    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}