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
023import java.util.List;
024
025//TODO javadoc
026public abstract class ActionNodeHandler extends NodeHandler {
027    public static final String OK = "OK";
028    public static final String ERROR = "ERROR";
029
030    @Override
031    public final boolean enter(Context context) throws WorkflowException {
032        start(context);
033        return false;
034    }
035
036    @Override
037    public final String exit(Context context) throws WorkflowException {
038        end(context);
039        List<String> transitions = context.getNodeDef().getTransitions();
040        String signalValue = context.getSignalValue();
041        if (OK.equals(signalValue)) {
042            return transitions.get(0);
043        }
044        else {
045            if (ERROR.equals(signalValue)) {
046                return transitions.get(1);
047            }
048        }
049        throw new WorkflowException(ErrorCode.E0722, context.getNodeDef().getName());
050    }
051
052    public abstract void start(Context context) throws WorkflowException;
053
054    public abstract void end(Context context) throws WorkflowException;
055
056}