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    
015    package org.apache.tapestry5.internal.bindings;
016    
017    import org.apache.tapestry5.Binding;
018    import org.apache.tapestry5.ComponentResources;
019    import org.apache.tapestry5.NullFieldStrategy;
020    import org.apache.tapestry5.ioc.Location;
021    import org.apache.tapestry5.services.BindingFactory;
022    import 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     */
028    public 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    }