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
019package org.apache.oozie.workflow.lite;
020
021import java.util.ArrayList;
022import java.util.List;
023
024/**
025 * Node definition for FORK control node.
026 */
027public class ForkNodeDef extends ControlNodeDef {
028
029    ForkNodeDef() {
030    }
031
032    public ForkNodeDef(String name, Class<? extends ControlNodeHandler> klass,
033                       List<String> transitions) {
034        super(name, "", klass, transitions);
035    }
036
037    public static class ForkNodeHandler extends NodeHandler {
038
039        public boolean enter(Context context) {
040            return true;
041        }
042
043        // the return list contains (parentExecutionPath/transition#transition)+
044        public List<String> multiExit(Context context) {
045            List<String> transitions = context.getNodeDef().getTransitions();
046            context.setVar(ControlNodeHandler.FORK_COUNT_PREFIX + context.getExecutionPath(), "" + transitions.size());
047
048            List<String> fullTransitions = new ArrayList<String>(transitions.size());
049
050            for (String transition : transitions) {
051                String childExecutionPath = context.createExecutionPath(transition);
052                String fullTransition = context.createFullTransition(childExecutionPath, transition);
053                fullTransitions.add(fullTransition);
054            }
055            return fullTransitions;
056        }
057
058        public String exit(Context context) {
059            throw new UnsupportedOperationException();
060        }
061
062        public void kill(Context context) {
063        }
064
065        public void fail(Context context) {
066        }
067
068    }
069
070}