    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     * Treats nulls to or from the client as if they were 0's.
    021     */
    022    public class ZeroNullFieldStrategy implements NullFieldStrategy
    023    {
    024        /**
    025         * Returns the value 0.
    026         */
    027        public Object replaceToClient()
    028        {
    029            return 0L;
    030        }
    031
    032        /**
    033         * Returns "0".
    034         */
    035        public String replaceFromClient()
    036        {
    037            return "0";
    038        }
    039    }