001/*
002 * (C) Copyright 2006-2009 Nuxeo SAS (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Nuxeo - initial API and implementation
016 *
017 * $Id$
018 */
019
020package org.nuxeo.ecm.platform.comment.listener;
021
022import java.util.List;
023
024import org.apache.commons.logging.Log;
025import org.apache.commons.logging.LogFactory;
026import org.nuxeo.ecm.core.api.CoreSession;
027import org.nuxeo.ecm.core.api.DocumentModel;
028import org.nuxeo.ecm.core.event.EventListener;
029import org.nuxeo.ecm.platform.comment.service.CommentServiceConfig;
030import org.nuxeo.ecm.platform.comment.workflow.utils.CommentsConstants;
031import org.nuxeo.ecm.platform.relations.api.Graph;
032import org.nuxeo.ecm.platform.relations.api.RelationManager;
033import org.nuxeo.ecm.platform.relations.api.Resource;
034import org.nuxeo.ecm.platform.relations.api.Statement;
035
036public class CommentRemovedEventListener extends AbstractCommentListener implements EventListener {
037
038    private static final Log log = LogFactory.getLog(CommentRemovedEventListener.class);
039
040    @Override
041    protected void doProcess(CoreSession coreSession, RelationManager relationManager, CommentServiceConfig config,
042            DocumentModel docMessage) {
043        log.debug("Processing relations cleanup on Comment removal");
044        String typeName = docMessage.getType();
045        if (CommentsConstants.COMMENT_DOC_TYPE.equals(typeName) || "Post".equals(typeName)) {
046            onCommentRemoved(relationManager, config, docMessage);
047        }
048    }
049
050    private static void onCommentRemoved(RelationManager relationManager, CommentServiceConfig config,
051            DocumentModel docModel) {
052        Resource commentRes = relationManager.getResource(config.commentNamespace, docModel, null);
053        if (commentRes == null) {
054            log.warn("Could not adapt document model to relation resource; "
055                    + "check the service relation adapters configuration");
056            return;
057        }
058        Graph graph = relationManager.getGraphByName(config.graphName);
059        List<Statement> statementList = graph.getStatements(commentRes, null, null);
060        graph.remove(statementList);
061    }
062
063}