old-autovect-branch/libjava/gnu/java/net/protocol/gcjlib/Connection.java

   1 // Connection.java - Implementation of URLConnection for gcjlib
   2 // protocol.
   3
   4 /* Copyright (C) 2003  Free Software Foundation
   5
   6    This file is part of libgcj.
   7
   8 This software is copyrighted work licensed under the terms of the
   9 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
  10 details.  */
  11
  12 package gnu.java.net.protocol.gcjlib;
  13
  14 import java.io.InputStream;
  15 import java.io.IOException;
  16 import java.net.MalformedURLException;
  17 import java.net.URL;
  18 import java.net.URLConnection;
  19 import gnu.gcj.Core;
  20 import gnu.gcj.runtime.SharedLibHelper;
  21 import gnu.java.net.protocol.core.CoreInputStream;
  22
  23 /**
  24  * @author Tom Tromey <tromey@redhat.com>
  25  * @date January 10, 2003
  26  */
  27 class Connection extends URLConnection
  28 {
  29   String solib;
  30   String name;
  31   Core core;
  32
  33   public Connection (URL url) throws MalformedURLException
  34   {
  35     super (url);
  36     int index = url.getFile().indexOf ("!/");
  37
  38     if (index == -1)
  39       throw new MalformedURLException ("couldn't find !/ in gcjlib URL");
  40
  41     name = url.getFile().substring (index + 2);
  42     solib = url.getFile().substring (0, index);
  43   }
  44
  45   public void connect() throws IOException
  46   {
  47     if (core != null)
  48       return;
  49     // We can't create a new SharedLibHelper here, since we don't know
  50     // what parent class loader to use.
  51     SharedLibHelper helper = SharedLibHelper.findHelper(solib);
  52     if (helper == null)
  53       throw new IOException("library not loaded: " + solib);
  54     core = helper.findCore(name);
  55     if (core == null)
  56       throw new IOException("couldn't find core object: " + name);
  57   }
  58
  59   public InputStream getInputStream() throws IOException
  60   {
  61     connect();
  62     return new CoreInputStream(core);
  63   }
  64
  65   public String getHeaderField(String field)
  66   {
  67     try
  68       {
  69         if (!connected)
  70           connect();
  71
  72         if (field.equals("content-type"))
  73           return guessContentTypeFromName(name);
  74         else if (field.equals("content-length"))
  75           return Long.toString(core.length);
  76       }
  77     catch (IOException e)
  78       {
  79         // Fall through.
  80       }
  81     return null;
  82   }
  83 }