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.ioc.AnnotationAccess;
018import org.apache.tapestry5.ioc.annotations.PreventServiceDecoration;
019import org.apache.tapestry5.ioc.internal.AnnotationAccessImpl;
020import org.apache.tapestry5.ioc.internal.util.InternalUtils;
021import org.apache.tapestry5.ioc.services.AspectDecorator;
022import org.apache.tapestry5.ioc.services.AspectInterceptorBuilder;
023import org.apache.tapestry5.ioc.services.Builtin;
024import org.apache.tapestry5.ioc.services.PlasticProxyFactory;
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    public <T> AspectInterceptorBuilder<T> createBuilder(Class<T> serviceInterface, final T delegate, String description)
040    {
041        return createBuilder(serviceInterface, delegate, new AnnotationAccessImpl(delegate.getClass()), description);
042    }
043
044    public <T> AspectInterceptorBuilder<T> createBuilder(final Class<T> serviceInterface, final T delegate,
045                                                         AnnotationAccess annotationAccess, final String description)
046    {
047        assert serviceInterface != null;
048        assert delegate != null;
049        assert InternalUtils.isNonBlank(description);
050
051        // The inner class here prevents the needless creation of the AspectInterceptorBuilderImpl,
052        // and the various Plastic related overhead, until there's some actual advice.
053
054        return new AbtractAspectInterceptorBuilder<T>(annotationAccess)
055        {
056            private AspectInterceptorBuilder<T> builder;
057
058            public void adviseMethod(Method method, org.apache.tapestry5.plastic.MethodAdvice advice)
059            {
060                getBuilder().adviseMethod(method, advice);
061            }
062
063            public void adviseAllMethods(org.apache.tapestry5.plastic.MethodAdvice advice)
064            {
065                getBuilder().adviseAllMethods(advice);
066            }
067
068            public Class getInterface()
069            {
070                return serviceInterface;
071            }
072
073            public T build()
074            {
075                return builder == null ? delegate : builder.build();
076            }
077
078            private AspectInterceptorBuilder<T> getBuilder()
079            {
080                if (builder == null)
081                    builder = new AspectInterceptorBuilderImpl<T>(annotationAccess, proxyFactory, serviceInterface,
082                            delegate, description);
083
084                return builder;
085            }
086        };
087    }
088}