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 java.lang.reflect.Method;
018
019import org.apache.tapestry5.ioc.AnnotationAccess;
020import org.apache.tapestry5.ioc.MethodAdvice;
021import org.apache.tapestry5.ioc.annotations.PreventServiceDecoration;
022import org.apache.tapestry5.ioc.internal.AnnotationAccessImpl;
023import org.apache.tapestry5.ioc.internal.util.InternalUtils;
024import org.apache.tapestry5.ioc.services.AspectDecorator;
025import org.apache.tapestry5.ioc.services.AspectInterceptorBuilder;
026import org.apache.tapestry5.ioc.services.Builtin;
027import org.apache.tapestry5.ioc.services.PlasticProxyFactory;
028
029@PreventServiceDecoration
030public class AspectDecoratorImpl implements AspectDecorator
031{
032    private final PlasticProxyFactory proxyFactory;
033
034    public AspectDecoratorImpl(@Builtin
035    PlasticProxyFactory proxyFactory)
036    {
037        this.proxyFactory = proxyFactory;
038    }
039
040    public <T> T build(Class<T> serviceInterface, T delegate, MethodAdvice advice, String description)
041    {
042        assert advice != null;
043        AspectInterceptorBuilder<T> builder = createBuilder(serviceInterface, delegate, description);
044
045        builder.adviseAllMethods(advice);
046
047        return builder.build();
048    }
049
050    public <T> AspectInterceptorBuilder<T> createBuilder(Class<T> serviceInterface, final T delegate, String description)
051    {
052        return createBuilder(serviceInterface, delegate, new AnnotationAccessImpl(serviceInterface), description);
053    }
054
055    public <T> AspectInterceptorBuilder<T> createBuilder(final Class<T> serviceInterface, final T delegate,
056            AnnotationAccess annotationAccess, final String description)
057    {
058        assert serviceInterface != null;
059        assert delegate != null;
060        assert InternalUtils.isNonBlank(description);
061
062        // The inner class here prevents the needless creation of the AspectInterceptorBuilderImpl,
063        // and the various Plastic related overhead, until there's some actual advice.
064
065        return new AbtractAspectInterceptorBuilder<T>(annotationAccess)
066        {
067            private AspectInterceptorBuilder<T> builder;
068
069            public void adviseMethod(Method method, MethodAdvice advice)
070            {
071                getBuilder().adviseMethod(method, advice);
072            }
073
074            public void adviseAllMethods(MethodAdvice advice)
075            {
076                getBuilder().adviseAllMethods(advice);
077            }
078
079            public void adviseMethod(Method method, org.apache.tapestry5.plastic.MethodAdvice advice)
080            {
081                getBuilder().adviseMethod(method, advice);
082            }
083
084            public void adviseAllMethods(org.apache.tapestry5.plastic.MethodAdvice advice)
085            {
086                getBuilder().adviseAllMethods(advice);
087            }
088
089            public Class getInterface()
090            {
091                return serviceInterface;
092            }
093
094            public T build()
095            {
096                return builder == null ? delegate : builder.build();
097            }
098
099            private AspectInterceptorBuilder<T> getBuilder()
100            {
101                if (builder == null)
102                    builder = new AspectInterceptorBuilderImpl<T>(annotationAccess, proxyFactory, serviceInterface,
103                            delegate, description);
104
105                return builder;
106            }
107        };
108    }
109}