/*

  * $Id: EnvironmentScopeMap.java 942404 2010-05-08 15:36:51Z apetrelli $

  *

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  * http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

  * KIND, either express or implied.  See the License for the

  * specific language governing permissions and limitations

  * under the License.

  */

 package org.apache.tiles.request.freemarker;

 import java.util.Set;

 import org.apache.tiles.request.collection.ScopeMap;

 import org.apache.tiles.request.freemarker.extractor.EnvironmentScopeExtractor;

 import freemarker.core.Environment;

 import freemarker.template.TemplateModelException;

 /**

  * <p>

  * Private implementation of <code>Map</code> for servlet request attributes.

  * </p>

  *

  * @version $Rev: 942404 $ $Date: 2010-05-09 01:36:51 +1000 (Sun, 09 May 2010) $

  */

 final class EnvironmentScopeMap extends ScopeMap {

     /**

      * The request object to use.

      */

     private Environment request = null;

     /**

      * Constructor.

      *

      * @param request The request object to use.

      */

     public EnvironmentScopeMap(Environment request) {

         super(new EnvironmentScopeExtractor(request));

         this.request = request;

     }

     @SuppressWarnings("unchecked")

     @Override

     public Set<String> keySet() {

         try {

             return request.getKnownVariableNames();

         } catch (TemplateModelException e) {

             throw new FreemarkerRequestException(

                     "Cannot get known variable names", e);

         }

     }

 }