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A doclet that generates a resourcedoc xml file: this file contains the javadoc documentation of resource classes, so that this can be used for extending generated wadl with useful documentation.
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/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2010 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at jersey/legal/LICENSE.txt.
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 * as provided by Sun in the GPL Version 2 section of the License file that
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 * Header, with the fields enclosed by brackets [] replaced by your own
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 * Version 2] license."  If you don't indicate a single choice of license, a
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package com.sun.jersey.wadl.resourcedoc;

import com.sun.javadoc.ClassDoc;
import com.sun.javadoc.MethodDoc;
import com.sun.javadoc.ParamTag;
import com.sun.javadoc.Parameter;
import com.sun.jersey.server.wadl.WadlGenerator;
import com.sun.jersey.server.wadl.generators.resourcedoc.model.ClassDocType;
import com.sun.jersey.server.wadl.generators.resourcedoc.model.MethodDocType;
import com.sun.jersey.server.wadl.generators.resourcedoc.model.ParamDocType;

/**
 * A doc processor is handed over javadoc elements so that it can turn this into
 * resource doc elements, even self defined.

 * Created on: Jul 5, 2008

 * 
 * @author Martin Grotzke
 * @version $Id: DocProcessor.java 3252 2010-01-26 23:13:50Z pavel_bucek $
 */
public interface DocProcessor {
    
    /**
     * Specify jaxb classes of instances that you add to the resourcedoc model.
     * These classes are added to the list of classes when creating the jaxb context
     * with JAXBContext.newInstance( clazzes );.
     * @return a list of classes or null
     */
    Class[] getRequiredJaxbContextClasses();

    /**
     * specify which of your elements you want to be handled as CDATA.
     * The use of the '^' between the namespaceURI and the localname
     * seems to be an implementation detail of the xerces code.
     * When processing xml that doesn't use namespaces, simply omit the
     * namespace prefix as shown in the third CDataElement below.
     * 
     * @return an Array of element descriptors or null
     * 
     */
    String[] getCDataElements();

    /**
     * Use this method to extend the provided {@link ClassDocType} with the information from
     * the given {@link ClassDoc}.
     * @param classDoc the class javadoc
     * @param classDocType the {@link ClassDocType} to extend. This will later be processed by the {@link WadlGenerator}s.
     */
    void processClassDoc( ClassDoc classDoc, ClassDocType classDocType );

    /**
     * Process the provided methodDoc and add your custom information to the methodDocType.

     * Use e.g. {@link MethodDocType#getAny()} to store custom elements.
     * @param methodDoc the {@link MethodDoc} representing the docs of your method.
     * @param methodDocType the related {@link MethodDocType} that will later be processed by the {@link WadlGenerator}s.
     */
    void processMethodDoc( MethodDoc methodDoc, MethodDocType methodDocType );

    /**
     * Use this method to extend the provided {@link ParamDocType} with the information from the
     * given {@link ParamTag} and {@link Parameter}.
     * @param paramTag the parameter javadoc
     * @param parameter the parameter (that is documented or not)
     * @param paramDocType the {@link ParamDocType} to extend. This will later be processed by the {@link WadlGenerator}s.
     */
    void processParamTag( ParamTag paramTag, Parameter parameter, ParamDocType paramDocType );

}