001// Copyright 2008, 2009, 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.ioc.internal.services;
016
017import org.apache.tapestry5.commons.services.PlasticProxyFactory;
018import org.apache.tapestry5.ioc.AnnotationAccess;
019import org.apache.tapestry5.ioc.annotations.PreventServiceDecoration;
020import org.apache.tapestry5.ioc.internal.AnnotationAccessImpl;
021import org.apache.tapestry5.ioc.internal.util.InternalUtils;
022import org.apache.tapestry5.ioc.services.AspectDecorator;
023import org.apache.tapestry5.ioc.services.AspectInterceptorBuilder;
024import org.apache.tapestry5.ioc.services.Builtin;
025
026import java.lang.reflect.Method;
027
028@PreventServiceDecoration
029public class AspectDecoratorImpl implements AspectDecorator
030{
031    private final PlasticProxyFactory proxyFactory;
032
033    public AspectDecoratorImpl(@Builtin
034                               PlasticProxyFactory proxyFactory)
035    {
036        this.proxyFactory = proxyFactory;
037    }
038
039    @Override
040    public <T> AspectInterceptorBuilder<T> createBuilder(Class<T> serviceInterface, final T delegate, String description)
041    {
042        return createBuilder(serviceInterface, delegate, new AnnotationAccessImpl(delegate.getClass()), description);
043    }
044
045    @Override
046    public <T> AspectInterceptorBuilder<T> createBuilder(final Class<T> serviceInterface, final T delegate,
047                                                         AnnotationAccess annotationAccess, final String description)
048    {
049        assert serviceInterface != null;
050        assert delegate != null;
051        assert InternalUtils.isNonBlank(description);
052
053        // The inner class here prevents the needless creation of the AspectInterceptorBuilderImpl,
054        // and the various Plastic related overhead, until there's some actual advice.
055
056        return new AbtractAspectInterceptorBuilder<T>(annotationAccess)
057        {
058            private AspectInterceptorBuilder<T> builder;
059
060            @Override
061            public void adviseMethod(Method method, org.apache.tapestry5.plastic.MethodAdvice advice)
062            {
063                getBuilder().adviseMethod(method, advice);
064            }
065
066            @Override
067            public void adviseAllMethods(org.apache.tapestry5.plastic.MethodAdvice advice)
068            {
069                getBuilder().adviseAllMethods(advice);
070            }
071
072            @Override
073            public Class getInterface()
074            {
075                return serviceInterface;
076            }
077
078            @Override
079            public T build()
080            {
081                return builder == null ? delegate : builder.build();
082            }
083
084            private AspectInterceptorBuilder<T> getBuilder()
085            {
086                if (builder == null)
087                    builder = new AspectInterceptorBuilderImpl<T>(annotationAccess, proxyFactory, serviceInterface,
088                            delegate, description);
089
090                return builder;
091            }
092        };
093    }
094}