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 java.util.ArrayList;
021    import java.util.List;
022    
023    /**
024     * Node definition for FORK control node.
025     */
026    public class ForkNodeDef extends ControlNodeDef {
027    
028        ForkNodeDef() {
029        }
030    
031        public ForkNodeDef(String name, Class<? extends ControlNodeHandler> klass,
032                           List<String> transitions) {
033            super(name, "", klass, transitions);
034        }
035    
036        public static class ForkNodeHandler extends NodeHandler {
037    
038            public boolean enter(Context context) {
039                return true;
040            }
041    
042            // the return list contains (parentExecutionPath/transition#transition)+
043            public List<String> multiExit(Context context) {
044                List<String> transitions = context.getNodeDef().getTransitions();
045                context.setVar(ControlNodeHandler.FORK_COUNT_PREFIX + context.getExecutionPath(), "" + transitions.size());
046    
047                List<String> fullTransitions = new ArrayList<String>(transitions.size());
048    
049                for (String transition : transitions) {
050                    String childExecutionPath = context.createExecutionPath(transition);
051                    String fullTransition = context.createFullTransition(childExecutionPath, transition);
052                    fullTransitions.add(fullTransition);
053                }
054                return fullTransitions;
055            }
056    
057            public String exit(Context context) {
058                throw new UnsupportedOperationException();
059            }
060    
061            public void kill(Context context) {
062            }
063    
064            public void fail(Context context) {
065            }
066    
067        }
068    
069    }