    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    }