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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) 2000, 2005 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.core.internal.dtree;

/**
 * An interface for comparing two data tree objects.  Provides information
 * on how an object has changed from one tree to another.
 */
public interface IComparator {
	/**
	 * Returns an integer describing the changes between two data objects
	 * in a data tree.  The first three bits of the returned integer are
	 * used during calculation of delta trees.  The remaining bits can be
	 * assigned any meaning that is useful to the client.  If there is no
	 * change in the two data objects, this method must return 0.
	 *
	 * @see NodeComparison
	 */
	int compare(Object o1, Object o2);
}