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
024import java.util.List;
025
026//TODO javadoc
027public abstract class ActionNodeHandler extends NodeHandler {
028    public static final String OK = "OK";
029    public static final String ERROR = "ERROR";
030
031    @Override
032    public final boolean enter(Context context) throws WorkflowException {
033        start(context);
034        return false;
035    }
036
037    @Override
038    public final String exit(Context context) throws WorkflowException {
039        end(context);
040        List<String> transitions = context.getNodeDef().getTransitions();
041        String signalValue = context.getSignalValue();
042        if (OK.equals(signalValue)) {
043            return transitions.get(0);
044        }
045        else {
046            if (ERROR.equals(signalValue)) {
047                return transitions.get(1);
048            }
049        }
050        throw new WorkflowException(ErrorCode.E0722, context.getNodeDef().getName());
051    }
052
053    public abstract void start(Context context) throws WorkflowException;
054
055    public abstract void end(Context context) throws WorkflowException;
056
057}