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1   /*
2    * Copyright 2000-2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.jetspeed.services.search;
18  
19  // Turbine APIs
20  import java.util.Collections;
21  import java.util.HashMap;
22  import java.util.Map;
23  
24  import org.apache.turbine.services.resources.ResourceService;
25  import org.apache.turbine.services.TurbineServices;
26  
27  /***
28   * Search object handler factory
29   *
30   * @author <a href="morciuch@apache.org">Mark Orciuch</a>
31   * 
32   * @version $Id: HandlerFactory.java,v 1.4 2004/02/23 03:48:47 jford Exp $
33   */
34  public class HandlerFactory
35  {
36      private static final Map handlerCache = Collections.synchronizedMap(new HashMap());
37      
38      /***
39       * Returns parsed object handler for specific object
40       * 
41       * @param obj
42       * @return 
43       */
44      public static ObjectHandler getHandler(Object obj) throws Exception
45      {
46          return getHandler(obj.getClass().getName());
47  
48      }
49      
50      /***
51      * Returns parsed object handler for specific object
52      * 
53      * @param obj
54      * @return 
55      */
56      public static ObjectHandler getHandler(String className) throws Exception
57      {
58          ObjectHandler handler = null;
59          
60          if(handlerCache.containsKey(className))
61          {
62              handler = (ObjectHandler)handlerCache.get(className);
63          }
64          else
65          {
66              ResourceService serviceConf = ((TurbineServices) TurbineServices.getInstance())
67                                                .getResources(SearchService.SERVICE_NAME);
68              String handlerClass = serviceConf.getString("document." + className);
69      
70              if (handlerClass == null)
71              {
72                  throw new Exception("No handler was found for document type: " + className);
73              }
74      
75              handler = (ObjectHandler) Class.forName(handlerClass).newInstance();
76              handlerCache.put(className, handler);
77          }
78          //System.out.println("HandlerFactory: returning handler " + handler + " for " + obj);
79  
80          return handler;
81      }
82  }