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: 62995 $ 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 public ExpressionClause<ChoiceType> when() { 092 WhenType when = new WhenType(); 093 getWhenClauses().add(when); 094 ExpressionClause<ChoiceType> clause = new ExpressionClause<ChoiceType>(this); 095 when.setExpression(clause); 096 return clause; 097 } 098 099 public ChoiceType otherwise() { 100 OtherwiseType answer = new OtherwiseType(); 101 setOtherwise(answer); 102 return this; 103 } 104 105 // Properties 106 // ------------------------------------------------------------------------- 107 108 @Override 109 public String getLabel() { 110 CollectionStringBuffer buffer = new CollectionStringBuffer(); 111 List<WhenType> list = getWhenClauses(); 112 for (WhenType whenType : list) { 113 buffer.append(whenType.getLabel()); 114 } 115 return buffer.toString(); 116 } 117 118 public List<WhenType> getWhenClauses() { 119 return whenClauses; 120 } 121 122 public void setWhenClauses(List<WhenType> whenClauses) { 123 this.whenClauses = whenClauses; 124 } 125 126 public List<ProcessorType<?>> getOutputs() { 127 if (otherwise != null) { 128 return otherwise.getOutputs(); 129 } else if (whenClauses.isEmpty()) { 130 return Collections.EMPTY_LIST; 131 } else { 132 WhenType when = whenClauses.get(whenClauses.size() - 1); 133 return when.getOutputs(); 134 } 135 } 136 137 public OtherwiseType getOtherwise() { 138 return otherwise; 139 } 140 141 public void setOtherwise(OtherwiseType otherwise) { 142 this.otherwise = otherwise; 143 } 144 }