001    /**
002     * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
003     * Licensed under the Apache License, Version 2.0 (the "License");
004     * you may not use this file except in compliance with the License.
005     * You may obtain a copy of the License at
006     *
007     *   http://www.apache.org/licenses/LICENSE-2.0
008     *
009     *  Unless required by applicable law or agreed to in writing, software
010     *  distributed under the License is distributed on an "AS IS" BASIS,
011     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012     *  See the License for the specific language governing permissions and
013     *  limitations under the License. See accompanying LICENSE file.
014     */
015    package org.apache.oozie.workflow.lite;
016    
017    import org.apache.oozie.workflow.WorkflowException;
018    import org.apache.oozie.ErrorCode;
019    
020    import java.util.List;
021    
022    //TODO javadoc
023    public abstract class ActionNodeHandler extends NodeHandler {
024        public static final String OK = "OK";
025        public static final String ERROR = "ERROR";
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            List<String> transitions = context.getNodeDef().getTransitions();
037            String signalValue = context.getSignalValue();
038            if (OK.equals(signalValue)) {
039                return transitions.get(0);
040            }
041            else {
042                if (ERROR.equals(signalValue)) {
043                    return transitions.get(1);
044                }
045            }
046            throw new WorkflowException(ErrorCode.E0722, context.getNodeDef().getName());
047        }
048    
049        public abstract void start(Context context) throws WorkflowException;
050    
051        public abstract void end(Context context) throws WorkflowException;
052    
053    }