001/* 
002    Licensed to the Apache Software Foundation (ASF) under one
003    or more contributor license agreements.  See the NOTICE file
004    distributed with this work for additional information
005    regarding copyright ownership.  The ASF licenses this file
006    to you under the Apache License, Version 2.0 (the
007    "License"); you may not use this file except in compliance
008    with the License.  You may obtain a copy of the License at
009
010       http://www.apache.org/licenses/LICENSE-2.0
011
012    Unless required by applicable law or agreed to in writing,
013    software distributed under the License is distributed on an
014    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015    KIND, either express or implied.  See the License for the
016    specific language governing permissions and limitations
017    under the License.  
018 */
019package org.apache.wiki.tags;
020
021import org.apache.wiki.api.core.Engine;
022import org.apache.wiki.api.core.Page;
023import org.apache.wiki.api.exceptions.ProviderException;
024import org.apache.wiki.pages.PageManager;
025
026import java.io.IOException;
027
028/**
029 *  Includes the body in case there is no such page available.
030 *
031 *  @since 2.0
032 */
033public class NoSuchPageTag extends WikiTagBase {
034
035    private static final long serialVersionUID = 0L;
036    
037    private String m_pageName;
038
039    @Override
040    public void initTag() {
041        super.initTag();
042        m_pageName = null;
043    }
044
045    public void setPage( final String name )
046    {
047        m_pageName = name;
048    }
049
050    public String getPage()
051    {
052        return m_pageName;
053    }
054
055    @Override
056    public int doWikiStartTag() throws IOException, ProviderException {
057        final Engine engine = m_wikiContext.getEngine();
058        final Page page;
059
060        if( m_pageName == null ) {
061            page = m_wikiContext.getPage();
062        } else {
063            page = engine.getManager( PageManager.class ).getPage( m_pageName );
064        }
065
066        if( page != null && engine.getManager( PageManager.class ).wikiPageExists( page.getName(), page.getVersion() ) ) {
067            return SKIP_BODY;
068        }
069
070        return EVAL_BODY_INCLUDE;
071    }
072}