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    
024    //TODO javadoc
025    public abstract class DecisionNodeHandler extends NodeHandler {
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            String signalValue = context.getSignalValue();
037            if (context.getNodeDef().getTransitions().contains(signalValue)) {
038                return signalValue;
039            }
040            else {
041                throw new WorkflowException(ErrorCode.E0721, context.getNodeDef().getName(), signalValue);
042            }
043        }
044    
045        public abstract void start(Context context) throws WorkflowException;
046    
047        public abstract void end(Context context) throws WorkflowException;
048    
049    }