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.builder;
018
019 import java.util.ArrayList;
020 import java.util.List;
021
022 import org.apache.camel.Predicate;
023 import org.apache.camel.Processor;
024 import org.apache.camel.processor.ChoiceProcessor;
025 import org.apache.camel.processor.FilterProcessor;
026
027 /**
028 * @version $Revision: 532790 $
029 */
030 public class ChoiceBuilder extends FromBuilder {
031
032 private final FromBuilder parent;
033 private List<WhenBuilder> predicateBuilders = new ArrayList<WhenBuilder>();
034 private FromBuilder otherwise;
035
036 public ChoiceBuilder(FromBuilder parent) {
037 super(parent);
038 this.parent = parent;
039 }
040
041 /**
042 * Adds a predicate which if it is true then the message exchange is sent to the given destination
043 *
044 * @return a builder for creating a when predicate clause and action
045 */
046 @Fluent(nestedActions=true)
047 public WhenBuilder when(
048 @FluentArg(value="predicate",element=true)
049 Predicate predicate) {
050 WhenBuilder answer = new WhenBuilder(this, predicate);
051 predicateBuilders.add(answer);
052 return answer;
053 }
054
055 @Fluent(nestedActions=true)
056 public FromBuilder otherwise() {
057 this.otherwise = new FromBuilder(parent);
058 return otherwise;
059 }
060
061 public List<WhenBuilder> getPredicateBuilders() {
062 return predicateBuilders;
063 }
064
065 public FromBuilder getOtherwise() {
066 return otherwise;
067 }
068
069 @Override
070 public Processor createProcessor() throws Exception {
071 List<FilterProcessor> filters = new ArrayList<FilterProcessor>();
072 for (WhenBuilder predicateBuilder : predicateBuilders) {
073 filters.add(predicateBuilder.createProcessor());
074 }
075 Processor otherwiseProcessor = null;
076 if (otherwise != null) {
077 otherwiseProcessor = otherwise.createProcessor();
078 }
079 return new ChoiceProcessor(filters, otherwiseProcessor);
080 }
081 }