| /* Connection - jar url connection for java.net |
| Copyright (C) 1999, 2002, 2003, 2005, 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.net.protocol.jar; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.JarURLConnection; |
| import java.net.MalformedURLException; |
| import java.net.ProtocolException; |
| import java.net.URL; |
| import java.net.URLConnection; |
| import java.text.SimpleDateFormat; |
| import java.util.Date; |
| import java.util.Hashtable; |
| import java.util.Locale; |
| import java.util.jar.JarEntry; |
| import java.util.jar.JarFile; |
| import java.util.zip.ZipFile; |
| |
| /** |
| * This subclass of java.net.JarURLConnection models a URLConnection via |
| * the "jar" protocol. |
| * |
| * @author Kresten Krab Thorup (krab@gnu.org) |
| */ |
| public final class Connection extends JarURLConnection |
| { |
| /** |
| * HTTP-style DateFormat, used to format the last-modified header. |
| * Lazy initialized since jar files are used during bootstrapping. |
| */ |
| private static SimpleDateFormat dateFormat; |
| |
| private JarFile jar_file; |
| private JarEntry jar_entry; |
| private URL jar_url; |
| |
| public static class JarFileCache |
| { |
| private static Hashtable cache = new Hashtable(); |
| private static final int READBUFSIZE = 4*1024; |
| |
| public static synchronized JarFile get (URL url, boolean useCaches) |
| throws IOException |
| { |
| JarFile jf; |
| if (useCaches) |
| { |
| jf = (JarFile) cache.get (url); |
| if (jf != null) |
| return jf; |
| } |
| |
| if ("file".equals (url.getProtocol())) |
| { |
| String fn = url.getFile(); |
| fn = gnu.java.net.protocol.file.Connection.unquote(fn); |
| File f = new File (fn); |
| jf = new JarFile (f, true, ZipFile.OPEN_READ); |
| } |
| else |
| { |
| URLConnection urlconn = url.openConnection(); |
| InputStream is = urlconn.getInputStream(); |
| byte[] buf = new byte [READBUFSIZE]; |
| File f = File.createTempFile ("cache", "jar"); |
| FileOutputStream fos = new FileOutputStream (f); |
| int len = 0; |
| |
| while ((len = is.read (buf)) != -1) |
| { |
| fos.write (buf, 0, len); |
| } |
| |
| fos.close(); |
| // Always verify the Manifest, open read only and delete when done. |
| jf = new JarFile (f, true, |
| ZipFile.OPEN_READ | ZipFile.OPEN_DELETE); |
| } |
| |
| if (useCaches) |
| cache.put (url, jf); |
| |
| return jf; |
| } |
| } |
| |
| protected Connection(URL url) |
| throws MalformedURLException |
| { |
| super(url); |
| } |
| |
| public synchronized void connect() throws IOException |
| { |
| // Call is ignored if already connected. |
| if (connected) |
| return; |
| |
| jar_url = getJarFileURL(); |
| jar_file = JarFileCache.get (jar_url, useCaches); |
| String entry_name = getEntryName(); |
| |
| if (entry_name != null |
| && !entry_name.equals ("")) |
| { |
| jar_entry = (JarEntry) jar_file.getEntry (entry_name); |
| |
| if(jar_entry == null) |
| throw new FileNotFoundException("No entry for " + entry_name + " exists."); |
| } |
| |
| connected = true; |
| } |
| |
| public InputStream getInputStream() throws IOException |
| { |
| if (!connected) |
| connect(); |
| |
| if (! doInput) |
| throw new ProtocolException("Can't open InputStream if doInput is false"); |
| |
| return jar_file.getInputStream (jar_entry); |
| } |
| |
| public synchronized JarFile getJarFile() throws IOException |
| { |
| if (!connected) |
| connect(); |
| |
| if (! doInput) |
| throw new ProtocolException("Can't open JarFile if doInput is false"); |
| |
| return jar_file; |
| } |
| |
| public String getHeaderField(String field) |
| { |
| try |
| { |
| if (!connected) |
| connect(); |
| |
| if (field.equals("content-type")) |
| return guessContentTypeFromName(getJarEntry().getName()); |
| else if (field.equals("content-length")) |
| return Long.toString(getJarEntry().getSize()); |
| else if (field.equals("last-modified")) |
| { |
| // Both creating and manipulating dateFormat need synchronization. |
| synchronized (Connection.class) |
| { |
| if (dateFormat == null) |
| dateFormat = new SimpleDateFormat |
| ("EEE, dd MMM yyyy hh:mm:ss 'GMT'", |
| new Locale ("En", "Us", "Unix")); |
| |
| return dateFormat.format(new Date(getJarEntry().getTime())); |
| } |
| } |
| } |
| catch (IOException e) |
| { |
| // Fall through. |
| } |
| return null; |
| } |
| |
| public int getContentLength() |
| { |
| if (!connected) |
| return -1; |
| |
| return (int) jar_entry.getSize(); |
| } |
| |
| public long getLastModified() |
| { |
| if (!connected) |
| return -1; |
| |
| try |
| { |
| return getJarEntry().getTime(); |
| } |
| catch (IOException e) |
| { |
| return -1; |
| } |
| } |
| } |