    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.beanmodel.services.PlasticProxyFactoryImpl;
    018import org.apache.tapestry5.commons.services.PlasticProxyFactory;
    019import org.apache.tapestry5.commons.util.CollectionFactory;
    020import org.apache.tapestry5.ioc.AnnotationAccess;
    021import org.apache.tapestry5.plastic.InstructionBuilder;
    022import org.apache.tapestry5.plastic.InstructionBuilderCallback;
    023import org.apache.tapestry5.plastic.MethodDescription;
    024import org.apache.tapestry5.plastic.PlasticClass;
    025import org.apache.tapestry5.plastic.PlasticClassTransformation;
    026import org.apache.tapestry5.plastic.PlasticField;
    027
    028import java.lang.reflect.Method;
    029import java.util.Arrays;
    030import java.util.Set;
    031
    032@SuppressWarnings("all")
    033public class AspectInterceptorBuilderImpl<T> extends AbtractAspectInterceptorBuilder<T>
    034{
    035    private final Class<T> serviceInterface;
    036
    037    private final Set<Method> allMethods = CollectionFactory.newSet();
    038
    039    private final PlasticClassTransformation transformation;
    040
    041    private final PlasticClass plasticClass;
    042
    043    public AspectInterceptorBuilderImpl(AnnotationAccess annotationAccess, PlasticProxyFactory plasticProxyFactory,
    044                                        Class<T> serviceInterface, T delegate, String description)
    045    {
    046        super(annotationAccess);
    047
    048        this.serviceInterface = serviceInterface;
    049
    050        final Class<? extends Object> delegateType = delegate.getClass();
    051        transformation = plasticProxyFactory.createProxyTransformation(serviceInterface, (Class<? extends T>) delegateType);
    052        plasticClass = transformation.getPlasticClass();
    053
    054        plasticClass.addToString(description);
    055
    056        allMethods.addAll(Arrays.asList(serviceInterface.getMethods()));
    057
    058        final PlasticField delegateField = plasticClass.introduceField(serviceInterface, "delegate").inject(delegate);
    059
    060        for (Method method : allMethods)
    061        {
    062            plasticClass.introduceMethod(method).delegateTo(delegateField);
    063        }
    064
    065        // TAP5-2235
    066        final String delegateTypeName = delegateType.getName();
    067        MethodDescription getDelegateMethodDescription =
    068                new MethodDescription(delegateTypeName, PlasticProxyFactoryImpl.INTERNAL_GET_DELEGATE);
    069        plasticClass.introduceMethod(getDelegateMethodDescription, new InstructionBuilderCallback()
    070        {
    071            @Override
    072            public void doBuild(InstructionBuilder builder)
    073            {
    074                builder.loadThis().getField(delegateField);
    075                builder.checkcast(delegateType).returnResult();
    076            }
    077        });
    078    }
    079
    080    @Override
    081    public void adviseMethod(Method method, org.apache.tapestry5.plastic.MethodAdvice advice)
    082    {
    083        assert method != null;
    084        assert advice != null;
    085
    086        if (!allMethods.contains(method))
    087            throw new IllegalArgumentException(String.format("Method %s is not defined for interface %s.", method,
    088                    serviceInterface));
    089
    090        plasticClass.introduceMethod(method).addAdvice(advice);
    091    }
    092
    093    @Override
    094    public void adviseAllMethods(org.apache.tapestry5.plastic.MethodAdvice advice)
    095    {
    096        for (Method m : serviceInterface.getMethods())
    097        {
    098            adviseMethod(m, advice);
    099        }
    100    }
    101
    102    @Override
    103    public Class getInterface()
    104    {
    105        return serviceInterface;
    106    }
    107
    108    @Override
    109    public T build()
    110    {
    111        return (T) transformation.createInstantiator().newInstance();
    112    }
    113}