// Copyright  2008 The Apache Software Foundation

 //

 // Licensed 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.tapestry5.internal;

 import org.apache.tapestry5.NullFieldStrategy;

 /**

  * Default strategy, which is to do nothing: null values stay null.

  */

 public class DefaultNullFieldStrategy implements NullFieldStrategy

 {

     /**

      * Returns null.

      */

     public Object replaceToClient()

     {

         return null;

     }

     /**

      * Returns the empty string.

      */

     public String replaceFromClient()

     {

         return null;

     }

 }