001 /** 002 * Copyright (c) 2010 Yahoo! Inc. All rights reserved. 003 * Licensed under the Apache License, Version 2.0 (the "License"); 004 * you may not use this file except in compliance with the License. 005 * You may obtain a copy of the License at 006 * 007 * http://www.apache.org/licenses/LICENSE-2.0 008 * 009 * Unless required by applicable law or agreed to in writing, software 010 * distributed under the License is distributed on an "AS IS" BASIS, 011 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 * See the License for the specific language governing permissions and 013 * limitations under the License. See accompanying LICENSE file. 014 */ 015 package org.apache.oozie.workflow.lite; 016 017 import org.apache.oozie.workflow.WorkflowException; 018 import org.apache.oozie.ErrorCode; 019 020 021 //TODO javadoc 022 public abstract class DecisionNodeHandler extends NodeHandler { 023 024 @Override 025 public final boolean enter(Context context) throws WorkflowException { 026 start(context); 027 return false; 028 } 029 030 @Override 031 public final String exit(Context context) throws WorkflowException { 032 end(context); 033 String signalValue = context.getSignalValue(); 034 if (context.getNodeDef().getTransitions().contains(signalValue)) { 035 return signalValue; 036 } 037 else { 038 throw new WorkflowException(ErrorCode.E0721, context.getNodeDef().getName(), signalValue); 039 } 040 } 041 042 public abstract void start(Context context) throws WorkflowException; 043 044 public abstract void end(Context context) throws WorkflowException; 045 046 }