/*

 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

package com.sun.tools.doclets.internal.toolkit.taglets;

import com.sun.javadoc.*;

import com.sun.tools.doclets.internal.toolkit.Content;

import com.sun.tools.doclets.internal.toolkit.util.*;

/**

 * A taglet that represents the @return tag.

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 *

 * @author Jamie Ho

 * @since 1.4

 */

public class ReturnTaglet extends BaseExecutableMemberTaglet

        implements InheritableTaglet {

    public ReturnTaglet() {

        name = "return";

    }

    /**

     * {@inheritDoc}

     */

    public void inherit(DocFinder.Input input, DocFinder.Output output) {

       Tag[] tags = input.element.tags("return");

        if (tags.length > 0) {

            output.holder = input.element;

            output.holderTag = tags[0];

            output.inlineTags = input.isFirstSentence ?

                tags[0].firstSentenceTags() : tags[0].inlineTags();

        }

    }

    /**

     * Return true if this <code>Taglet</code>

     * is used in constructor documentation.

     * @return true if this <code>Taglet</code>

     * is used in constructor documentation and false

     * otherwise.

     */

    public boolean inConstructor() {

        return false;

    }

    /**

     * {@inheritDoc}

     */

    public Content getTagletOutput(Doc holder, TagletWriter writer) {

        Type returnType = ((MethodDoc) holder).returnType();

        Tag[] tags = holder.tags(name);

        //Make sure we are not using @return tag on method with void return type.

        if (returnType.isPrimitive() && returnType.typeName().equals("void")) {

            if (tags.length > 0) {

                writer.getMsgRetriever().warning(holder.position(),

                    "doclet.Return_tag_on_void_method");

            }

            return null;

        }

        //Inherit @return tag if necessary.

        if (tags.length == 0) {

            DocFinder.Output inheritedDoc =

                DocFinder.search(writer.configuration(), new DocFinder.Input((MethodDoc) holder, this));

            tags = inheritedDoc.holderTag == null ? tags : new Tag[] {inheritedDoc.holderTag};

        }

        return tags.length > 0 ? writer.returnTagOutput(tags[0]) : null;

    }

}