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.lang.reflect.Method;
025
026import org.jboss.seam.Component;
027import org.jboss.seam.ScopeType;
028import org.jboss.seam.annotations.intercept.Interceptor;
029import org.jboss.seam.core.BijectionInterceptor;
030import org.jboss.seam.intercept.AbstractInterceptor;
031import org.jboss.seam.intercept.InvocationContext;
032import org.nuxeo.ecm.core.api.DocumentModel;
033import org.nuxeo.ecm.platform.ui.web.api.NavigationContext;
034
035/**
036 * Interceptor used for automatic injection/invalidation tied to currentDocumentModel
037 *
038 * @author tiry
039 */
040@Interceptor(stateless = true, within = BijectionInterceptor.class)
041public class DocumentContextInvalidatorInterceptor extends AbstractInterceptor {
042
043    private static final long serialVersionUID = 1L;
044
045    @Override
046    public Object aroundInvoke(InvocationContext invocationContext) throws Exception { // stupid Seam API
047        beforeInvocation(invocationContext);
048        return invocationContext.proceed();
049    }
050
051    private void beforeInvocation(InvocationContext invocationContext) {
052        Object target = invocationContext.getTarget();
053        for (Method meth : target.getClass().getMethods()) {
054            if (meth.isAnnotationPresent(DocumentContextInvalidation.class)) {
055                doInvalidationCall(target, meth);
056            }
057        }
058    }
059
060    private void doInvalidationCall(Object target, Method meth) {
061        try {
062            if (meth.getParameterTypes().length == 0) {
063                meth.invoke(target);
064            } else {
065                DocumentModel currentDoc = getCurrentDocumentModel();
066                // currentDoc may be null, it's ok
067                meth.invoke(target, currentDoc);
068            }
069        } catch (ReflectiveOperationException e) {
070            throw new RuntimeException(e);
071        }
072    }
073
074    private DocumentModel getCurrentDocumentModel() {
075        NavigationContext navigationContext = (NavigationContext) Component.getInstance("navigationContext",
076                ScopeType.CONVERSATION);
077        return navigationContext.getCurrentDocument();
078    }
079
080    @Override
081    public boolean isInterceptorEnabled() {
082        return true;
083    }
084
085}