001/*
002 * (C) Copyright 2012 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 *     Thierry Delprat
018 */
019package org.nuxeo.template.listeners;
020
021import org.jboss.seam.faces.FacesMessages;
022import org.jboss.seam.international.StatusMessage;
023import org.nuxeo.ecm.core.api.DocumentModel;
024import org.nuxeo.ecm.core.api.event.DocumentEventTypes;
025import org.nuxeo.ecm.core.event.Event;
026import org.nuxeo.ecm.core.event.EventContext;
027import org.nuxeo.ecm.core.event.EventListener;
028import org.nuxeo.ecm.core.event.impl.DocumentEventContext;
029import org.nuxeo.runtime.api.Framework;
030import org.nuxeo.runtime.transaction.TransactionHelper;
031import org.nuxeo.template.api.adapters.TemplateSourceDocument;
032
033public class TemplateDeletionGuard implements EventListener {
034
035    @Override
036    public void handleEvent(Event event) {
037
038        EventContext ctx = event.getContext();
039
040        if (DocumentEventTypes.ABOUT_TO_REMOVE.equals(event.getName())) {
041            if (ctx instanceof DocumentEventContext) {
042                DocumentEventContext docCtx = (DocumentEventContext) ctx;
043                DocumentModel targetDoc = docCtx.getSourceDocument();
044
045                TemplateSourceDocument templateDoc = targetDoc.getAdapter(TemplateSourceDocument.class);
046                if (templateDoc != null && !Framework.isTestModeSet()) {
047                    if (templateDoc.getTemplateBasedDocuments().size() > 0) {
048                        TransactionHelper.setTransactionRollbackOnly();
049                        event.cancel();
050                        // XXX should do better
051                        FacesMessages.instance().clearGlobalMessages();
052                        FacesMessages.instance().addFromResourceBundleOrDefault(StatusMessage.Severity.WARN,
053                                "label.template.canNotDeletedATemplateInUse",
054                                "Can not delete a template that is still in use.");
055                    }
056                }
057            }
058        }
059    }
060}