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.ui.web.invalidations;
023
024import java.io.Serializable;
025
026import org.nuxeo.ecm.core.api.DocumentModel;
027
028/**
029 * Base class for Seam beans that use the Automatic invalidation system
030 *
031 * @author tiry
032 */
033public abstract class DocumentContextBoundActionBean implements Serializable {
034
035    private static final long serialVersionUID = 1L;
036
037    private DocumentModel currentDocument;
038
039    protected DocumentModel getCurrentDocument() {
040        return currentDocument;
041    }
042
043    @DocumentContextInvalidation
044    public void onContextChange(DocumentModel doc) {
045        if (doc == null) {
046            currentDocument = null;
047            resetBeanCache(null);
048            return;
049        } else if (currentDocument == null) {
050            currentDocument = doc;
051            resetBeanCache(doc);
052            return;
053        }
054        if (!doc.getRef().equals(currentDocument.getRef())) {
055            currentDocument = doc;
056            resetBeanCache(doc);
057        }
058    }
059
060    protected abstract void resetBeanCache(DocumentModel newCurrentDocumentModel);
061
062}