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.perspective;
023
024import java.util.Map;
025
026import javax.faces.context.FacesContext;
027
028import org.nuxeo.theme.negotiation.Scheme;
029import org.nuxeo.theme.perspectives.PerspectiveManager;
030
031public final class RequestAttribute implements Scheme {
032
033    public String getOutcome(final Object context) {
034        final Map<String, Object> parameters = ((FacesContext) context).getExternalContext().getRequestMap();
035        final String perspectiveName = (String) parameters.get("org.nuxeo.theme.perspective");
036        if (PerspectiveManager.hasPerspective(perspectiveName)) {
037            return perspectiveName;
038        }
039        return null;
040    }
041}