libjava/gnu/gcj/protocol/jar/Connection.java

   1 /* Copyright (C) 1999, 2002  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.protocol.jar;
  10
  11 import java.net.URL;
  12 import java.net.URLConnection;
  13 import java.net.JarURLConnection;
  14 import java.net.URLStreamHandler;
  15 import java.net.MalformedURLException;
  16 import java.net.ProtocolException;
  17 import java.io.IOException;
  18 import java.io.InputStream;
  19 import java.io.File;
  20 import java.io.FileOutputStream;
  21 import java.util.jar.JarFile;
  22 import java.util.zip.ZipFile;
  23 import java.util.Hashtable;
  24
  25 /**
  26  * Written using on-line Java Platform 1.2 API Specification.
  27  *
  28  * @author Kresten Krab Thorup <krab@gnu.org>
  29  * @date Aug 10, 1999.
  30  */
  31
  32
  33
  34 public class Connection extends JarURLConnection
  35 {
  36   static Hashtable file_cache = new Hashtable();
  37   private JarFile jarfile;
  38
  39   public Connection(URL url)
  40     throws MalformedURLException
  41   {
  42     super(url);
  43   }
  44
  45   public synchronized JarFile getJarFile() throws java.io.IOException
  46   {
  47     if (!connected)
  48       connect();
  49
  50     if (! doInput)
  51       throw new ProtocolException("Can't open JarFile if doInput is false");
  52
  53     if (jarfile != null)
  54       return jarfile;
  55
  56     URL jarFileURL = getJarFileURL ();
  57
  58     if (jarFileURL.getProtocol ().equals ("file")
  59         && jarFileURL.getHost ().equals (""))
  60       {
  61         if (getUseCaches())
  62           {
  63             jarfile = (JarFile) file_cache.get(jarFileURL);
  64             if (jarfile == null)
  65               {
  66                 jarfile = new JarFile (jarFileURL.getFile ());
  67                 file_cache.put (jarFileURL, jarfile);
  68               }
  69           }
  70         else
  71           jarfile = new JarFile (jarFileURL.getFile ());
  72       }
  73     else
  74       {
  75         URLConnection urlconn = jarFileURL.openConnection();
  76         InputStream is = urlconn.getInputStream();
  77         byte[] buf = new byte[4*1024];
  78         File f = File.createTempFile("cache", "jar");
  79         FileOutputStream fos = new FileOutputStream(f);
  80         int len = 0;
  81         while((len = is.read(buf)) != -1)
  82           fos.write(buf, 0, len);
  83         fos.close();
  84         // Always verify the Manifest, open read only and delete when done.
  85         // XXX ZipFile.OPEN_DELETE not yet implemented.
  86         // jf = new JarFile(f, true, ZipFile.OPEN_READ | ZipFile.OPEN_DELETE);
  87         jarfile = new JarFile(f, true, ZipFile.OPEN_READ);
  88       }
  89
  90     return jarfile;
  91   }
  92
  93 }