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
015package org.apache.tapestry5.internal.services;
016
017import java.util.Map;
018
019import org.apache.tapestry5.ValueEncoder;
020import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
021import org.apache.tapestry5.ioc.util.StrategyRegistry;
022import org.apache.tapestry5.services.InvalidationListener;
023import org.apache.tapestry5.services.ValueEncoderFactory;
024import org.apache.tapestry5.services.ValueEncoderSource;
025
026@SuppressWarnings("all")
027public 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}