001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.camel.builder; 018 019 import java.util.ArrayList; 020 import java.util.List; 021 022 import org.apache.camel.Predicate; 023 import org.apache.camel.Processor; 024 import org.apache.camel.processor.ChoiceProcessor; 025 import org.apache.camel.processor.FilterProcessor; 026 027 /** 028 * @version $Revision: 532790 $ 029 */ 030 public class ChoiceBuilder extends FromBuilder { 031 032 private final FromBuilder parent; 033 private List<WhenBuilder> predicateBuilders = new ArrayList<WhenBuilder>(); 034 private FromBuilder otherwise; 035 036 public ChoiceBuilder(FromBuilder parent) { 037 super(parent); 038 this.parent = parent; 039 } 040 041 /** 042 * Adds a predicate which if it is true then the message exchange is sent to the given destination 043 * 044 * @return a builder for creating a when predicate clause and action 045 */ 046 @Fluent(nestedActions=true) 047 public WhenBuilder when( 048 @FluentArg(value="predicate",element=true) 049 Predicate predicate) { 050 WhenBuilder answer = new WhenBuilder(this, predicate); 051 predicateBuilders.add(answer); 052 return answer; 053 } 054 055 @Fluent(nestedActions=true) 056 public FromBuilder otherwise() { 057 this.otherwise = new FromBuilder(parent); 058 return otherwise; 059 } 060 061 public List<WhenBuilder> getPredicateBuilders() { 062 return predicateBuilders; 063 } 064 065 public FromBuilder getOtherwise() { 066 return otherwise; 067 } 068 069 @Override 070 public Processor createProcessor() throws Exception { 071 List<FilterProcessor> filters = new ArrayList<FilterProcessor>(); 072 for (WhenBuilder predicateBuilder : predicateBuilders) { 073 filters.add(predicateBuilder.createProcessor()); 074 } 075 Processor otherwiseProcessor = null; 076 if (otherwise != null) { 077 otherwiseProcessor = otherwise.createProcessor(); 078 } 079 return new ChoiceProcessor(filters, otherwiseProcessor); 080 } 081 }