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 */
018package org.apache.oozie.workflow.lite;
019
020import org.apache.oozie.workflow.WorkflowException;
021import org.apache.oozie.ErrorCode;
022
023
024//TODO javadoc
025public 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}