/*
* @(#)JarURLConnection.java 1.33 05/01/04
*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.net;
import java.io.IOException;
import java.util.jar.JarFile;
import java.util.jar.JarEntry;
import java.util.jar.Attributes;
import java.util.jar.Manifest;
import java.security.Permission;
import sun.net.www.ParseUtil;
/**
* A URL Connection to a Java ARchive (JAR) file or an entry in a JAR
* file.
*
* <p>The syntax of a JAR URL is:
*
* <pre>
* jar:<url>!/{entry}
* </pre>
*
* <p>for example:
*
* <p><code>
* jar:http://www.foo.com/bar/baz.jar!/COM/foo/Quux.class<br>
* </code>
*
* <p>Jar URLs should be used to refer to a JAR file or entries in
* a JAR file. The example above is a JAR URL which refers to a JAR
* entry. If the entry name is omitted, the URL refers to the whole
* JAR file:
*
* <code>
* jar:http://www.foo.com/bar/baz.jar!/
* </code>
*
* <p>Users should cast the generic URLConnection to a
* JarURLConnection when they know that the URL they created is a JAR
* URL, and they need JAR-specific functionality. For example:
*
* <pre>
* URL url = new URL("jar:file:/home/duke/duke.jar!/");
* JarURLConnection jarConnection = (JarURLConnection)url.openConnection();
* Manifest manifest = jarConnection.getManifest();
* </pre>
*
* <p>JarURLConnection instances can only be used to read from JAR files.
* It is not possible to get a {@link java.io.OutputStream} to modify or write
* to the underlying JAR file using this class.
* <p>Examples:
*
* <dl>
*
* <dt>A Jar entry
* <dd><code>jar:http://www.foo.com/bar/baz.jar!/COM/foo/Quux.class</code>
*
* <dt>A Jar file
* <dd><code>jar:http://www.foo.com/bar/baz.jar!/</code>
*
* <dt>A Jar directory
* <dd><code>jar:http://www.foo.com/bar/baz.jar!/COM/foo/</code>
*
* </dl>
*
* <p><code>!/</code> is refered to as the <em>separator</em>.
*
* <p>When constructing a JAR url via <code>new URL(context, spec)</code>,
* the following rules apply:
*
* <ul>
*
* <li>if there is no context URL and the specification passed to the
* URL constructor doesn't contain a separator, the URL is considered
* to refer to a JarFile.
*
* <li>if there is a context URL, the context URL is assumed to refer
* to a JAR file or a Jar directory.
*
* <li>if the specification begins with a '/', the Jar directory is
* ignored, and the spec is considered to be at the root of the Jar
* file.
*
* <p>Examples:
*
* <dl>
*
* <dt>context: <b>jar:http://www.foo.com/bar/jar.jar!/</b>,
* spec:<b>baz/entry.txt</b>
*
* <dd>url:<b>jar:http://www.foo.com/bar/jar.jar!/baz/entry.txt</b>
*
* <dt>context: <b>jar:http://www.foo.com/bar/jar.jar!/baz</b>,
* spec:<b>entry.txt</b>
*
* <dd>url:<b>jar:http://www.foo.com/bar/jar.jar!/baz/entry.txt</b>
*
* <dt>context: <b>jar:http://www.foo.com/bar/jar.jar!/baz</b>,
* spec:<b>/entry.txt</b>
*
* <dd>url:<b>jar:http://www.foo.com/bar/jar.jar!/entry.txt</b>
*
* </dl>
*
* </ul>
*
* @see java.net.URL
* @see java.net.URLConnection
*
* @see java.util.jar.JarFile
* @see java.util.jar.JarInputStream
* @see java.util.jar.Manifest
* @see java.util.zip.ZipEntry
*
* @author Benjamin Renaud
* @since 1.2
*/
public abstract class JarURLConnection extends URLConnection {
private URL jarFileURL;
private String entryName;
/**
* The connection to the JAR file URL, if the connection has been
* initiated. This should be set by connect.
*/
protected URLConnection jarFileURLConnection;
/**
* Creates the new JarURLConnection to the specified URL.
* @param url the URL
* @throws MalformedURLException if no legal protocol
* could be found in a specification string or the
* string could not be parsed.
*/
protected JarURLConnection(URL url) throws MalformedURLException {
super(url);
parseSpecs(url);
}
/* get the specs for a given url out of the cache, and compute and
* cache them if they're not there.
*/
private void parseSpecs(URL url) throws MalformedURLException {
String spec = url.getFile();
int separator = spec.indexOf('!');
/*
* REMIND: we don't handle nested JAR URLs
*/
if (separator == -1) {
throw new MalformedURLException("no ! found in url spec:" + spec);
}
jarFileURL = new URL(spec.substring(0, separator++));
entryName = null;
/* if ! is the last letter of the innerURL, entryName is null */
if (++separator != spec.length()) {
entryName = spec.substring(separator, spec.length());
entryName = ParseUtil.decode (entryName);
}
}
/**
* Returns the URL for the Jar file for this connection.
*
* @return the URL for the Jar file for this connection.
*/
public URL getJarFileURL() {
return jarFileURL;
}
/**
* Return the entry name for this connection. This method
* returns null if the JAR file URL corresponding to this
* connection points to a JAR file and not a JAR file entry.
*
* @return the entry name for this connection, if any.
*/
public String getEntryName() {
return entryName;
}
/**
* Return the JAR file for this connection.
*
* @return the JAR file for this connection. If the connection is
* a connection to an entry of a JAR file, the JAR file object is
* returned
*
* @exception IOException if an IOException occurs while trying to
* connect to the JAR file for this connection.
*
* @see #connect
*/
public abstract JarFile getJarFile() throws IOException;
/**
* Returns the Manifest for this connection, or null if none.
*
* @return the manifest object corresponding to the JAR file object
* for this connection.
*
* @exception IOException if getting the JAR file for this
* connection causes an IOException to be trown.
*
* @see #getJarFile
*/
public Manifest getManifest() throws IOException {
return getJarFile().getManifest();
}
/**
* Return the JAR entry object for this connection, if any. This
* method returns null if the JAR file URL corresponding to this
* connection points to a JAR file and not a JAR file entry.
*
* @return the JAR entry object for this connection, or null if
* the JAR URL for this connection points to a JAR file.
*
* @exception IOException if getting the JAR file for this
* connection causes an IOException to be trown.
*
* @see #getJarFile
* @see #getJarEntry
*/
public JarEntry getJarEntry() throws IOException {
return getJarFile().getJarEntry(entryName);
}
/**
* Return the Attributes object for this connection if the URL
* for it points to a JAR file entry, null otherwise.
*
* @return the Attributes object for this connection if the URL
* for it points to a JAR file entry, null otherwise.
*
* @exception IOException if getting the JAR entry causes an
* IOException to be thrown.
*
* @see #getJarEntry
*/
public Attributes getAttributes() throws IOException {
JarEntry e = getJarEntry();
return e != null ? e.getAttributes() : null;
}
/**
* Returns the main Attributes for the JAR file for this
* connection.
*
* @return the main Attributes for the JAR file for this
* connection.
*
* @exception IOException if getting the manifest causes an
* IOException to be thrown.
*
* @see #getJarFile
* @see #getManifest
*/
public Attributes getMainAttributes() throws IOException {
Manifest man = getManifest();
return man != null ? man.getMainAttributes() : null;
}
/**
* Return the Certificate object for this connection if the URL
* for it points to a JAR file entry, null otherwise. This method
* can only be called once
* the connection has been completely verified by reading
* from the input stream until the end of the stream has been
* reached. Otherwise, this method will return <code>null</code>
*
* @return the Certificate object for this connection if the URL
* for it points to a JAR file entry, null otherwise.
*
* @exception IOException if getting the JAR entry causes an
* IOException to be thrown.
*
* @see #getJarEntry
*/
public java.security.cert.Certificate[] getCertificates()
throws IOException
{
JarEntry e = getJarEntry();
return e != null ? e.getCertificates() : null;
}
}
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