001/*
002 * (C) Copyright 2006-2009 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Nuxeo - initial API and implementation
018 *
019 * $Id$
020 */
021
022package org.nuxeo.ecm.platform.comment.listener;
023
024import java.util.List;
025
026import org.apache.commons.logging.Log;
027import org.apache.commons.logging.LogFactory;
028import org.nuxeo.ecm.core.api.CoreSession;
029import org.nuxeo.ecm.core.api.DocumentModel;
030import org.nuxeo.ecm.core.api.DocumentNotFoundException;
031import org.nuxeo.ecm.core.event.PostCommitEventListener;
032import org.nuxeo.ecm.platform.comment.service.CommentServiceConfig;
033import org.nuxeo.ecm.platform.relations.api.Graph;
034import org.nuxeo.ecm.platform.relations.api.QNameResource;
035import org.nuxeo.ecm.platform.relations.api.RelationManager;
036import org.nuxeo.ecm.platform.relations.api.Resource;
037import org.nuxeo.ecm.platform.relations.api.Statement;
038
039public class DocumentRemovedCommentEventListener extends AbstractCommentListener implements PostCommitEventListener {
040
041    private static final Log log = LogFactory.getLog(DocumentRemovedCommentEventListener.class);
042
043    @Override
044    protected void doProcess(CoreSession coreSession, RelationManager relationManager, CommentServiceConfig config,
045            DocumentModel docMessage) {
046        log.debug("Processing relations cleanup on Document removal");
047        onDocumentRemoved(coreSession, relationManager, config, docMessage);
048    }
049
050    private static void onDocumentRemoved(CoreSession coreSession, RelationManager relationManager,
051            CommentServiceConfig config, DocumentModel docMessage) {
052
053        Resource documentRes = relationManager.getResource(config.documentNamespace, docMessage, null);
054        if (documentRes == null) {
055            log.error("Could not adapt document model to relation resource ; "
056                    + "check the service relation adapters configuration");
057            return;
058        }
059        Graph graph = relationManager.getGraph(config.graphName, coreSession);
060        List<Statement> statementList = graph.getStatements(null, null, documentRes);
061
062        // remove comments
063        for (Statement stmt : statementList) {
064            QNameResource resource = (QNameResource) stmt.getSubject();
065            String commentId = resource.getLocalName();
066            DocumentModel docModel = (DocumentModel) relationManager.getResourceRepresentation(config.commentNamespace,
067                    resource, null);
068
069            if (docModel != null) {
070                try {
071                    coreSession.removeDocument(docModel.getRef());
072                    log.debug("comment removal succeded for id: " + commentId);
073                } catch (DocumentNotFoundException e) {
074                    log.error("comment removal failed", e);
075                }
076            } else {
077                log.warn("comment not found: id=" + commentId);
078            }
079        }
080        coreSession.save();
081        // remove relations
082        graph.remove(statementList);
083    }
084
085}