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.model; 018 019 import java.util.ArrayList; 020 import java.util.Collections; 021 import java.util.List; 022 023 import javax.xml.bind.annotation.XmlAccessType; 024 import javax.xml.bind.annotation.XmlAccessorType; 025 import javax.xml.bind.annotation.XmlElement; 026 import javax.xml.bind.annotation.XmlElementRef; 027 import javax.xml.bind.annotation.XmlRootElement; 028 029 import org.apache.camel.Predicate; 030 import org.apache.camel.Processor; 031 import org.apache.camel.builder.ExpressionClause; 032 import org.apache.camel.impl.RouteContext; 033 import org.apache.camel.processor.ChoiceProcessor; 034 import org.apache.camel.processor.FilterProcessor; 035 import org.apache.camel.util.CollectionStringBuffer; 036 037 /** 038 * @version $Revision: 36321 $ 039 */ 040 @XmlRootElement(name = "choice") 041 @XmlAccessorType(XmlAccessType.FIELD) 042 public class ChoiceType extends ProcessorType<ChoiceType> { 043 @XmlElementRef 044 private List<WhenType> whenClauses = new ArrayList<WhenType>(); 045 @XmlElement(required = false) 046 private OtherwiseType otherwise; 047 048 @Override 049 public String toString() { 050 return "Choice[ " + getWhenClauses() + " " + getOtherwise() + "]"; 051 } 052 053 @Override 054 public Processor createProcessor(RouteContext routeContext) throws Exception { 055 List<FilterProcessor> filters = new ArrayList<FilterProcessor>(); 056 for (WhenType whenClaus : whenClauses) { 057 filters.add(whenClaus.createProcessor(routeContext)); 058 } 059 Processor otherwiseProcessor = null; 060 if (otherwise != null) { 061 otherwiseProcessor = otherwise.createProcessor(routeContext); 062 } 063 return new ChoiceProcessor(filters, otherwiseProcessor); 064 } 065 066 // Fluent API 067 // ------------------------------------------------------------------------- 068 public ChoiceType when(Predicate predicate) { 069 getWhenClauses().add(new WhenType(predicate)); 070 return this; 071 } 072 073 074 public ExpressionClause<ChoiceType> when() { 075 WhenType when = new WhenType(); 076 getWhenClauses().add(when); 077 ExpressionClause<ChoiceType> clause = new ExpressionClause<ChoiceType>(this); 078 when.setExpression(clause); 079 return clause; 080 } 081 082 083 public ChoiceType otherwise() { 084 OtherwiseType answer = new OtherwiseType(); 085 setOtherwise(answer); 086 return this; 087 } 088 089 // Properties 090 // ------------------------------------------------------------------------- 091 092 @Override 093 public String getLabel() { 094 CollectionStringBuffer buffer = new CollectionStringBuffer(); 095 List<WhenType> list = getWhenClauses(); 096 for (WhenType whenType : list) { 097 buffer.append(whenType.getLabel()); 098 } 099 return buffer.toString(); 100 } 101 102 public List<WhenType> getWhenClauses() { 103 return whenClauses; 104 } 105 106 public void setWhenClauses(List<WhenType> whenClauses) { 107 this.whenClauses = whenClauses; 108 } 109 110 public List<ProcessorType<?>> getOutputs() { 111 if (otherwise != null) { 112 return otherwise.getOutputs(); 113 } else if (whenClauses.isEmpty()) { 114 return Collections.EMPTY_LIST; 115 } else { 116 WhenType when = whenClauses.get(whenClauses.size() - 1); 117 return when.getOutputs(); 118 } 119 } 120 121 public OtherwiseType getOtherwise() { 122 return otherwise; 123 } 124 125 public void setOtherwise(OtherwiseType otherwise) { 126 this.otherwise = otherwise; 127 } 128 }