/*
    * 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.orchestra.dynaForm.lib;
  
  import java.io.Serializable;
  import java.util.Collection;
  import java.util.Map;
  import java.util.Set;
  
  public class DefaultValueMap<K, V> implements Map<K, V>, Serializable
  {
      private static final long serialVersionUID = -1311019539599397096L;
  
      private final Map<K, V> original;
      private final DefaultValueFactory<V> defaultValueFactory;
  
      public static interface DefaultValueFactory<V> extends Serializable
      {
          public V create();
      }
  
      public DefaultValueMap(Map<K, V> original, DefaultValueFactory<V> defaultValueFactory)
      {
          this.original = original;
          this.defaultValueFactory = defaultValueFactory;
      }
  
      public void clear()
      {
          original.clear();
      }
  
      public boolean containsKey(Object key)
      {
          return original.containsKey(key);
      }
  
      public boolean containsValue(Object value)
      {
          return original.containsValue(value);
      }
  
      public Set<Entry<K, V>> entrySet()
      {
          return original.entrySet();
      }
  
      public boolean equals(Object o)
      {
          return original.equals(o);
      }
  
      @SuppressWarnings("unchecked")
      public V get(Object key)
      {
          V ret = original.get(key);
          if (ret == null)
          {
              ret = defaultValueFactory.create();
              original.put((K) key, ret);
          }
  
          return ret;
      }
  
      public int hashCode()
      {
          return original.hashCode();
      }
  
      public boolean isEmpty()
      {
          return original.isEmpty();
      }
  
      public Set<K> keySet()
      {
          return original.keySet();
      }
  
      public V put(K key, V value)
      {
          return original.put(key, value);
     }
 
     public void putAll(Map<? extends K, ? extends V> t)
     {
         original.putAll(t);
     }
 
     public V remove(Object key)
     {
         return original.remove(key);
     }
 
     public int size()
     {
         return original.size();
     }
 
     public Collection<V> values()
     {
         return original.values();
     }
 }