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Java > Open Source Codes > org > apache > ojb > broker > core > PersistenceBrokerFactoryFactory


1 package org.apache.ojb.broker.core;
2
3 /* Copyright 2003-2005 The Apache Software Foundation
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 import org.apache.ojb.broker.OJBRuntimeException;
19 import org.apache.ojb.broker.util.ClassHelper;
20 import org.apache.ojb.broker.util.configuration.Configuration;
21 import org.apache.ojb.broker.util.configuration.Configurator;
22 import org.apache.ojb.broker.util.configuration.impl.OjbConfigurator;
23 import org.apache.ojb.broker.util.logging.Logger;
24 import org.apache.ojb.broker.util.logging.LoggerFactory;
25
26 /**
27  *
28  * @author Thomas Mahler
29  * @version $Id: PersistenceBrokerFactoryFactory.java,v 1.4.2.1 2005/12/21 22:25:01 tomdz Exp $
30  */
31 public class PersistenceBrokerFactoryFactory
32 {
33     private static Logger log = LoggerFactory.getBootLogger();
34
35     private static final String JavaDoc PBF_KEY = "PersistenceBrokerFactoryClass";
36     private static PersistenceBrokerFactoryIF singleton = init();
37
38     /**
39      * Returns an {@link PersistenceBrokerFactoryIF} instance.
40      */
41     public static PersistenceBrokerFactoryIF instance()
42     {
43         return singleton;
44     }
45
46     private static PersistenceBrokerFactoryIF init()
47     {
48         if (log.isDebugEnabled()) log.debug("Instantiate PersistenceBrokerFactory");
49         Class JavaDoc pbfClass = null;
50         try
51         {
52             Configurator configurator = OjbConfigurator.getInstance();
53             Configuration config = configurator.getConfigurationFor(null);
54             pbfClass = config.getClass(PBF_KEY, null);
55             if(pbfClass == null)
56             {
57                 log.error("Creation of PersistenceBrokerFactory (PBF) instance failed, can't get PBF class object");
58                 throw new OJBRuntimeException("Property for key '" + PBF_KEY + "' can not be found in properties file");
59             }
60             PersistenceBrokerFactoryIF result = (PersistenceBrokerFactoryIF) ClassHelper.newInstance(pbfClass);
61             configurator.configure(result);
62             log.info("PersistencebrokerFactory class instantiated: " + result);
63             return result;
64         }
65         catch (Exception JavaDoc e)
66         {
67             if(e instanceof OJBRuntimeException)
68             {
69                 throw (OJBRuntimeException) e;
70             }
71             else
72             {
73                 throw new OJBRuntimeException("Error while instantiation of PersistenceBrokerFactory class", e);
74             }
75         }
76     }
77 }
78
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