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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/net/JarURLConnection.java
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+/* JarURLConnection.java -- Class for manipulating remote jar files
+ Copyright (C) 1998, 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., 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 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.Manifest;
+
+
+/**
+ * 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:&lt;standard URL pointing to jar filei&gt;!/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
+ {
+ if (entryName == null)
+ return null;
+ JarFile jarFile = getJarFile();
+ return jarFile != null ? jarFile.getJarEntry(entryName) : 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;
+ }
+}