001    // Copyright 2007 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.services.ApplicationStatePersistenceStrategy;
018    import org.apache.tapestry5.services.ApplicationStatePersistenceStrategySource;
019    
020    import java.util.Map;
021    
022    public class ApplicationStatePersistenceStrategySourceImpl implements
023            ApplicationStatePersistenceStrategySource
024    {
025        private final Map<String, ApplicationStatePersistenceStrategy> configuration;
026    
027        public ApplicationStatePersistenceStrategySourceImpl(Map<String, ApplicationStatePersistenceStrategy> configuration)
028        {
029            this.configuration = configuration;
030        }
031    
032        public ApplicationStatePersistenceStrategy get(String name)
033        {
034            ApplicationStatePersistenceStrategy result = configuration.get(name);
035    
036            if (result == null)
037                throw new RuntimeException(ServicesMessages.missingApplicationStatePersistenceStrategy(
038                        name,
039                        configuration.keySet()));
040    
041            return result;
042        }
043    }