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/* Copyright (C) 2000  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the

Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for

details.  */

package gnu.gcj.io;

import java.util.*;

import java.io.*;

public class MimeTypes

{

  private static Hashtable mime_types;

  public static void fillFromFile (Hashtable table, String fname)

    throws IOException

  {

    LineNumberReader reader =

      new LineNumberReader (new FileReader (fname));

    while (reader.ready ())

      {

        StringTokenizer tokenizer =

          new StringTokenizer (reader.readLine ());

        try

          {

            String t = tokenizer.nextToken ();

            if (! t.startsWith ("#"))

              {

                while (true)

                  {

                    // Read the next extension

                    String e = tokenizer.nextToken ();

                    if ((e != null) && (! e.startsWith ("#")))

                      table.put (e, t);

                    else

                      break;

                  }

              }

          } catch (NoSuchElementException ex) {

            // Do nothing.

          }

      }

  }

  // This is the primary interface to this class.

  public static String getMimeTypeFromExtension (String extension)

  {

    if (mime_types == null)

      {

        mime_types = new Hashtable ();

        // First populate the hash table with the default mime type

        // mappings.

        int i = DefaultMimeTypes.types.length;

        while (i > 1)

          {

            mime_types.put (DefaultMimeTypes.types[i - 2],

                            DefaultMimeTypes.types[i - 1]);

            i = i - 2;

          }

        // Now read mime types from /etc/mime.types if it exists.

        // This should override the default values.

        try {

          fillFromFile (mime_types, "/etc/mime.types");

        } catch (IOException ex) {

          // Do nothing.

        }

        // Now read mime types from ~/.mime.types.  

        // FIXME: We can't currently parse this file.

      }

    String type = (String) mime_types.get (extension);

    if (type == null)

      return ("application/octet-stream");

    else

      return (type);

  }

}