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 019package org.apache.oozie.workflow.lite; 020 021 022import org.apache.oozie.ErrorCode; 023import org.apache.oozie.util.ParamChecker; 024import org.apache.oozie.workflow.WorkflowException; 025 026import java.util.Arrays; 027 028/** 029 * Workflow lite start node definition. 030 */ 031public class StartNodeDef extends ControlNodeDef { 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 klass control node handler class. 048 * @param transitionTo transition on workflow start. 049 */ 050 public StartNodeDef(Class<? extends ControlNodeHandler> klass, String transitionTo) { 051 super(START, "", klass, Arrays.asList(ParamChecker.notEmpty(transitionTo, "transitionTo"))); 052 } 053 054 /** 055 * Start node handler. <p> It does an immediate transition to the transitionTo node. 056 */ 057 public static class StartNodeHandler extends NodeHandler { 058 059 public boolean enter(Context context) throws WorkflowException { 060 if (!context.getSignalValue().equals(StartNodeDef.START)) { 061 throw new WorkflowException(ErrorCode.E0715, context.getSignalValue()); 062 } 063 return true; 064 } 065 066 public String exit(Context context) { 067 return context.getNodeDef().getTransitions().get(0); 068 } 069 070 public void kill(Context context) { 071 } 072 073 public void fail(Context context) { 074 } 075 } 076 077}