| /* JarURLConnection.java -- Class for manipulating remote jar files |
| Copyright (C) 1998, 2002, 2003 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 java.net; |
| |
| import java.io.IOException; |
| import java.security.cert.Certificate; |
| import java.util.jar.Attributes; |
| import java.util.jar.JarEntry; |
| import java.util.jar.JarFile; |
| import java.util.jar.JarInputStream; |
| import java.util.jar.Manifest; |
| import java.util.zip.ZipEntry; |
| |
| |
| /** |
| * This abstract class represents a common superclass for implementations |
| * of jar URL's. A jar URL is a special type of URL that allows JAR |
| * files on remote systems to be accessed. It has the form: |
| * <p> |
| * jar:<standard URL pointing to jar filei>!/file/within/jarfile |
| * <p> for example: |
| * <p> |
| * jar:http://www.urbanophile.com/java/foo.jar!/com/urbanophile/bar.class |
| * <p> |
| * That example URL points to the file /com/urbanophile/bar.class in the |
| * remote JAR file http://www.urbanophile.com/java/foo.jar. The HTTP |
| * protocol is used only as an example. Any supported remote protocol |
| * can be used. |
| * <p> |
| * This class currently works by retrieving the entire jar file into a |
| * local cache file, then performing standard jar operations on it. |
| * (At least this is true for the default protocol implementation). |
| * |
| * @author Aaron M. Renn (arenn@urbanophile.com) |
| * @author Kresten Krab Thorup (krab@gnu.org) |
| * @date Aug 10, 1999. |
| * |
| * @since 1.2 |
| */ |
| public abstract class JarURLConnection extends URLConnection |
| { |
| /** |
| * This is the actual URL that points the remote jar file. This is parsed |
| * out of the jar URL by the constructor. |
| */ |
| private final URL jarFileURL; |
| |
| /** |
| * The connection to the jar file itself. A JarURLConnection |
| * can represent an entry in a jar file or an entire jar file. In |
| * either case this describes just the jar file itself. |
| */ |
| protected URLConnection jarFileURLConnection; |
| |
| /** |
| * This is the jar file "entry name" or portion after the "!/" in the |
| * URL which represents the pathname inside the actual jar file. |
| */ |
| private final String entryName; |
| |
| /** |
| * Creates a JarURLConnection from an URL object |
| * |
| * @param url The URL object for this connection. |
| * |
| * @exception MalformedURLException If url is invalid |
| * |
| * @specnote This constructor is protected since JDK 1.4 |
| */ |
| protected JarURLConnection(URL url) throws MalformedURLException |
| { |
| super(url); |
| |
| if (! url.getProtocol().equals("jar")) |
| throw new MalformedURLException(url + ": Not jar protocol."); |
| |
| String spec = url.getFile(); |
| int bang = spec.indexOf("!/"); |
| if (bang == -1) |
| throw new MalformedURLException(url + ": No `!/' in spec."); |
| |
| // Extract the url for the jar itself. |
| jarFileURL = new URL(spec.substring(0, bang)); |
| |
| // Get the name of the entry, if any. |
| entryName = spec.length() == (bang + 2) ? null : spec.substring(bang + 2); |
| } |
| |
| /** |
| * This method returns the "real" URL where the JarFile is located. |
| * //****Is this right?***** |
| * |
| * @return The remote URL |
| */ |
| public URL getJarFileURL() |
| { |
| return jarFileURL; |
| } |
| |
| /** |
| * Returns the "entry name" portion of the jar URL. This is the portion |
| * after the "!/" in the jar URL that represents the pathname inside the |
| * actual jar file. |
| * |
| * @return The entry name. |
| */ |
| public String getEntryName() |
| { |
| return entryName; |
| } |
| |
| /** |
| * Returns the entry in this jar file specified by the URL. |
| * |
| * @return The jar entry |
| * |
| * @exception IOException If an error occurs |
| */ |
| public JarEntry getJarEntry() throws IOException |
| { |
| JarFile jarfile = null; |
| |
| if (entryName == null) |
| return null; |
| |
| if (! doInput) |
| throw new ProtocolException("Can't open JarEntry if doInput is false"); |
| |
| try |
| { |
| jarfile = getJarFile (); |
| } |
| catch (IOException x) |
| { |
| /* ignore */ |
| } |
| |
| if (jarfile == null) |
| { |
| JarInputStream zis = new JarInputStream( |
| jarFileURLConnection.getInputStream ()); |
| |
| // This is hideous, we're doing a linear search for the thing... |
| for (ZipEntry ent = zis.getNextEntry (); |
| ent != null; |
| ent = zis.getNextEntry ()) |
| { |
| if (entryName.equals (ent.getName())) |
| { |
| return new JarEntry (ent); |
| } |
| } |
| } |
| |
| else |
| { |
| return jarfile.getJarEntry (entryName); |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Returns a read-only JarFile object for the remote jar file |
| * |
| * @return The JarFile object |
| * |
| * @exception IOException If an error occurs |
| */ |
| public abstract JarFile getJarFile() throws IOException; |
| |
| /** |
| * Returns an array of Certificate objects for the jar file entry specified |
| * by this URL or null if there are none |
| * |
| * @return A Certificate array |
| * |
| * @exception IOException If an error occurs |
| */ |
| public Certificate[] getCertificates() throws IOException |
| { |
| JarEntry entry = getJarEntry(); |
| |
| return entry != null ? entry.getCertificates() : null; |
| } |
| |
| /** |
| * Returns the main Attributes for the jar file specified in the URL or |
| * null if there are none |
| * |
| * @return The main Attributes for the JAR file for this connection |
| * |
| * @exception IOException If an error occurs |
| */ |
| public Attributes getMainAttributes() throws IOException |
| { |
| Manifest manifest = getManifest(); |
| |
| return manifest != null ? manifest.getMainAttributes() : null; |
| } |
| |
| /** |
| * Returns the Attributes for the Jar entry specified by the URL or null |
| * if none |
| * |
| * @return The Attributes object for this connection if the URL for it points |
| * to a JAR file entry, null otherwise |
| * |
| * @exception IOException If an error occurs |
| */ |
| public Attributes getAttributes() throws IOException |
| { |
| JarEntry entry = getJarEntry(); |
| |
| return entry != null ? entry.getAttributes() : null; |
| } |
| |
| /** |
| * Returns a Manifest object for this jar file, or null if there is no |
| * manifest. |
| * |
| * @return The Manifest for this connection, or null if none |
| * |
| * @exception IOException If an error occurs |
| */ |
| public Manifest getManifest() throws IOException |
| { |
| JarFile file = getJarFile(); |
| |
| return file != null ? file.getManifest() : null; |
| } |
| } |