001/*
002 * (C) Copyright 2006-2007 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 *     Jean-Marc Orliaguet, Chalmers
018 *
019 * $Id$
020 */
021
022package org.nuxeo.theme.jsf.negotiation.engine;
023
024import javax.faces.context.FacesContext;
025
026import org.nuxeo.theme.ApplicationType;
027import org.nuxeo.theme.Manager;
028import org.nuxeo.theme.ViewDef;
029import org.nuxeo.theme.negotiation.Scheme;
030import org.nuxeo.theme.types.TypeFamily;
031import org.nuxeo.theme.types.TypeRegistry;
032
033public final class ViewId implements Scheme {
034
035    public String getOutcome(final Object context) {
036        final String viewId = ((FacesContext) context).getViewRoot().getViewId();
037        final TypeRegistry typeRegistry = Manager.getTypeRegistry();
038
039        final String applicationPath = ((FacesContext) context).getExternalContext().getRequestContextPath();
040
041        final ApplicationType application = (ApplicationType) typeRegistry.lookup(TypeFamily.APPLICATION,
042                applicationPath);
043        if (application == null) {
044            return null;
045        }
046
047        final ViewDef view = application.getViewById(viewId);
048        if (view == null) {
049            return null;
050        }
051
052        final String engineName = view.getEngine();
053        if (engineName == null) {
054            return null;
055        }
056
057        if (Manager.getTypeRegistry().lookup(TypeFamily.ENGINE, engineName) != null) {
058            return engineName;
059        }
060        return null;
061    }
062}