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.processor.ChoiceProcessor; 033 import org.apache.camel.processor.FilterProcessor; 034 import org.apache.camel.spi.RouteContext; 035 import org.apache.camel.util.CollectionStringBuffer; 036 037 /** 038 * Represents an XML <choice/> element 039 * 040 * @version $Revision: 41908 $ 041 */ 042 @XmlRootElement(name = "choice") 043 @XmlAccessorType(XmlAccessType.FIELD) 044 public class ChoiceType extends ProcessorType<ChoiceType> { 045 @XmlElementRef 046 private List<WhenType> whenClauses = new ArrayList<WhenType>(); 047 @XmlElement(required = false) 048 private OtherwiseType otherwise; 049 050 @Override 051 public String toString() { 052 if (getOtherwise() != null) { 053 return "Choice[ " + getWhenClauses() + " " + getOtherwise() + "]"; 054 } else { 055 return "Choice[ " + getWhenClauses() + "]"; 056 057 } 058 } 059 060 @Override 061 public Processor createProcessor(RouteContext routeContext) throws Exception { 062 List<FilterProcessor> filters = new ArrayList<FilterProcessor>(); 063 for (WhenType whenClaus : whenClauses) { 064 filters.add(whenClaus.createProcessor(routeContext)); 065 } 066 Processor otherwiseProcessor = null; 067 if (otherwise != null) { 068 otherwiseProcessor = otherwise.createProcessor(routeContext); 069 } 070 return new ChoiceProcessor(filters, otherwiseProcessor); 071 } 072 073 // Fluent API 074 // ------------------------------------------------------------------------- 075 public ChoiceType when(Predicate predicate) { 076 getWhenClauses().add(new WhenType(predicate)); 077 return this; 078 } 079 080 081 public ExpressionClause<ChoiceType> when() { 082 WhenType when = new WhenType(); 083 getWhenClauses().add(when); 084 ExpressionClause<ChoiceType> clause = new ExpressionClause<ChoiceType>(this); 085 when.setExpression(clause); 086 return clause; 087 } 088 089 090 public ChoiceType otherwise() { 091 OtherwiseType answer = new OtherwiseType(); 092 setOtherwise(answer); 093 return this; 094 } 095 096 // Properties 097 // ------------------------------------------------------------------------- 098 099 @Override 100 public String getLabel() { 101 CollectionStringBuffer buffer = new CollectionStringBuffer(); 102 List<WhenType> list = getWhenClauses(); 103 for (WhenType whenType : list) { 104 buffer.append(whenType.getLabel()); 105 } 106 return buffer.toString(); 107 } 108 109 public List<WhenType> getWhenClauses() { 110 return whenClauses; 111 } 112 113 public void setWhenClauses(List<WhenType> whenClauses) { 114 this.whenClauses = whenClauses; 115 } 116 117 public List<ProcessorType<?>> getOutputs() { 118 if (otherwise != null) { 119 return otherwise.getOutputs(); 120 } else if (whenClauses.isEmpty()) { 121 return Collections.EMPTY_LIST; 122 } else { 123 WhenType when = whenClauses.get(whenClauses.size() - 1); 124 return when.getOutputs(); 125 } 126 } 127 128 public OtherwiseType getOtherwise() { 129 return otherwise; 130 } 131 132 public void setOtherwise(OtherwiseType otherwise) { 133 this.otherwise = otherwise; 134 } 135 }