EnvironmentReader


1   /*
2   
3   This software is OSI Certified Open Source Software.
4   OSI Certified is a certification mark of the Open Source Initiative.
5   
6   The license (Mozilla version 1.0) can be read at the MMBase site.
7   See http://www.MMBase.org/license
8   
9   */
10  package org.mmbase.util.externalprocess;
11  
12  import java.io.ByteArrayOutputStream  ;
13  import java.io.IOException  ;
14  import java.util.Properties  ;
15  import java.util.StringTokenizer  ;
16  import java.util.Vector  ;
17  
18  /** Reader for importing the OS Environment properties into java.
19   * java.lang.System.getProperties() has only some environment info
20   *
21   * @todo more OS support
22   *
23   * @author Nico Klasens (Finalist IT Group)
24   * @version $Id: EnvironmentReader.java,v 1.4 2003/09/01 13:29:47 pierre Exp $
25   * @since MMBase-1.6
26   */
27  public class EnvironmentReader {
28      private static Properties   envVars = null;
29      private static Vector   rawVars = null;
30  
31      /**
32       * Get value of environment properties
33       * @return Properties environment
34       */
35      public static Properties   getEnvVars() {
36  
37          if (null != envVars)
38              return envVars;
39  
40          envVars = new Properties  ();
41          rawVars = new Vector  (32);
42          String   lineSeparator = System.getProperty("line.separator");
43  
44          String   command = getEnvCommand();
45  
46          CommandLauncher launcher = new CommandLauncher("EnvironmentReader");
47          ByteArrayOutputStream   outputStream = new ByteArrayOutputStream  ();
48          try {
49              launcher.execute(command);
50              launcher.waitAndRead(outputStream, null);
51  
52              String   envStr = outputStream.toString();
53              StringTokenizer   strTokens = new StringTokenizer  (envStr, lineSeparator);
54  
55              String   line;
56              while (strTokens.hasMoreTokens()) {
57                  line = strTokens.nextToken();
58  
59                  rawVars.add(line);
60                  int idx = line.indexOf('=');
61                  if (idx != -1) {
62                      String   key = line.substring(0, idx);
63                      String   value = line.substring(idx + 1);
64                      envVars.setProperty(key, value);
65                  } else {
66                      envVars.setProperty(line, "");
67                  }
68              }
69          } catch (ProcessException e) {} finally {
70              try {
71                  if (outputStream != null) {
72                      outputStream.close();
73                  }
74              } catch (IOException   e) {}
75          }
76          rawVars.trimToSize();
77          return envVars;
78      }
79  
80      /**
81       * Command string to get OS Environment properties
82       * @return String
83       */
84      public static String   getEnvCommand() {
85          String   OS = System.getProperty("os.name").toLowerCase();
86          if (OS.indexOf("windows 9") > -1) {
87              return "command.com /c set";
88          } else {
89              if ((OS.indexOf("nt") > -1) || (OS.indexOf("windows 2000") > -1) || (OS.indexOf("windows xp") > -1)) {
90                  return "cmd.exe /c set";
91              } else {
92                  throw new UnsupportedOperationException  ("OS not supported yet");
93              }
94          }
95      }
96  
97      /**
98       * Get value of environment property
99       * @param key property name
100      * @return String value of environment property
101      */
102     public static String   getEnvVar(String   key) {
103         Properties   p = getEnvVars();
104         return p.getProperty(key);
105     }
106 
107     /**
108      * getRawEnvVars returns an array of lines read from the shell.
109      * @return String[] lines of the shell
110      */
111     public static String  [] getRawEnvVars() {
112         getEnvVars();
113         return (String  [])rawVars.toArray(new String  [0]);
114     }
115 }
116
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