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.ui.web.invalidations;
021
022import java.io.Serializable;
023
024import org.nuxeo.ecm.core.api.DocumentModel;
025
026/**
027 * Base class for Seam beans that use the Automatic invalidation system
028 *
029 * @author tiry
030 */
031public abstract class DocumentContextBoundActionBean implements Serializable {
032
033    private static final long serialVersionUID = 1L;
034
035    private DocumentModel currentDocument;
036
037    protected DocumentModel getCurrentDocument() {
038        return currentDocument;
039    }
040
041    @DocumentContextInvalidation
042    public void onContextChange(DocumentModel doc) {
043        if (doc == null) {
044            currentDocument = null;
045            resetBeanCache(null);
046            return;
047        } else if (currentDocument == null) {
048            currentDocument = doc;
049            resetBeanCache(doc);
050            return;
051        }
052        if (!doc.getRef().equals(currentDocument.getRef())) {
053            currentDocument = doc;
054            resetBeanCache(doc);
055        }
056    }
057
058    protected abstract void resetBeanCache(DocumentModel newCurrentDocumentModel);
059
060}