1 /***
2 * @(#)DAOFactoryImpl.java
3 *
4 * JFoxSOAF, Service-Oriented Application Framework
5 *
6 * Copyright(c) JFoxSOAF Team
7 *
8 * Licensed under the GNU LGPL, Version 2.1 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
11 *
12 * http://www.gnu.org/copyleft/lesser.html
13 *
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 *
20 * For more information, please visit:
21 * http://www.jfox.cn/confluence/display/JFoxSOAF/Home
22 * http://www.huihoo.org/jfox/jfoxsoaf
23 */
24
25 package org.huihoo.jfox.soaf.services.dao;
26
27 import java.util.Collections;
28 import java.util.HashMap;
29 import java.util.Map;
30
31 import org.huihoo.jfox.soaf.exception.DAOException;
32
33 /***
34 * <p>
35 * Alternatvie DAO Factory implementation with reflection.
36 * </p>
37 *
38 * @author <a href="mailto:founder_chen@yahoo.com.cn">Peter Cheng </a>
39 * @version $Revision: 1.1 $ $Date: 2005/04/27 08:02:53 $
40 * @version Revision: 1.0
41 */
42
43 public class DAOFactoryImpl implements DAOFactory {
44
45 private Map daoCache = Collections.synchronizedMap(new HashMap());
46
47 /***
48 * This method instantiates the DAO class.
49 *
50 * @param clazz
51 * @throws DAOException
52 */
53 public DAO getDAO(Class clazz) throws DAOException {
54
55 try {
56 if (daoCache.containsKey(clazz.getName())) {
57 return (DAO) daoCache.get(clazz.getName());
58 } else {
59 Object obj = Class.forName(clazz.getName()).newInstance();
60 daoCache.put(clazz.getName(), obj);
61 return (DAO) obj;
62 }
63 } catch (InstantiationException e) {
64 throw new DAOException("DAOFactoryImpl.getDAO(" + clazz.getName()
65 + "): NamingException while getting DAO type : \n"
66 + e.getMessage());
67 } catch (IllegalAccessException e) {
68 throw new DAOException("DAOFactoryImpl.getDAO(" + clazz.getName()
69 + "): NamingException while getting DAO type : \n"
70 + e.getMessage());
71 } catch (ClassNotFoundException e) {
72 throw new DAOException("DAOFactoryImpl.getDAO(" + clazz.getName()
73 + "): NamingException while getting DAO type : \n"
74 + e.getMessage());
75 }
76 }
77
78 }