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1   package org.codehaus.plexus.interpolation.os;
2   
3   /*
4    * The MIT License
5    *
6    * Copyright (c) 2004, The Codehaus
7    *
8    * Permission is hereby granted, free of charge, to any person obtaining a copy of
9    * this software and associated documentation files (the "Software"), to deal in
10   * the Software without restriction, including without limitation the rights to
11   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
12   * of the Software, and to permit persons to whom the Software is furnished to do
13   * so, subject to the following conditions:
14   *
15   * The above copyright notice and this permission notice shall be included in all
16   * copies or substantial portions of the Software.
17   *
18   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24   * SOFTWARE.
25   */
26  
27  import java.io.IOException;
28  import java.util.Locale;
29  import java.util.Map;
30  import java.util.Properties;
31  
32  /**
33   * <b>NOTE:</b> This class was copied from plexus-utils, to allow this library
34   * to stand completely self-contained.
35   * <br/>
36   * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l </a>
37   * @version $Id$
38   */
39  public final class OperatingSystemUtils
40  {
41  
42      private OperatingSystemUtils()
43      {
44      }
45  
46      public static Properties getSystemEnvVars()
47          throws IOException
48      {
49          return getSystemEnvVars( true );
50      }
51  
52      /**
53       * Return the shell environment variables. If <code>caseSensitive == true</code>, then envar
54       * keys will all be upper-case.
55       *
56       * @param caseSensitive Whether environment variable keys should be treated case-sensitively.
57       * @return Properties object of (possibly modified) envar keys mapped to their values.
58       * @throws IOException
59       */
60  
61      public static Properties getSystemEnvVars( boolean caseSensitive )
62          throws IOException
63      {
64          Properties envVars = new Properties();
65          Map<String, String> envs = System.getenv();
66          for ( String key : envs.keySet() )
67          {
68              String value = envs.get( key );
69              if ( !caseSensitive)
70              {
71                  key = key.toUpperCase( Locale.ENGLISH );
72              }
73              envVars.put( key, value );
74          }
75          return envVars;
76      }
77  }