    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}