001// Copyright 2006, 2007, 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.util.List; 018 019import org.apache.tapestry5.ioc.services.Builtin; 020import org.apache.tapestry5.ioc.services.DefaultImplementationBuilder; 021import org.apache.tapestry5.ioc.services.PipelineBuilder; 022import org.apache.tapestry5.ioc.services.PlasticProxyFactory; 023import org.slf4j.Logger; 024 025public class PipelineBuilderImpl implements PipelineBuilder 026{ 027 028 private final PlasticProxyFactory proxyFactory; 029 030 private final DefaultImplementationBuilder defaultImplementationBuilder; 031 032 public PipelineBuilderImpl(@Builtin 033 PlasticProxyFactory proxyFactory, 034 035 DefaultImplementationBuilder defaultImplementationBuilder) 036 { 037 this.proxyFactory = proxyFactory; 038 this.defaultImplementationBuilder = defaultImplementationBuilder; 039 } 040 041 public <S, F> S build(Logger logger, Class<S> serviceInterface, Class<F> filterInterface, List<F> filters) 042 { 043 S terminator = defaultImplementationBuilder.createDefaultImplementation(serviceInterface); 044 045 return build(logger, serviceInterface, filterInterface, filters, terminator); 046 } 047 048 public <S, F> S build(Logger logger, Class<S> serviceInterface, Class<F> filterInterface, List<F> filters, 049 S terminator) 050 { 051 if (filters.isEmpty()) 052 return terminator; 053 054 BridgeBuilder<S, F> bb = new BridgeBuilder<S, F>(logger, serviceInterface, filterInterface, proxyFactory); 055 056 // The first bridge will point to the terminator. 057 // Like service decorators, we work deepest (last) 058 // to shallowest (first) 059 060 S next = terminator; 061 int count = filters.size(); 062 063 for (int i = count - 1; i >= 0; i--) 064 { 065 F filter = filters.get(i); 066 067 next = bb.instantiateBridge(next, filter); 068 } 069 070 return next; 071 } 072 073}