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1   /*
2      Copyright 2007 Ivo Limmen
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  package org.limmen.crs.storage.api;
17  
18  import java.util.HashMap;
19  import java.util.Iterator;
20  import java.util.Map;
21  import java.util.ServiceLoader;
22  
23  import org.limmen.crs.storage.api.exception.UnknownStorageTypeException;
24  
25  
26  public class ConfigurationStorageFactory {
27  
28     private static ConfigurationStorageFactory current = new ConfigurationStorageFactory();
29  
30     public static ConfigurationStorageFactory getInstance() {
31  
32     	return current;
33     }
34  
35     private final Map<String, ConfigurationStorage> configurationStorageMap = new HashMap<String, ConfigurationStorage>();
36  
37     private ConfigurationStorageFactory() {
38  
39     	super();
40  
41  		ServiceLoader<ConfigurationStorage> services =
42  			ServiceLoader.load(ConfigurationStorage.class);
43  
44  		Iterator<ConfigurationStorage> servicesIterator = services.iterator();
45  
46  		while (servicesIterator.hasNext()) {
47  
48  			ConfigurationStorage storage = servicesIterator.next();
49  
50  			configurationStorageMap.put(storage.getStorageType(), storage);
51  		}
52     }
53  
54     public ConfigurationStorage getStorage(String aType) throws UnknownStorageTypeException {
55  
56     	if (!configurationStorageMap.containsKey(aType)) {
57  
58     		throw new UnknownStorageTypeException();
59     	}
60  
61     	return configurationStorageMap.get(aType);
62     }
63  }