    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
    015package org.apache.tapestry5.internal.services;
    016
    017import org.apache.tapestry5.internal.plastic.PlasticInternalUtils;
    018import org.apache.tapestry5.ioc.annotations.PostInjection;
    019import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
    020import org.apache.tapestry5.ioc.services.PlasticProxyFactory;
    021import org.apache.tapestry5.ioc.services.TypeCoercer;
    022import org.apache.tapestry5.services.ComponentClasses;
    023import org.apache.tapestry5.services.ComponentLayer;
    024import org.apache.tapestry5.services.InvalidationEventHub;
    025import org.apache.tapestry5.services.InvalidationListener;
    026
    027import javax.annotation.PostConstruct;
    028import java.util.Map;
    029
    030public class ComponentClassCacheImpl implements ComponentClassCache
    031{
    032    private final Map<String, Class> cache = CollectionFactory.newConcurrentMap();
    033
    034    private final PlasticProxyFactory plasticFactory;
    035
    036    private final TypeCoercer typeCoercer;
    037
    038    public ComponentClassCacheImpl(@ComponentLayer
    039    PlasticProxyFactory plasticFactory, TypeCoercer typeCoercer)
    040    {
    041        this.plasticFactory = plasticFactory;
    042        this.typeCoercer = typeCoercer;
    043    }
    044
    045    @PostInjection
    046    public void setupInvalidation(@ComponentClasses InvalidationEventHub hub) {
    047        hub.clearOnInvalidation(cache);
    048    }
    049
    050    @SuppressWarnings("unchecked")
    051    public Object defaultValueForType(String className)
    052    {
    053        Class clazz = forName(className);
    054
    055        if (!clazz.isPrimitive())
    056            return null;
    057
    058        // Remembering that 0 coerces to boolean false, this covers all the primitive
    059        // types (boolean, int, short, etc.)
    060        return typeCoercer.coerce(0, clazz);
    061    }
    062
    063    public Class forName(String className)
    064    {
    065        Class result = cache.get(className);
    066
    067        if (result == null)
    068        {
    069            result = lookupClassForType(className);
    070
    071            cache.put(className, result);
    072        }
    073
    074        return result;
    075    }
    076
    077    private Class lookupClassForType(String className)
    078    {
    079        ClassLoader componentLoader = plasticFactory.getClassLoader();
    080        try
    081        {
    082            return PlasticInternalUtils.toClass(componentLoader, className);
    083        }
    084        catch (ClassNotFoundException ex)
    085        {
    086            throw new RuntimeException(ex);
    087        }
    088    }
    089}