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 import org.apache.commons.logging.Log; 037 import org.apache.commons.logging.LogFactory; 038 039 /** 040 * Represents an XML <choice/> element 041 * 042 * @version $Revision: 61064 $ 043 */ 044 @XmlRootElement(name = "choice") 045 @XmlAccessorType(XmlAccessType.FIELD) 046 public class ChoiceType extends ProcessorType<ChoiceType> { 047 048 private static final transient Log LOG = LogFactory.getLog(ChoiceType.class); 049 050 @XmlElementRef 051 private List<WhenType> whenClauses = new ArrayList<WhenType>(); 052 @XmlElement(required = false) 053 private OtherwiseType otherwise; 054 055 @Override 056 public String toString() { 057 if (getOtherwise() != null) { 058 return "Choice[" + getWhenClauses() + " " + getOtherwise() + "]"; 059 } else { 060 return "Choice[" + getWhenClauses() + "]"; 061 062 } 063 } 064 @Override 065 public String getShortName() { 066 return "choice"; 067 } 068 069 @Override 070 public Processor createProcessor(RouteContext routeContext) throws Exception { 071 List<FilterProcessor> filters = new ArrayList<FilterProcessor>(); 072 for (WhenType whenClaus : whenClauses) { 073 filters.add(whenClaus.createProcessor(routeContext)); 074 } 075 Processor otherwiseProcessor = null; 076 if (otherwise != null) { 077 otherwiseProcessor = otherwise.createProcessor(routeContext); 078 } else { 079 LOG.warn("No otherwise clause was specified for a choice block -- any unmatched exchanges will be dropped"); 080 } 081 return new ChoiceProcessor(filters, otherwiseProcessor); 082 } 083 084 // Fluent API 085 // ------------------------------------------------------------------------- 086 public ChoiceType when(Predicate predicate) { 087 getWhenClauses().add(new WhenType(predicate)); 088 return this; 089 } 090 091 092 public ExpressionClause<ChoiceType> when() { 093 WhenType when = new WhenType(); 094 getWhenClauses().add(when); 095 ExpressionClause<ChoiceType> clause = new ExpressionClause<ChoiceType>(this); 096 when.setExpression(clause); 097 return clause; 098 } 099 100 101 public ChoiceType otherwise() { 102 OtherwiseType answer = new OtherwiseType(); 103 setOtherwise(answer); 104 return this; 105 } 106 107 // Properties 108 // ------------------------------------------------------------------------- 109 110 @Override 111 public String getLabel() { 112 CollectionStringBuffer buffer = new CollectionStringBuffer(); 113 List<WhenType> list = getWhenClauses(); 114 for (WhenType whenType : list) { 115 buffer.append(whenType.getLabel()); 116 } 117 return buffer.toString(); 118 } 119 120 public List<WhenType> getWhenClauses() { 121 return whenClauses; 122 } 123 124 public void setWhenClauses(List<WhenType> whenClauses) { 125 this.whenClauses = whenClauses; 126 } 127 128 public List<ProcessorType<?>> getOutputs() { 129 if (otherwise != null) { 130 return otherwise.getOutputs(); 131 } else if (whenClauses.isEmpty()) { 132 return Collections.EMPTY_LIST; 133 } else { 134 WhenType when = whenClauses.get(whenClauses.size() - 1); 135 return when.getOutputs(); 136 } 137 } 138 139 public OtherwiseType getOtherwise() { 140 return otherwise; 141 } 142 143 public void setOtherwise(OtherwiseType otherwise) { 144 this.otherwise = otherwise; 145 } 146 }