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001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 package org.apache.oozie.workflow.lite;
019
020
021 import org.apache.oozie.workflow.WorkflowException;
022 import org.apache.oozie.util.ParamChecker;
023 import org.apache.oozie.ErrorCode;
024
025 import java.util.ArrayList;
026 import java.util.List;
027
028 /**
029 * Workflow lite start node definition.
030 */
031 public class StartNodeDef extends NodeDef {
032
033 /**
034 * Reserved name fo the start node. <p/> It is an invalid token, it will never match an application node name.
035 */
036 public static final String START = "::start::";
037
038 /**
039 * Default constructor.
040 */
041 public StartNodeDef() {
042 }
043
044 /**
045 * Create a start node definition.
046 *
047 * @param transitionTo transition on workflow start.
048 */
049 public StartNodeDef(String transitionTo) {
050 super(START, null, StartNodeHandler.class, createList(ParamChecker.notEmpty(transitionTo, "transitionTo")));
051 }
052
053 private static List<String> createList(String transition) {
054 List<String> list = new ArrayList<String>();
055 list.add(transition);
056 return list;
057 }
058
059 /**
060 * Start node handler. <p/> It does an immediate transition to the transitionTo node.
061 */
062 public static class StartNodeHandler extends NodeHandler {
063
064 public boolean enter(Context context) throws WorkflowException {
065 if (!context.getSignalValue().equals(StartNodeDef.START)) {
066 throw new WorkflowException(ErrorCode.E0715, context.getSignalValue());
067 }
068 return true;
069 }
070
071 public String exit(Context context) {
072 return context.getNodeDef().getTransitions().get(0);
073 }
074
075 public void kill(Context context) {
076 }
077
078 public void fail(Context context) {
079 }
080 }
081
082 }