    001    // Copyright 2008, 2010 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.services;
    016
    017    import org.apache.tapestry5.NullFieldStrategy;
    018    import org.apache.tapestry5.ioc.util.AvailableValues;
    019    import org.apache.tapestry5.ioc.util.UnknownValueException;
    020    import org.apache.tapestry5.services.NullFieldStrategySource;
    021
    022    import java.util.Map;
    023
    024    public class NullFieldStrategySourceImpl implements NullFieldStrategySource
    025    {
    026        private final Map<String, NullFieldStrategy> configuration;
    027
    028        public NullFieldStrategySourceImpl(Map<String, NullFieldStrategy> configuration)
    029        {
    030            this.configuration = configuration;
    031        }
    032
    033        public NullFieldStrategy get(String name)
    034        {
    035            NullFieldStrategy result = configuration.get(name);
    036
    037            if (result != null) return result;
    038
    039            throw new UnknownValueException(String.format("Unrecognized name '%s' locating a null field strategy.", name),
    040                    new AvailableValues("Configured null field strategies", configuration));
    041
    042        }
    043    }