    001// Copyright 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.util.List;
    018
    019import org.apache.tapestry5.commons.ObjectCreator;
    020import org.apache.tapestry5.ioc.ServiceAdvisor;
    021import org.apache.tapestry5.ioc.def.ServiceDef3;
    022import org.apache.tapestry5.ioc.services.AspectDecorator;
    023import org.apache.tapestry5.ioc.services.AspectInterceptorBuilder;
    024
    025/**
    026 * Equivalent of {@link org.apache.tapestry5.ioc.internal.InterceptorStackBuilder}, but works using an
    027 * {@link org.apache.tapestry5.ioc.services.AspectInterceptorBuilder} that receives advice from
    028 * {@link org.apache.tapestry5.ioc.ServiceAdvisor}s.
    029 *
    030 * @since 5.1.0.0
    031 */
    032public class AdvisorStackBuilder implements ObjectCreator
    033{
    034    private final ServiceDef3 serviceDef;
    035
    036    private final ObjectCreator delegate;
    037
    038    private final AspectDecorator aspectDecorator;
    039
    040    private final InternalRegistry registry;
    041
    042    /**
    043     * @param serviceDef
    044     *            the service that is ultimately being constructed
    045     * @param delegate
    046     *            responsible for creating the object to be decorated
    047     * @param aspectDecorator
    048     *            used to create the {@link org.apache.tapestry5.ioc.services.AspectInterceptorBuilder} passed to each
    049     *            {@link org.apache.tapestry5.ioc.ServiceAdvisor}
    050     * @param registry
    051     */
    052    public AdvisorStackBuilder(ServiceDef3 serviceDef, ObjectCreator delegate, AspectDecorator aspectDecorator,
    053            InternalRegistry registry)
    054    {
    055        this.serviceDef = serviceDef;
    056        this.delegate = delegate;
    057        this.registry = registry;
    058        this.aspectDecorator = aspectDecorator;
    059    }
    060
    061    @Override
    062    public Object createObject()
    063    {
    064        Object service = delegate.createObject();
    065
    066        List<ServiceAdvisor> advisors = registry.findAdvisorsForService(serviceDef);
    067
    068        if (advisors.isEmpty())
    069            return service;
    070
    071        final AspectInterceptorBuilder builder = aspectDecorator.createBuilder(serviceDef.getServiceInterface(),
    072                service, serviceDef, String.format("<AspectProxy for %s(%s)>", serviceDef.getServiceId(), serviceDef
    073                        .getServiceInterface().getName()));
    074
    075        for (final ServiceAdvisor advisor : advisors)
    076        {
    077            registry.run("Invoking " + advisor, new Runnable()
    078            {
    079                @Override
    080                public void run()
    081                {
    082                    advisor.advise(builder);
    083                }
    084            });
    085        }
    086
    087        return builder.build();
    088    }
    089}