001    /**
002     * Copyright 2005-2012 The Kuali Foundation
003     *
004     * Licensed under the Educational Community License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.opensource.org/licenses/ecl2.php
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.kuali.rice.kew.engine.transition;
017    
018    import org.kuali.rice.kew.api.exception.WorkflowException;
019    import org.kuali.rice.kew.engine.RouteHelper;
020    import org.kuali.rice.kew.engine.node.RouteNode;
021    import org.kuali.rice.kew.engine.node.RouteNodeInstance;
022    
023    /**
024     * Factory which creates a {@link TransitionEngine} for the given {@link RouteNodeInstance}.  The 
025     * transition engine is determined based on the type of the node instance.
026     * 
027     * @see TransitionEngine
028     *
029     * @author Kuali Rice Team (rice.collab@kuali.org)
030     */
031    public class TransitionEngineFactory {
032    
033            public static TransitionEngine createTransitionEngine(RouteNodeInstance nodeInstance) throws Exception {
034                    RouteHelper helper = new RouteHelper();
035                    RouteNode routeNode = nodeInstance.getRouteNode();
036                    TransitionEngine engine = null;
037                    if (helper.isSimpleNode(routeNode)) {
038                            engine = new SimpleTransitionEngine();
039                    } else if (helper.isSplitNode(routeNode)) {
040                            engine = new SplitTransitionEngine();
041                    } else if (helper.isJoinNode(routeNode)) {
042                            engine = new JoinTransitionEngine();
043                    } else if (helper.isDynamicNode(routeNode)) {
044                            engine = new DynamicTransitionEngine();
045                    } else if (helper.isSubProcessNode(routeNode)) {
046                            engine = new SubProcessTransitionEngine();
047                    } else {
048                            throw new WorkflowException("Could not locate transition engine for node " + routeNode.getNodeType());
049                    }
050                    engine.setRouteHelper(helper);
051                    return engine;
052            }
053            
054    }