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.logging.log4j.LogManager;
022import org.apache.logging.log4j.Logger;
023import org.apache.wiki.api.core.Engine;
024import org.apache.wiki.api.core.Page;
025import org.apache.wiki.api.exceptions.ProviderException;
026import org.apache.wiki.attachment.AttachmentManager;
027import org.apache.wiki.pages.PageManager;
028
029
030/**
031 *  Includes body if page has attachments.
032 *
033 *  @since 2.0
034 */
035public class HasAttachmentsTag extends WikiTagBase {
036
037    private static final long serialVersionUID = 0L;
038    private static final Logger LOG = LogManager.getLogger( HasAttachmentsTag.class );
039    
040    @Override
041    public final int doWikiStartTag() {
042        final Engine engine = m_wikiContext.getEngine();
043        final Page page = m_wikiContext.getPage();
044        final AttachmentManager mgr = engine.getManager( AttachmentManager.class );
045
046        try {
047            if( page != null && engine.getManager( PageManager.class ).wikiPageExists(page) && mgr.attachmentsEnabled() ) {
048                if( mgr.hasAttachments(page) ) {
049                    return EVAL_BODY_INCLUDE;
050                }
051            }
052        } catch( final ProviderException e ) {
053            LOG.fatal("Provider failed while trying to check for attachements",e);
054            // FIXME: THrow something.
055        }
056
057        return SKIP_BODY;
058    }
059
060}