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
015package org.apache.tapestry5.internal;
016
017import org.apache.tapestry5.NullFieldStrategy;
018
019/**
020 * Treats nulls to or from the client as if they were 0's.
021 */
022public 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}