View Javadoc

1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  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  package org.apache.commons.configuration;
19  
20  import java.util.Iterator;
21  
22  /***
23   * A configuration based on the system properties.
24   *
25   * @author Emmanuel Bourg
26   * @version $Revision: 727834 $, $Date: 2008-12-18 23:16:32 +0100 (Do, 18 Dez 2008) $
27   * @since 1.1
28   */
29  public class SystemConfiguration extends MapConfiguration
30  {
31      /***
32       * Create a Configuration based on the system properties.
33       *
34       * @see System#getProperties
35       */
36      public SystemConfiguration()
37      {
38          super(System.getProperties());
39      }
40  
41      /***
42       * The method allows system properties to be set from a property file.
43       * @param fileName The name of the property file.
44       * @throws Exception if an error occurs.
45       */
46      public static void setSystemProperties(String fileName) throws Exception
47      {
48          PropertiesConfiguration config = fileName.endsWith(".xml")
49              ? new XMLPropertiesConfiguration(fileName) : new PropertiesConfiguration(fileName);
50          setSystemProperties(config);
51      }
52  
53      /***
54       * Set System properties from a configuration file.
55       * @param systemConfig The configuration containing the properties to be set.
56       */
57      public static void setSystemProperties(PropertiesConfiguration systemConfig)
58      {
59          Iterator iter = systemConfig.getKeys();
60          while (iter.hasNext())
61          {
62              String key = (String) iter.next();
63              String value = (String) systemConfig.getProperty(key);
64              System.setProperty(key, value);
65          }
66      }
67  }