001// Copyright 2007, 2011 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.services;
016
017import org.apache.tapestry5.ioc.internal.util.InternalUtils;
018import org.apache.tapestry5.services.ApplicationStatePersistenceStrategy;
019import org.apache.tapestry5.services.ApplicationStatePersistenceStrategySource;
020
021import java.util.Map;
022
023public class ApplicationStatePersistenceStrategySourceImpl implements
024        ApplicationStatePersistenceStrategySource
025{
026    private final Map<String, ApplicationStatePersistenceStrategy> configuration;
027
028    public ApplicationStatePersistenceStrategySourceImpl(Map<String, ApplicationStatePersistenceStrategy> configuration)
029    {
030        this.configuration = configuration;
031    }
032
033    public ApplicationStatePersistenceStrategy get(String name)
034    {
035        ApplicationStatePersistenceStrategy result = configuration.get(name);
036
037        if (result == null)
038            throw new RuntimeException(String.format("No application state persistence strategy is available with name '%s'. Available strategies: %s.", name, InternalUtils
039                    .joinSorted(configuration.keySet())));
040
041        return result;
042    }
043}