001    // Copyright 2007, 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 java.util.Map;
018    
019    import org.apache.tapestry5.ValueEncoder;
020    import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
021    import org.apache.tapestry5.ioc.util.StrategyRegistry;
022    import org.apache.tapestry5.services.InvalidationListener;
023    import org.apache.tapestry5.services.ValueEncoderFactory;
024    import org.apache.tapestry5.services.ValueEncoderSource;
025    
026    @SuppressWarnings("all")
027    public class ValueEncoderSourceImpl implements ValueEncoderSource, InvalidationListener
028    {
029        private final StrategyRegistry<ValueEncoderFactory> registry;
030    
031        private final Map<Class, ValueEncoder> cache = CollectionFactory.newConcurrentMap();
032    
033        public ValueEncoderSourceImpl(Map<Class, ValueEncoderFactory> configuration)
034        {
035            registry = StrategyRegistry.newInstance(ValueEncoderFactory.class, configuration);
036        }
037    
038        @SuppressWarnings({"unchecked"})
039        public <T> ValueEncoder<T> getValueEncoder(Class<T> type)
040        {
041            assert type != null;
042            ValueEncoder<T> result = cache.get(type);
043    
044            if (result == null)
045            {
046                ValueEncoderFactory<T> factory = registry.get(type);
047    
048                result = factory.create(type);
049    
050                cache.put(type, result);
051            }
052    
053            return result;
054        }
055    
056        public void objectWasInvalidated()
057        {
058            registry.clearCache();
059            cache.clear();
060        }
061    }