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Java > Open Source Codes > org > apache > ojb > broker > accesslayer > sql > SqlGeneratorFactory


1 package org.apache.ojb.broker.accesslayer.sql;
2
3 /* Copyright 2002-2005 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.util.factory.ConfigurableFactory;
19 import org.apache.ojb.broker.platforms.Platform;
20
21 import java.util.Map JavaDoc;
22 import java.util.HashMap JavaDoc;
23
24 /**
25  * This factory creates SqlGenerator instances. it is a configurable factory and
26  * can be used to generate user defined implementations too.
27  * @author Thomas Mahler
28  */
29 public class SqlGeneratorFactory extends ConfigurableFactory
30 {
31     private static SqlGeneratorFactory instance = null;
32
33     private Map JavaDoc generatorMap = new HashMap JavaDoc();
34
35     /**
36      * @see org.apache.ojb.broker.util.factory.ConfigurableFactory#getConfigurationKey()
37      */
38     protected String JavaDoc getConfigurationKey()
39     {
40         return "SqlGeneratorClass";
41     }
42
43     public SqlGenerator createSqlGenerator(Platform pf)
44     {
45         SqlGenerator gen = (SqlGenerator) generatorMap.get(pf.getClass().getName());
46         if(gen == null)
47         {
48             gen = (SqlGenerator) this.createNewInstance(Platform.class, pf);
49             generatorMap.put(pf.getClass(), gen);
50         }
51         return gen;
52     }
53
54     public static SqlGeneratorFactory getInstance()
55     {
56         if (instance == null)
57         {
58             instance = new SqlGeneratorFactory();
59         }
60         return instance;
61     }
62 }
63
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