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.lang.reflect.Method;
023
024import org.jboss.seam.Component;
025import org.jboss.seam.ScopeType;
026import org.jboss.seam.annotations.intercept.Interceptor;
027import org.jboss.seam.core.BijectionInterceptor;
028import org.jboss.seam.intercept.AbstractInterceptor;
029import org.jboss.seam.intercept.InvocationContext;
030import org.nuxeo.ecm.core.api.DocumentModel;
031import org.nuxeo.ecm.platform.ui.web.api.NavigationContext;
032
033/**
034 * Interceptor used for automatic injection/invalidation tied to currentDocumentModel
035 *
036 * @author tiry
037 */
038@Interceptor(stateless = true, within = BijectionInterceptor.class)
039public class DocumentContextInvalidatorInterceptor extends AbstractInterceptor {
040
041    private static final long serialVersionUID = 1L;
042
043    @Override
044    public Object aroundInvoke(InvocationContext invocationContext) throws Exception { // stupid Seam API
045        beforeInvocation(invocationContext);
046        return invocationContext.proceed();
047    }
048
049    private void beforeInvocation(InvocationContext invocationContext) {
050        Object target = invocationContext.getTarget();
051        for (Method meth : target.getClass().getMethods()) {
052            if (meth.isAnnotationPresent(DocumentContextInvalidation.class)) {
053                doInvalidationCall(target, meth);
054            }
055        }
056    }
057
058    private void doInvalidationCall(Object target, Method meth) {
059        try {
060            if (meth.getParameterTypes().length == 0) {
061                meth.invoke(target);
062            } else {
063                DocumentModel currentDoc = getCurrentDocumentModel();
064                // currentDoc may be null, it's ok
065                meth.invoke(target, currentDoc);
066            }
067        } catch (ReflectiveOperationException e) {
068            throw new RuntimeException(e);
069        }
070    }
071
072    private DocumentModel getCurrentDocumentModel() {
073        NavigationContext navigationContext = (NavigationContext) Component.getInstance("navigationContext",
074                ScopeType.CONVERSATION);
075        return navigationContext.getCurrentDocument();
076    }
077
078    @Override
079    public boolean isInterceptorEnabled() {
080        return true;
081    }
082
083}