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    package org.apache.oozie.workflow.lite;
019    
020    import org.apache.oozie.workflow.WorkflowException;
021    import org.apache.oozie.ErrorCode;
022    
023    import java.util.List;
024    
025    //TODO javadoc
026    public 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    }