/*

  * 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.commons.flatfile.entityfactory;

 import java.util.Map;

 import org.apache.commons.flatfile.Entity;

 import org.apache.commons.flatfile.EntityFactory;

 /**

  * Stores prototype entities in a Map and returns cloned Entities.

  * @version $Revision: 757266 $ $Date: 2009-03-22 17:12:27 -0500 (Sun, 22 Mar 2009) $

  */

 public class CloningEntityFactory implements EntityFactory {

     private Map<? extends Object, ? extends Entity> lookup;

     /**

      * Create a new CloningEntityFactory.

      * @param lookup lookup Map

      */

     public CloningEntityFactory(Map<? extends Object, ? extends Entity> lookup) {

         if (lookup == null) {

             throw new IllegalArgumentException("null lookup Map");

         }

         this.lookup = lookup;

     }

     /**

      * {@inheritDoc}

      */

     public Entity getEntity(Object cue) {

         Entity prototype = lookup.get(cue);

         return prototype == null ? null : prototype.clone();

     }

 }