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.internal.util.CollectionFactory;
019import org.apache.tapestry5.ioc.services.PlasticProxyFactory;
020import org.apache.tapestry5.plastic.InstructionBuilder;
021import org.apache.tapestry5.plastic.InstructionBuilderCallback;
022import org.apache.tapestry5.plastic.MethodDescription;
023import org.apache.tapestry5.plastic.PlasticClass;
024import org.apache.tapestry5.plastic.PlasticClassTransformation;
025import org.apache.tapestry5.plastic.PlasticField;
026
027import java.lang.reflect.Method;
028import java.util.Arrays;
029import java.util.Set;
030
031@SuppressWarnings("all")
032public class AspectInterceptorBuilderImpl<T> extends AbtractAspectInterceptorBuilder<T>
033{
034    private final Class<T> serviceInterface;
035
036    private final Set<Method> allMethods = CollectionFactory.newSet();
037
038    private final PlasticClassTransformation transformation;
039
040    private final PlasticClass plasticClass;
041
042    public AspectInterceptorBuilderImpl(AnnotationAccess annotationAccess, PlasticProxyFactory plasticProxyFactory,
043                                        Class<T> serviceInterface, T delegate, String description)
044    {
045        super(annotationAccess);
046
047        this.serviceInterface = serviceInterface;
048
049        final Class<? extends Object> delegateType = delegate.getClass();
050        transformation = plasticProxyFactory.createProxyTransformation(serviceInterface, (Class<? extends T>) delegateType);
051        plasticClass = transformation.getPlasticClass();
052
053        plasticClass.addToString(description);
054
055        allMethods.addAll(Arrays.asList(serviceInterface.getMethods()));
056
057        final PlasticField delegateField = plasticClass.introduceField(serviceInterface, "delegate").inject(delegate);
058
059        for (Method method : allMethods)
060        {
061            plasticClass.introduceMethod(method).delegateTo(delegateField);
062        }
063        
064        // TAP5-2235
065        final String delegateTypeName = delegateType.getName();
066        MethodDescription getDelegateMethodDescription = 
067                new MethodDescription(delegateTypeName, PlasticProxyFactoryImpl.INTERNAL_GET_DELEGATE);
068        plasticClass.introduceMethod(getDelegateMethodDescription, new InstructionBuilderCallback()
069        {
070            public void doBuild(InstructionBuilder builder)
071            {
072                builder.loadThis().getField(delegateField);
073                builder.checkcast(delegateType).returnResult();
074            }
075        });
076    }
077
078    public void adviseMethod(Method method, org.apache.tapestry5.plastic.MethodAdvice advice)
079    {
080        assert method != null;
081        assert advice != null;
082
083        if (!allMethods.contains(method))
084            throw new IllegalArgumentException(String.format("Method %s is not defined for interface %s.", method,
085                    serviceInterface));
086
087        plasticClass.introduceMethod(method).addAdvice(advice);
088    }
089
090    public void adviseAllMethods(org.apache.tapestry5.plastic.MethodAdvice advice)
091    {
092        for (Method m : serviceInterface.getMethods())
093        {
094            adviseMethod(m, advice);
095        }
096    }
097
098    public Class getInterface()
099    {
100        return serviceInterface;
101    }
102
103    public T build()
104    {
105        return (T) transformation.createInstantiator().newInstance();
106    }
107}