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: 750806 $ 043 */ 044 @XmlRootElement(name = "choice") 045 @XmlAccessorType(XmlAccessType.FIELD) 046 public class ChoiceDefinition extends ProcessorDefinition<ChoiceDefinition> { 047 private static final transient Log LOG = LogFactory.getLog(ChoiceDefinition.class); 048 049 @XmlElementRef 050 private List<WhenDefinition> whenClauses = new ArrayList<WhenDefinition>(); 051 @XmlElement(required = false) 052 private OtherwiseDefinition otherwise; 053 054 @Override 055 public String toString() { 056 if (getOtherwise() != null) { 057 return "Choice[" + getWhenClauses() + " " + getOtherwise() + "]"; 058 } else { 059 return "Choice[" + getWhenClauses() + "]"; 060 061 } 062 } 063 @Override 064 public String getShortName() { 065 return "choice"; 066 } 067 068 @Override 069 public Processor createProcessor(RouteContext routeContext) throws Exception { 070 List<FilterProcessor> filters = new ArrayList<FilterProcessor>(); 071 for (WhenDefinition whenClaus : whenClauses) { 072 filters.add(whenClaus.createProcessor(routeContext)); 073 } 074 Processor otherwiseProcessor = null; 075 if (otherwise != null) { 076 otherwiseProcessor = otherwise.createProcessor(routeContext); 077 } else { 078 LOG.warn("No otherwise clause was specified for this choice block: " + this + ", any unmatched exchanges will be dropped."); 079 } 080 return new ChoiceProcessor(filters, otherwiseProcessor); 081 } 082 083 // Fluent API 084 // ------------------------------------------------------------------------- 085 /** 086 * Sets the predicate for the when node 087 * 088 * @param predicate the predicate 089 * @return the builder 090 */ 091 public ChoiceDefinition when(Predicate predicate) { 092 getWhenClauses().add(new WhenDefinition(predicate)); 093 return this; 094 } 095 096 /** 097 * Creates an expression for the when node 098 * 099 * @return expression to be used as builder to configure the when node 100 */ 101 public ExpressionClause<ChoiceDefinition> when() { 102 WhenDefinition when = new WhenDefinition(); 103 getWhenClauses().add(when); 104 ExpressionClause<ChoiceDefinition> clause = new ExpressionClause<ChoiceDefinition>(this); 105 when.setExpression(clause); 106 return clause; 107 } 108 109 /** 110 * Sets the otherwise node 111 * 112 * @return the builder 113 */ 114 public ChoiceDefinition otherwise() { 115 OtherwiseDefinition answer = new OtherwiseDefinition(); 116 setOtherwise(answer); 117 return this; 118 } 119 120 // Properties 121 // ------------------------------------------------------------------------- 122 123 @Override 124 public String getLabel() { 125 CollectionStringBuffer buffer = new CollectionStringBuffer(); 126 List<WhenDefinition> list = getWhenClauses(); 127 for (WhenDefinition whenType : list) { 128 buffer.append(whenType.getLabel()); 129 } 130 return buffer.toString(); 131 } 132 133 public List<WhenDefinition> getWhenClauses() { 134 return whenClauses; 135 } 136 137 public void setWhenClauses(List<WhenDefinition> whenClauses) { 138 this.whenClauses = whenClauses; 139 } 140 141 @SuppressWarnings("unchecked") 142 public List<ProcessorDefinition> getOutputs() { 143 if (otherwise != null) { 144 return otherwise.getOutputs(); 145 } else if (whenClauses.isEmpty()) { 146 return Collections.EMPTY_LIST; 147 } else { 148 WhenDefinition when = whenClauses.get(whenClauses.size() - 1); 149 return when.getOutputs(); 150 } 151 } 152 153 public OtherwiseDefinition getOtherwise() { 154 return otherwise; 155 } 156 157 public void setOtherwise(OtherwiseDefinition otherwise) { 158 this.otherwise = otherwise; 159 } 160 }