util/Environment.java

   1
   2 package org.de.metux.util;
   3
   4 import java.io.BufferedReader;
   5 import java.io.IOException;
   6 import java.util.Properties;
   7 import java.io.InputStreamReader;
   8
   9 /*
  10    grabbed this code somewhere on the web
  11
  12    we need it since stupid folks @ sun tend to remove essential functions
  13    from java-spec and other stupid folks on various vm projects had
  14    to follow them.
  15
  16    this class is a really ugly hack!
  17    imagine: we have to spawn another process just for retrieving
  18    the env of this process.
  19    against the wall w/ the dude who decided to remove System.getenv()
  20 */
  21
  22 public class Environment extends Properties
  23 {
  24     public Environment()
  25     {
  26         super();
  27         String cmd;
  28         String os = System.getProperty("os.name").toLowerCase();
  29
  30         if (os.indexOf("windows")!=-1)
  31             cmd = ((os.indexOf("95")!=-1 ||
  32                    (os.indexOf("98")!=-1) ||
  33                    (os.indexOf("ME")!=-1)) ? "command.com":"cmd")+" /Cset";
  34         else
  35             cmd = "env";
  36
  37         try
  38         {
  39             Process p = Runtime.getRuntime().exec(cmd);
  40             load(p.getInputStream());
  41             BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
  42             for (String line=""; (line=br.readLine())!=null;)
  43             {
  44                 int pos = line.indexOf("=");
  45                 setProperty(line.substring(0,pos),line.substring(pos+1));
  46             }
  47             br.close();
  48         }
  49         catch (IOException e)
  50         {
  51             setProperty("__EXCEPTION", e.toString());
  52         }
  53     }
  54
  55     static Environment env;
  56
  57     public static String getenv(String name)
  58     {
  59         if (env==null)
  60             env = new Environment();
  61         return env.getProperty(name);
  62     }
  63
  64     public static String getenv(String name, String def)
  65     {
  66         String s = getenv(name);
  67         if (s == null)
  68             return def;
  69         return s;
  70     }
  71
  72     public static boolean getenv_bool(String name, boolean def)
  73     {
  74         String val = getenv(name,null);
  75         if (val==null)
  76             return def;
  77         val = val.toLowerCase();
  78
  79         if (val.equals("on")||val.equals("yes")||val.equals("true")||val.equals("1"))
  80             return true;
  81         if (val.equals("off")||val.equals("no")||val.equals("false")||val.equals("0"))
  82             return false;
  83
  84         throw new RuntimeException("getenv_bool(): could not decode \""+val+"\"");
  85     }
  86 }