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 */
018package org.apache.oozie.workflow.lite;
019
020import java.util.ArrayList;
021import java.util.List;
022
023/**
024 * Node definition for FORK control node.
025 */
026public 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}