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.converter.DefaultTypeConverter; 033 import org.apache.camel.processor.ChoiceProcessor; 034 import org.apache.camel.processor.FilterProcessor; 035 import org.apache.camel.spi.RouteContext; 036 import org.apache.camel.util.CollectionStringBuffer; 037 import org.apache.commons.logging.Log; 038 import org.apache.commons.logging.LogFactory; 039 040 /** 041 * Represents an XML <choice/> element 042 * 043 * @version $Revision: 43540 $ 044 */ 045 @XmlRootElement(name = "choice") 046 @XmlAccessorType(XmlAccessType.FIELD) 047 public class ChoiceType extends ProcessorType<ChoiceType> { 048 049 private static final transient Log LOG = LogFactory.getLog(ChoiceType.class); 050 051 @XmlElementRef 052 private List<WhenType> whenClauses = new ArrayList<WhenType>(); 053 @XmlElement(required = false) 054 private OtherwiseType otherwise; 055 056 @Override 057 public String toString() { 058 if (getOtherwise() != null) { 059 return "Choice[ " + getWhenClauses() + " " + getOtherwise() + "]"; 060 } else { 061 return "Choice[ " + getWhenClauses() + "]"; 062 063 } 064 } 065 @Override 066 public String getShortName() { 067 return "choice"; 068 } 069 070 @Override 071 public Processor createProcessor(RouteContext routeContext) throws Exception { 072 List<FilterProcessor> filters = new ArrayList<FilterProcessor>(); 073 for (WhenType whenClaus : whenClauses) { 074 filters.add(whenClaus.createProcessor(routeContext)); 075 } 076 Processor otherwiseProcessor = null; 077 if (otherwise != null) { 078 otherwiseProcessor = otherwise.createProcessor(routeContext); 079 } else { 080 LOG.warn("No otherwise clause was specified for a choice block -- any unmatched exchanges will be dropped"); 081 } 082 return new ChoiceProcessor(filters, otherwiseProcessor); 083 } 084 085 // Fluent API 086 // ------------------------------------------------------------------------- 087 public ChoiceType when(Predicate predicate) { 088 getWhenClauses().add(new WhenType(predicate)); 089 return this; 090 } 091 092 093 public ExpressionClause<ChoiceType> when() { 094 WhenType when = new WhenType(); 095 getWhenClauses().add(when); 096 ExpressionClause<ChoiceType> clause = new ExpressionClause<ChoiceType>(this); 097 when.setExpression(clause); 098 return clause; 099 } 100 101 102 public ChoiceType otherwise() { 103 OtherwiseType answer = new OtherwiseType(); 104 setOtherwise(answer); 105 return this; 106 } 107 108 // Properties 109 // ------------------------------------------------------------------------- 110 111 @Override 112 public String getLabel() { 113 CollectionStringBuffer buffer = new CollectionStringBuffer(); 114 List<WhenType> list = getWhenClauses(); 115 for (WhenType whenType : list) { 116 buffer.append(whenType.getLabel()); 117 } 118 return buffer.toString(); 119 } 120 121 public List<WhenType> getWhenClauses() { 122 return whenClauses; 123 } 124 125 public void setWhenClauses(List<WhenType> whenClauses) { 126 this.whenClauses = whenClauses; 127 } 128 129 public List<ProcessorType<?>> getOutputs() { 130 if (otherwise != null) { 131 return otherwise.getOutputs(); 132 } else if (whenClauses.isEmpty()) { 133 return Collections.EMPTY_LIST; 134 } else { 135 WhenType when = whenClauses.get(whenClauses.size() - 1); 136 return when.getOutputs(); 137 } 138 } 139 140 public OtherwiseType getOtherwise() { 141 return otherwise; 142 } 143 144 public void setOtherwise(OtherwiseType otherwise) { 145 this.otherwise = otherwise; 146 } 147 }