| /* Connection - jar url connection for java.net |
| Copyright (C) 1999, 2002, 2003, 2005 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., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 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.BufferedInputStream; |
| import java.io.ByteArrayInputStream; |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.InputStream; |
| import java.io.IOException; |
| 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.HashMap; |
| import java.util.Hashtable; |
| import java.util.Locale; |
| import java.util.jar.JarEntry; |
| import java.util.jar.JarFile; |
| import java.util.jar.JarInputStream; |
| import java.util.zip.ZipEntry; |
| 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 |
| { |
| private static Hashtable file_cache = new Hashtable(); |
| |
| /** |
| * HTTP-style DateFormat, used to format the last-modified header. |
| */ |
| private static SimpleDateFormat dateFormat |
| = new SimpleDateFormat("EEE, dd MMM yyyy hh:mm:ss 'GMT'", |
| new Locale ("En", "Us", "Unix")); |
| |
| private JarFile jar_file; |
| |
| /** |
| * Cached JarURLConnection objects. |
| */ |
| static HashMap connectionCache = new HashMap(); |
| |
| protected Connection(URL url) |
| throws MalformedURLException |
| { |
| super(url); |
| } |
| |
| public synchronized void connect() throws IOException |
| { |
| // Call is ignored if already connected. |
| if (connected) |
| return; |
| |
| if (getUseCaches()) |
| { |
| jarFileURLConnection = |
| (URLConnection) connectionCache.get(getJarFileURL()); |
| |
| if (jarFileURLConnection == null) |
| { |
| jarFileURLConnection = getJarFileURL().openConnection(); |
| jarFileURLConnection.setUseCaches(true); |
| jarFileURLConnection.connect(); |
| connectionCache.put(getJarFileURL(), jarFileURLConnection); |
| } |
| } |
| else |
| { |
| jarFileURLConnection = getJarFileURL().openConnection(); |
| jarFileURLConnection.connect(); |
| } |
| |
| connected = true; |
| } |
| |
| public InputStream getInputStream() throws IOException |
| { |
| if (!connected) |
| connect(); |
| |
| if (! doInput) |
| throw new ProtocolException("Can't open InputStream if doInput is false"); |
| |
| if (getEntryName() == null) |
| { |
| // This is a JarURLConnection for the entire jar file. |
| |
| InputStream in = new BufferedInputStream |
| (jarFileURLConnection.getInputStream()); |
| return new JarInputStream(in); |
| } |
| |
| // Reaching this point, we're looking for an entry of a jar file. |
| |
| JarFile jarfile = null; |
| |
| try |
| { |
| jarfile = getJarFile (); |
| } |
| catch (IOException x) |
| { |
| /* ignore */ |
| } |
| |
| if (jarfile != null) |
| { |
| // this is the easy way... |
| ZipEntry entry = jarfile.getEntry(getEntryName()); |
| |
| if (entry != null) |
| return jarfile.getInputStream (entry); |
| } |
| else |
| { |
| // If the jar file is not local, ... |
| JarInputStream zis = new JarInputStream( |
| jarFileURLConnection.getInputStream ()); |
| |
| // This is hideous, we're doing a linear search... |
| for (ZipEntry entry = zis.getNextEntry(); |
| entry != null; |
| entry = zis.getNextEntry()) |
| { |
| if (getEntryName().equals(entry.getName())) |
| { |
| int size = (int) entry.getSize(); |
| byte[] data = new byte[size]; |
| zis.read (data, 0, size); |
| return new ByteArrayInputStream (data); |
| } |
| } |
| } |
| |
| throw new FileNotFoundException("No entry for \"" + getEntryName() |
| + "\" in \"" |
| + getJarFileURL() |
| + "\""); |
| } |
| |
| public synchronized JarFile getJarFile() throws IOException |
| { |
| if (!connected) |
| connect(); |
| |
| if (! doInput) |
| throw new ProtocolException("Can't open JarFile if doInput is false"); |
| |
| if (jar_file != null) |
| return jar_file; |
| |
| URL jarFileURL = getJarFileURL(); |
| |
| if (jarFileURL.getProtocol().equals ("file") |
| && jarFileURL.getHost().equals ("")) |
| { |
| if (getUseCaches()) |
| { |
| jar_file = (JarFile) file_cache.get (jarFileURL); |
| if (jar_file == null) |
| { |
| jar_file = new JarFile (jarFileURL.getFile()); |
| file_cache.put (jarFileURL, jar_file); |
| } |
| } |
| else |
| jar_file = new JarFile (jarFileURL.getFile()); |
| } |
| else |
| { |
| URLConnection urlconn = jarFileURL.openConnection(); |
| InputStream is = urlconn.getInputStream(); |
| byte[] buf = new byte[4*1024]; |
| 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. |
| jar_file = new JarFile (f, true, |
| ZipFile.OPEN_READ | ZipFile.OPEN_DELETE); |
| } |
| |
| 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")) |
| { |
| synchronized (dateFormat) |
| { |
| return dateFormat.format(new Date(getJarEntry().getTime())); |
| } |
| } |
| } |
| catch (IOException e) |
| { |
| // Fall through. |
| } |
| return null; |
| } |
| |
| public int getContentLength() |
| { |
| if (!connected) |
| return -1; |
| |
| try |
| { |
| return (int) getJarEntry().getSize(); |
| } |
| catch (IOException e) |
| { |
| return -1; |
| } |
| } |
| |
| public long getLastModified() |
| { |
| if (!connected) |
| return -1; |
| |
| try |
| { |
| return getJarEntry().getTime(); |
| } |
| catch (IOException e) |
| { |
| return -1; |
| } |
| } |
| } |