    001    // Copyright 2006, 2007, 2008, 2009, 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.ioc.internal;
    016
    017    import java.lang.reflect.Method;
    018    import java.util.Map;
    019
    020    import org.apache.tapestry5.ioc.ModuleBuilderSource;
    021    import org.apache.tapestry5.ioc.ServiceDecorator;
    022    import org.apache.tapestry5.ioc.ServiceResources;
    023    import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
    024    import org.apache.tapestry5.ioc.internal.util.InjectionResources;
    025    import org.apache.tapestry5.ioc.internal.util.MapInjectionResources;
    026    import org.apache.tapestry5.ioc.services.PlasticProxyFactory;
    027
    028    /**
    029     * A wrapper around a decorator method.
    030     */
    031    public class ServiceDecoratorImpl extends AbstractMethodInvokingInstrumenter implements ServiceDecorator
    032    {
    033
    034        public ServiceDecoratorImpl(Method method, ModuleBuilderSource moduleSource, ServiceResources resources,
    035                PlasticProxyFactory proxyFactory)
    036        {
    037            super(moduleSource, method, resources, proxyFactory);
    038        }
    039
    040        public Object createInterceptor(Object delegate)
    041        {
    042            // Create a copy of the parameters map so that Object.class points to the delegate instance.
    043
    044            Map<Class, Object> resources = CollectionFactory.newMap(this.resourcesDefaults);
    045
    046            resources.put(Object.class, delegate);
    047            resources.put(serviceInterface, delegate);
    048
    049            InjectionResources injectionResources = new MapInjectionResources(resources);
    050
    051            Object result = invoke(injectionResources);
    052
    053            if (result != null && !serviceInterface.isInstance(result)) { throw new RuntimeException(
    054                    IOCMessages.decoratorReturnedWrongType(method, serviceId, result, serviceInterface)); }
    055
    056            return result;
    057        }
    058
    059    }