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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) 2002 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
 *
 * Contributors:
 *     PARC     initial implementation
 *   Andy Clement   pushed down into bcel module
 * ******************************************************************/

package org.aspectj.apache.bcel.generic;

/**
 * A tag is an instruction-targeter that does not remember its target. Instruction handles will maintain a list of targeters but
 * there won't be a way to get back from the tag to the instruction. Maintaining these backward/forward links just slows everything
 * down.
 */
public abstract class Tag implements InstructionTargeter, Cloneable {

	public Tag() {
	}

	// ---- from InstructionTargeter
	public boolean containsTarget(InstructionHandle ih) {
		return false;
	}

	public void updateTarget(InstructionHandle oldHandle, InstructionHandle newHandle) {
		oldHandle.removeTargeter(this);
		if (newHandle != null) {
			newHandle.addTargeter(this);
		}
	}

	public Tag copy() {
		try {
			return (Tag) clone();
		} catch (CloneNotSupportedException e) {
			throw new RuntimeException("Sanity check, can't clone me");
		}
	}
}