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
021import org.apache.oozie.workflow.WorkflowException;
022import org.apache.oozie.ErrorCode;
023
024
025//TODO javadoc
026public abstract class DecisionNodeHandler extends NodeHandler {
027
028    @Override
029    public final boolean enter(Context context) throws WorkflowException {
030        start(context);
031        return false;
032    }
033
034    @Override
035    public final String exit(Context context) throws WorkflowException {
036        end(context);
037        String signalValue = context.getSignalValue();
038        if (context.getNodeDef().getTransitions().contains(signalValue)) {
039            return signalValue;
040        }
041        else {
042            throw new WorkflowException(ErrorCode.E0721, context.getNodeDef().getName(), signalValue);
043        }
044    }
045
046    public abstract void start(Context context) throws WorkflowException;
047
048    public abstract void end(Context context) throws WorkflowException;
049
050}