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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, 2015 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
 *     Sergey Prigogin (Google) - use parameterized types (bug 442021)
 *     Lars Vogel  - Bug 478864
 *******************************************************************************/
package org.eclipse.core.runtime;

/**
 * An interface for an adaptable object.
 * 
 * Adaptable objects can be dynamically extended to provide different 
 * interfaces (or "adapters").  Adapters are created by adapter 
 * factories, which are in turn managed by type by adapter managers.
 * 
 * For example,
 *  *     IAdaptable a = [some adaptable];
 *     IFoo x = Adapters.getAdapter(a, IFoo.class, true);
 *     if (x != null)
 *         [do IFoo things with x]
 * 
 * 
 * This interface can be used without OSGi running.
 * 

 * Clients may implement this interface, or obtain a default implementation
 * of this interface by subclassing PlatformObject.
 * 
 * @see IAdapterFactory
 * @see IAdapterManager
 * @see PlatformObject
 * @see Adapters
 */
public interface IAdaptable {
	/**
	 * Returns an object which is an instance of the given class
	 * associated with this object. Returns null if
	 * no such object can be found.
	 * 
	 * Clients may implement this method but should generally call {@link Adapters#adapt(Object, Class, boolean)}
	 * rather than invoking it directly.
	 *
	 * @param adapter the adapter class to look up
	 * @param  the class type
	 * @return a object of the given class, 
	 *    or null if this object does not
	 *    have an adapter for the given class
	 */
	public  T getAdapter(Class adapter);
}