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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) 2003, 2008 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.runtime;

/**
 * An extension delta represents changes to the extension registry.
 * 
 * This interface can be used without OSGi running.
 * 

 * This interface is not intended to be implemented by clients.
 * 
 * @since 3.0
 * @noimplement This interface is not intended to be implemented by clients.
 */
public interface IExtensionDelta {
	/**
	 * Delta kind constant indicating that an extension has been added to an
	 * extension point.
	 * @see IExtensionDelta#getKind()
	 */
	public int ADDED = 1;
	/**
	 * Delta kind constant indicating that an extension has been removed from an
	 * extension point.
	 * @see IExtensionDelta#getKind()
	 */
	public int REMOVED = 2;

	/**
	 * The kind of this extension delta.
	 *
	 * @return the kind of change this delta represents
	 * @see #ADDED
	 * @see #REMOVED
	 */
	public int getKind();

	/**
	 * Returns the affected extension.
	 *
	 * @return the affected extension
	 */
	public IExtension getExtension();

	/**
	 * Returns the affected extension point.
	 *
	 * @return the affected extension point
	 */
	public IExtensionPoint getExtensionPoint();
}