File AnnotationProcessors.java of Package eclipse

/*
 * Copyright 2004 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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package com.sun.mirror.apt;

import com.sun.mirror.apt.*;
import java.util.*;

/**
 * Utilities to create specialized annotation processors.
 *
 * @since 1.5
 * @author Joseph D. Darcy
 * @author Scott Seligman
 */
public class AnnotationProcessors {
    static class NoOpAP implements AnnotationProcessor {
	NoOpAP() {}
	public void process(){}
    }

    /**
     * Combines multiple annotation processors into a simple composite
     * processor.
     * The composite processor functions by invoking each of its component
     * processors in sequence.
     */
    static class CompositeAnnotationProcessor implements AnnotationProcessor {
    
	private List<AnnotationProcessor> aps = 
	    new LinkedList<AnnotationProcessor>();

	/**
	 * Constructs a new composite annotation processor.
	 * @param aps  the component annotation processors
	 */
	public CompositeAnnotationProcessor(Collection<AnnotationProcessor> aps) {
	    this.aps.addAll(aps);
	}

	/**
	 * Constructs a new composite annotation processor.
	 * @param aps  the component annotation processors
	 */
	public CompositeAnnotationProcessor(AnnotationProcessor... aps) {
	    for(AnnotationProcessor ap: aps)
		this.aps.add(ap);
	}

	/**
	 * Invokes the <tt>process</tt> method of each component processor,
	 * in the order in which the processors were passed to the constructor.
	 */
	public void process() { 
	    for(AnnotationProcessor ap: aps)
		ap.process();
	}
    }
 

    /**
     *  An annotation processor that does nothing and has no state.
     *  May be used multiple times.
     *
     * @since 1.5
     */
    public final static AnnotationProcessor NO_OP = new NoOpAP();
 
    /**
     * Constructs a new composite annotation processor.  A composite
     * annotation processor combines multiple annotation processors
     * into one and functions by invoking each of its component
     * processors' process methods in sequence.
     *
     * @param aps The processors to create a composite of
     * @since 1.5
     */
    public static AnnotationProcessor getCompositeAnnotationProcessor(AnnotationProcessor... aps) {
	return new CompositeAnnotationProcessor(aps);
    }
 
    /**
     * Constructs a new composite annotation processor.  A composite
     * annotation processor combines multiple annotation processors
     * into one and functions by invoking each of its component
     * processors' process methods in the sequence the processors are
     * returned by the collection's iterator.
     *
     * @param aps A collection of processors to create a composite of
     * @since 1.5
     */
    public static AnnotationProcessor getCompositeAnnotationProcessor(Collection<AnnotationProcessor> aps) {
	return new CompositeAnnotationProcessor(aps);
    }
}