/*
    * 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.myfaces.flow.impl;
  
  import java.util.Collection;
  import java.util.Map;
  import java.util.Set;
  import javax.faces.context.FacesContext;
  
  /**
   *
   * @author Leonardo Uribe
   */
  class FlowScopeMap implements Map<Object,Object>
  {
      private DefaultFacesFlowProvider _provider;
      
      private String _flowMapKey;
      
      private Map<Object,Object> _delegate;
          
      public FlowScopeMap(DefaultFacesFlowProvider provider, String flowMapKey)
      {
          this._provider = provider;
          this._flowMapKey = flowMapKey;
      }
      
      private Map<Object,Object> getWrapped(boolean create)
      {
          if (_delegate == null)
          {
              String fullToken = DefaultFacesFlowProvider.FLOW_SESSION_MAP_SUBKEY_PREFIX + 
                  DefaultFacesFlowProvider.SEPARATOR_CHAR + _flowMapKey;
              FacesContext context = FacesContext.getCurrentInstance();
              _delegate = _provider.createOrRestoreMap(context, fullToken, create);
          }
          return _delegate;
      }
  
      public int size()
      {
          Map<Object,Object> map = getWrapped(false);
          if (map == null)
          {
              return 0;
          }
          return map.size();
      }
  
      public boolean isEmpty()
      {
          Map<Object,Object> map = getWrapped(false);
          if (map == null)
          {
              return false;
          }
          return map.isEmpty();
      }
  
      public boolean containsKey(Object key)
      {
          Map<Object,Object> map = getWrapped(false);
          if (map == null)
          {
              return false;
          }
          return map.containsKey(key);
      }
  
      public boolean containsValue(Object value)
      {
          Map<Object,Object> map = getWrapped(false);
          if (map == null)
          {
              return false;
          }
          return map.containsValue(value);
      }
  
      public Object get(Object key)
      {
          Map<Object,Object> map = getWrapped(false);
          if (map == null)
         {
             return null;
         }
         return map.get(key);
     }
 
     public Object put(Object key, Object value)
     {
         return getWrapped(true).put(key, value);
     }
 
     public Object remove(Object key)
     {
         Map<Object,Object> map = getWrapped(false);
         if (map == null)
         {
             return null;
         }
         return map.remove(key);
     }
 
     public void putAll(Map<? extends Object, ? extends Object> m)
     {
         getWrapped(true).putAll(m);
     }
 
     public void clear()
     {
         Map<Object,Object> map = getWrapped(false);
         if (map == null)
         {
             return;
         }
         map.clear();
     }
 
     public Set<Object> keySet()
     {
         return getWrapped(true).keySet();
     }
 
     public Collection<Object> values()
     {
         return getWrapped(true).values();
     }
 
     public Set<Entry<Object, Object>> entrySet()
     {
         return getWrapped(true).entrySet();
     }
     
 }