001    // Copyright  2008 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.internal;
016    
017    import org.apache.tapestry5.NullFieldStrategy;
018    
019    /**
020     * Default strategy, which is to do nothing: null values stay null.
021     */
022    public class DefaultNullFieldStrategy implements NullFieldStrategy
023    {
024        /**
025         * Returns null.
026         */
027        public Object replaceToClient()
028        {
029            return null;
030        }
031    
032        /**
033         * Returns null .
034         */
035        public String replaceFromClient()
036        {
037            return null;
038        }
039    }