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.util; 018 019 import java.util.ArrayList; 020 import java.util.Iterator; 021 import java.util.List; 022 023 import org.apache.camel.model.ChoiceDefinition; 024 import org.apache.camel.model.ProcessorDefinition; 025 import org.apache.camel.model.SendDefinition; 026 import org.apache.camel.model.WhenDefinition; 027 028 /** 029 * Helper class for ProcessorType and the other model classes. 030 */ 031 public final class ProcessorDefinitionHelper { 032 033 private ProcessorDefinitionHelper() { 034 } 035 036 /** 037 * Looks for the given type in the list of outputs and recurring all the children as well. 038 * 039 * @param outputs list of outputs, can be null or empty. 040 * @param type the type to look for 041 * @return the found definitions, or <tt>null</tt> if not found 042 */ 043 public static <T> Iterator<T> filterTypeInOutputs(List<ProcessorDefinition> outputs, Class<T> type) { 044 List<T> found = new ArrayList<T>(); 045 doFindType(outputs, type, found); 046 return found.iterator(); 047 } 048 049 /** 050 * Looks for the given type in the list of outputs and recurring all the children as well. 051 * Will stop at first found and return it. 052 * 053 * @param outputs list of outputs, can be null or empty. 054 * @param type the type to look for 055 * @return the first found type, or <tt>null</tt> if not found 056 */ 057 public static <T> T findFirstTypeInOutputs(List<ProcessorDefinition> outputs, Class<T> type) { 058 List<T> found = new ArrayList<T>(); 059 doFindType(outputs, type, found); 060 if (found.isEmpty()) { 061 return null; 062 } 063 return found.iterator().next(); 064 } 065 066 @SuppressWarnings("unchecked") 067 private static void doFindType(List<ProcessorDefinition> outputs, Class<?> type, List found) { 068 if (outputs == null || outputs.isEmpty()) { 069 return; 070 } 071 072 for (ProcessorDefinition out : outputs) { 073 if (type.isInstance(out)) { 074 found.add(out); 075 } 076 077 // send is much common 078 if (out instanceof SendDefinition) { 079 SendDefinition send = (SendDefinition) out; 080 List<ProcessorDefinition> children = send.getOutputs(); 081 doFindType(children, type, found); 082 } 083 084 // special for choice 085 if (out instanceof ChoiceDefinition) { 086 ChoiceDefinition choice = (ChoiceDefinition) out; 087 for (WhenDefinition when : choice.getWhenClauses()) { 088 List<ProcessorDefinition> children = when.getOutputs(); 089 doFindType(children, type, found); 090 } 091 092 // otherwise is optional 093 if (choice.getOtherwise() != null) { 094 List<ProcessorDefinition> children = choice.getOtherwise().getOutputs(); 095 doFindType(children, type, found); 096 } 097 } 098 099 // try children as well 100 List<ProcessorDefinition> children = out.getOutputs(); 101 doFindType(children, type, found); 102 } 103 } 104 105 }