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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) 2009 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:
 * initial implementation              Andy Clement
 *******************************************************************************/
package org.aspectj.lang.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * DeclareMixin annotation - see design and usage in https://bugs.eclipse.org/bugs/show_bug.cgi?id=266552
 * 
 * Attached to a factory method, this annotation indicates that any types matching the pattern specified in the annotation value
 * will have new methods mixed in. The methods will be selected based on a combination of the return type of the factory method,
 * possibly sub-setted by any list of interfaces specified in the interfaces annotation value.
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface DeclareMixin {

	/**
	 * @return the target types expression
	 */
	String value();

	/**
	 * @return array of interfaces that are to be mixed in. This is optional and if not specified the return type of the annotated method
	 * will be used to determine the interface to mix in.
	 */
	Class[] interfaces() default { Object.class };

}