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 import org.apache.oozie.workflow.WorkflowException; 021 import org.apache.oozie.ErrorCode; 022 023 024 //TODO javadoc 025 public abstract class DecisionNodeHandler extends NodeHandler { 026 027 @Override 028 public final boolean enter(Context context) throws WorkflowException { 029 start(context); 030 return false; 031 } 032 033 @Override 034 public final String exit(Context context) throws WorkflowException { 035 end(context); 036 String signalValue = context.getSignalValue(); 037 if (context.getNodeDef().getTransitions().contains(signalValue)) { 038 return signalValue; 039 } 040 else { 041 throw new WorkflowException(ErrorCode.E0721, context.getNodeDef().getName(), signalValue); 042 } 043 } 044 045 public abstract void start(Context context) throws WorkflowException; 046 047 public abstract void end(Context context) throws WorkflowException; 048 049 }