libjava/gnu/gcj/io/MimeTypes.java

   1 /* Copyright (C) 2000  Free Software Foundation
   2
   3    This file is part of libgcj.
   4
   5 This software is copyrighted work licensed under the terms of the
   6 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   7 details.  */
   8
   9 package gnu.gcj.io;
  10
  11 import java.util.*;
  12 import java.io.*;
  13
  14 public class MimeTypes
  15 {
  16   private static Hashtable mime_types;
  17
  18   public static void fillFromFile (Hashtable table, String fname)
  19     throws IOException
  20   {
  21     LineNumberReader reader =
  22       new LineNumberReader (new FileReader (fname));
  23
  24     while (reader.ready ())
  25       {
  26         StringTokenizer tokenizer =
  27           new StringTokenizer (reader.readLine ());
  28
  29         try
  30           {
  31             String t = tokenizer.nextToken ();
  32
  33             if (! t.startsWith ("#"))
  34               {
  35                 while (true)
  36                   {
  37                     // Read the next extension
  38                     String e = tokenizer.nextToken ();
  39                     if ((e != null) && (! e.startsWith ("#")))
  40                       table.put (e, t);
  41                     else
  42                       break;
  43                   }
  44               }
  45           } catch (NoSuchElementException ex) {
  46             // Do nothing.
  47           }
  48       }
  49   }
  50
  51   // This is the primary interface to this class.
  52   public static String getMimeTypeFromExtension (String extension)
  53   {
  54     if (mime_types == null)
  55       {
  56         mime_types = new Hashtable ();
  57
  58         // First populate the hash table with the default mime type
  59         // mappings.
  60         int i = DefaultMimeTypes.types.length;
  61         while (i > 1)
  62           {
  63             mime_types.put (DefaultMimeTypes.types[i - 2],
  64                             DefaultMimeTypes.types[i - 1]);
  65             i = i - 2;
  66           }
  67
  68         // Now read mime types from /etc/mime.types if it exists.
  69         // This should override the default values.
  70         try {
  71           fillFromFile (mime_types, "/etc/mime.types");
  72         } catch (IOException ex) {
  73           // Do nothing.
  74         }
  75
  76         // Now read mime types from ~/.mime.types.
  77         // FIXME: We can't currently parse this file.
  78       }
  79
  80     String type = (String) mime_types.get (extension);
  81     if (type == null)
  82       return ("application/octet-stream");
  83     else
  84       return (type);
  85   }
  86 }