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     */
019    package org.apache.wiki.tags;
020    
021    import java.io.IOException;
022    
023    import org.apache.log4j.Logger;
024    import org.apache.wiki.WikiEngine;
025    import org.apache.wiki.WikiPage;
026    import org.apache.wiki.api.exceptions.ProviderException;
027    import org.apache.wiki.attachment.AttachmentManager;
028    
029    
030    /**
031     *  Includes body if page has attachments.
032     *
033     *  @since 2.0
034     */
035    public class HasAttachmentsTag extends WikiTagBase {
036    
037        private static final long serialVersionUID = 0L;
038        private static final Logger log = Logger.getLogger( HasAttachmentsTag.class );
039        
040        public final int doWikiStartTag()
041            throws IOException
042        {
043            WikiEngine engine = m_wikiContext.getEngine();
044            WikiPage   page   = m_wikiContext.getPage();
045            AttachmentManager mgr = engine.getAttachmentManager();
046    
047            try
048            {
049                if( page != null && engine.pageExists(page) && mgr.attachmentsEnabled() )
050                {
051                    if( mgr.hasAttachments(page) )
052                    {
053                        return EVAL_BODY_INCLUDE;
054                    }
055                }
056            }
057            catch( ProviderException e )
058            {
059                log.fatal("Provider failed while trying to check for attachements",e);
060                // FIXME: THrow something.
061            }
062    
063            return SKIP_BODY;
064        }
065    }