/*
    * $Id: VelocityScopeMap.java 942431 2010-05-08 18:05:19Z 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.velocity;
  
  import java.util.HashSet;
  import java.util.Set;
  
  import org.apache.tiles.request.collection.ScopeMap;
  import org.apache.tiles.request.velocity.extractor.VelocityScopeExtractor;
  import org.apache.velocity.context.Context;
  
  /**
   * <p>Private implementation of <code>Map</code> for servlet request
   * attributes.</p>
   *
   * @version $Rev: 942431 $ $Date: 2010-05-09 04:05:19 +1000 (Sun, 09 May 2010) $
   */
  
  final class VelocityScopeMap extends ScopeMap {
  
      /**
       * The request object to use.
       */
      private Context request = null;
  
      /**
       * Constructor.
       *
       * @param request The request object to use.
       */
      public VelocityScopeMap(Context request) {
          super(new VelocityScopeExtractor(request));
          this.request = request;
      }
  
      @Override
      public Object remove(Object key) {
          return request.remove(key);
      }
  
      @Override
      public Object put(String key, Object value) {
          return request.put(key, value);
      }
  
      /** {@inheritDoc} */
      public boolean containsKey(Object key) {
          return request.containsKey(key);
      }
  
  
      /** {@inheritDoc} */
      public boolean isEmpty() {
          return size() < 1;
      }
  
  
      /** {@inheritDoc} */
      public Set<String> keySet() {
          Set<String> set = new HashSet<String>();
          for (Object key : request.getKeys()) {
              set.add((String) key);
          }
          return (set);
      }
  
      /** {@inheritDoc} */
      public int size() {
          return request.getKeys().length;
      }
  }