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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/net/protocol/jar/Connection.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/net/protocol/jar/Connection.java | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/net/protocol/jar/Connection.java b/gcc-4.4.3/libjava/classpath/gnu/java/net/protocol/jar/Connection.java new file mode 100644 index 000000000..386aacef6 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/net/protocol/jar/Connection.java @@ -0,0 +1,232 @@ +/* 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<URL, JarFile> cache + = new Hashtable<URL, JarFile>(); + private static final int READBUFSIZE = 4*1024; + + public static synchronized JarFile get (URL url, boolean useCaches) + throws IOException + { + JarFile jf; + if (useCaches) + { + jf = 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; + } + } +} |