OSEnvironmentReaderFromRuntimeExec


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2    * Version: CPL 1.0/GPL 2.0/LGPL 2.1
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4    * The contents of this file are subject to the Common Public
5    * License Version 1.0 (the "License"); you may not use this file
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10   * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
11   * implied. See the License for the specific language governing
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13   *
14   * Copyright (C) 2006 Tim Azzopardi <tim@tigerfive.com>
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17   * either of the GNU General Public License Version 2 or later (the "GPL"),
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28  
29  package org.jruby.environment;
30  
31  import java.io.BufferedReader  ;
32  import java.io.IOException  ;
33  import java.io.InputStreamReader  ;
34  import java.util.Map  ;
35  
36  import org.jruby.Ruby;
37  
38  class OSEnvironmentReaderFromRuntimeExec implements IOSEnvironmentReader {
39  
40      private final OSEnvironment environmentReader = new OSEnvironment();
41  
42      /* (non-Javadoc)
43       * @see org.jruby.IOSEnvironment#isAccessible()
44       */
45      public boolean isAccessible(Ruby runtime) {
46          return true;
47      }
48      
49      
50      private String   getEnvCommand() {
51          String   command;
52          String   osname = System.getProperty("os.name").toLowerCase();
53  
54          // TODO merge this logic into RubyKernel.runInShell? / possible conflict if jruby.shell System property is set
55  
56          if (osname.indexOf("windows 9") > -1) {
57              command = "command.com /c set";
58          } else if ((osname.indexOf("nt") > -1)
59                  || (osname.indexOf("windows 20") > -1)
60                  || (osname.indexOf("windows xp") > -1)) {
61              command = "cmd.exe /c set";
62          } else {
63              // Assume some unix variant with an env command
64              command = "env";
65          }
66          return command;
67      }
68      
69      
70      /*
71       * (non-Javadoc)
72       * 
73       * @see org.jruby.IOSEnvironment#getVariables()
74       */
75      public Map   getVariables(Ruby runtime) {
76          try {
77              Process   process = Runtime.getRuntime().exec(getEnvCommand());
78              return environmentReader.getVariablesFrom(
79                      new BufferedReader  (new InputStreamReader  (process.getInputStream()))
80                      );
81          } catch (IOException   e) {
82              environmentReader.handleException(e);
83          }
84          
85          return null;
86      }
87  
88  }
89
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