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.List;
020
021 import org.apache.camel.model.ChoiceDefinition;
022 import org.apache.camel.model.ProcessorDefinition;
023 import org.apache.camel.model.WhenDefinition;
024
025 /**
026 * Helper class for ProcessorType and the other model classes.
027 */
028 public final class ProcessorTypeHelper {
029
030 private ProcessorTypeHelper() {
031 }
032
033 /**
034 * Looks for the given type in the list of outputs and recurring all the children as well.
035 * Will stop at first found and return it.
036 *
037 * @param outputs list of outputs, can be null or empty.
038 * @param type the type to look for
039 * @return the first found type, or <tt>null</tt> if not found
040 */
041 @SuppressWarnings("unchecked")
042 public static <T> T findFirstTypeInOutputs(List<ProcessorDefinition> outputs, Class<T> type) {
043 if (outputs == null || outputs.isEmpty()) {
044 return null;
045 }
046
047 for (ProcessorDefinition out : outputs) {
048 if (type.isInstance(out)) {
049 return type.cast(out);
050 }
051
052 // special for choice
053 if (out instanceof ChoiceDefinition) {
054 ChoiceDefinition choice = (ChoiceDefinition) out;
055 for (WhenDefinition when : choice.getWhenClauses()) {
056 List<ProcessorDefinition> children = when.getOutputs();
057 T child = findFirstTypeInOutputs(children, type);
058 if (child != null) {
059 return child;
060 }
061 }
062
063 List<ProcessorDefinition> children = choice.getOtherwise().getOutputs();
064 T child = findFirstTypeInOutputs(children, type);
065 if (child != null) {
066 return child;
067 }
068 }
069
070 // try children as well
071 List<ProcessorDefinition> children = out.getOutputs();
072 T child = findFirstTypeInOutputs(children, type);
073 if (child != null) {
074 return child;
075 }
076 }
077
078 return null;
079 }
080
081 }