001// Copyright 2008, 2009 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.bindings;
016
017import org.apache.tapestry5.Binding;
018import org.apache.tapestry5.ComponentResources;
019import org.apache.tapestry5.NullFieldStrategy;
020import org.apache.tapestry5.commons.Location;
021import org.apache.tapestry5.services.BindingFactory;
022import org.apache.tapestry5.services.NullFieldStrategySource;
023
024/**
025 * Treats the expression as the name of a {@link org.apache.tapestry5.NullFieldStrategy}, accessed via the {@link
026 * org.apache.tapestry5.services.NullFieldStrategySource} service.
027 */
028public class NullFieldStrategyBindingFactory implements BindingFactory
029{
030    private NullFieldStrategySource strategySource;
031
032    public NullFieldStrategyBindingFactory(NullFieldStrategySource strategySource)
033    {
034        this.strategySource = strategySource;
035    }
036
037    public Binding newBinding(String description, ComponentResources container, ComponentResources component,
038                              String expression, Location location)
039    {
040        NullFieldStrategy strategy = strategySource.get(expression);
041
042        return new LiteralBinding(location, description, strategy);
043    }
044}