001    // Copyright 2008, 2010, 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    
015    package org.apache.tapestry5.internal.services;
016    
017    import org.apache.tapestry5.internal.plastic.PlasticInternalUtils;
018    import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
019    import org.apache.tapestry5.ioc.services.PlasticProxyFactory;
020    import org.apache.tapestry5.ioc.services.TypeCoercer;
021    import org.apache.tapestry5.services.ComponentLayer;
022    import org.apache.tapestry5.services.InvalidationListener;
023    
024    import java.util.Map;
025    
026    public class ComponentClassCacheImpl implements ComponentClassCache, InvalidationListener
027    {
028        private final Map<String, Class> cache = CollectionFactory.newConcurrentMap();
029    
030        private final PlasticProxyFactory plasticFactory;
031    
032        private final TypeCoercer typeCoercer;
033    
034        public ComponentClassCacheImpl(@ComponentLayer
035        PlasticProxyFactory plasticFactory, TypeCoercer typeCoercer)
036        {
037            this.plasticFactory = plasticFactory;
038            this.typeCoercer = typeCoercer;
039        }
040    
041        public void objectWasInvalidated()
042        {
043            cache.clear();
044        }
045    
046        @SuppressWarnings("unchecked")
047        public Object defaultValueForType(String className)
048        {
049            Class clazz = forName(className);
050    
051            if (!clazz.isPrimitive())
052                return null;
053    
054            // Remembering that 0 coerces to boolean false, this covers all the primitive
055            // types (boolean, int, short, etc.)
056            return typeCoercer.coerce(0, clazz);
057        }
058    
059        public Class forName(String className)
060        {
061            Class result = cache.get(className);
062    
063            if (result == null)
064            {
065                result = lookupClassForType(className);
066    
067                cache.put(className, result);
068            }
069    
070            return result;
071        }
072    
073        private Class lookupClassForType(String className)
074        {
075            ClassLoader componentLoader = plasticFactory.getClassLoader();
076            try
077            {
078                return PlasticInternalUtils.toClass(componentLoader, className);
079            }
080            catch (ClassNotFoundException ex)
081            {
082                throw new RuntimeException(ex);
083            }
084        }
085    }