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