default:
				return "nyi";
		}
	}

}