    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
    015package org.apache.tapestry5.ioc.internal;
    016
    017import java.lang.reflect.Method;
    018import java.util.Map;
    019
    020import org.apache.tapestry5.commons.services.PlasticProxyFactory;
    021import org.apache.tapestry5.commons.util.CollectionFactory;
    022import org.apache.tapestry5.ioc.ModuleBuilderSource;
    023import org.apache.tapestry5.ioc.ServiceDecorator;
    024import org.apache.tapestry5.ioc.ServiceResources;
    025import org.apache.tapestry5.ioc.internal.util.InjectionResources;
    026import org.apache.tapestry5.ioc.internal.util.MapInjectionResources;
    027
    028/**
    029 * A wrapper around a decorator method.
    030 */
    031public 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    @Override
    041    public Object createInterceptor(Object delegate)
    042    {
    043        // Create a copy of the parameters map so that Object.class points to the delegate instance.
    044
    045        Map<Class, Object> resources = CollectionFactory.newMap(this.resourcesDefaults);
    046
    047        resources.put(Object.class, delegate);
    048        resources.put(serviceInterface, delegate);
    049
    050        InjectionResources injectionResources = new MapInjectionResources(resources);
    051
    052        Object result = invoke(injectionResources);
    053
    054        if (result != null && !serviceInterface.isInstance(result)) { throw new RuntimeException(
    055                IOCMessages.decoratorReturnedWrongType(method, serviceId, result, serviceInterface)); }
    056
    057        return result;
    058    }
    059
    060}