/*
* This file is modified by Ivan Maidanski <ivmai@ivmaisoft.com>
* Project name: JCGO (http://www.ivmaisoft.com/jcgo/)
* Class root location: $(JCGO)/goclsp/clsp_fix
* Origin: GNU Classpath v0.93
*/
/* JarURLLoader.java -- Jar subclass of URLLoader
Copyright (C) 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.loader;
import gnu.java.net.IndexListParser;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLStreamHandlerFactory;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
/**
* A <code>JarURLLoader</code> is a type of <code>URLLoader</code>
* only loading from jar url.
*/
public final class JarURLLoader extends URLLoader
{
// True if we've initialized -- i.e., tried open the jar file.
private boolean initialized;
// The jar file for this url.
JarFile jarfile;
// Base jar: url for all resources loaded from jar.
final URL baseJarURL;
// The "Class-Path" attribute of this Jar's manifest.
private ArrayList classPath;
// If not null, a mapping from INDEX.LIST for this jar only.
// This is a set of all prefixes and top-level files that
// ought to be available in this jar.
private Set indexSet;
private static final String jarStr =
protocolNameOf("gnu.java.net.protocol.jar.Handler");
private static String protocolNameOf(String className)
{
int end = className.lastIndexOf('.');
return className.substring(className.lastIndexOf('.', end - 1) + 1, end);
}
// This constructor is used internally. It purposely does not open
// the jar file -- it defers this until later. This allows us to
// implement INDEX.LIST lazy-loading semantics.
private JarURLLoader(URLClassLoader classloader, URLStreamHandlerCache cache,
URLStreamHandlerFactory factory,
URL baseURL, URL absoluteUrl,
Set indexSet)
{
super(classloader, cache, factory, baseURL, absoluteUrl);
URL newBaseURL = null;
try
{
// Cache url prefix for all resources in this jar url.
String base = baseURL.toExternalForm() + "!/";
newBaseURL = new URL(jarStr, "", -1, base, cache.get(factory, jarStr));
}
catch (MalformedURLException ignore)
{
// Ignore.
}
this.baseJarURL = newBaseURL;
this.classPath = null;
this.indexSet = indexSet;
}
// This constructor is used by URLClassLoader. It will immediately
// try to read the jar file, in case we've found an index or a class-path
// setting. FIXME: it would be nice to defer this as well, but URLClassLoader
// makes this hard.
public JarURLLoader(URLClassLoader classloader, URLStreamHandlerCache cache,
URLStreamHandlerFactory factory,
URL baseURL, URL absoluteUrl)
{
this(classloader, cache, factory, baseURL, absoluteUrl, null);
initialize();
}
private void initialize()
{
JarFile jarfile = null;
try
{
jarfile =
((JarURLConnection) baseJarURL.openConnection()).getJarFile();
Manifest manifest;
Attributes attributes;
String classPathString;
IndexListParser parser = new IndexListParser(jarfile, baseJarURL,
baseURL);
LinkedHashMap indexMap = parser.getHeaders();
if (indexMap != null)
{
// Note that the index also computes
// the resulting Class-Path -- there are jars out there
// where the index lists some required jars which do
// not appear in the Class-Path attribute in the manifest.
this.classPath = new ArrayList();
Iterator it = indexMap.entrySet().iterator();
while (it.hasNext())
{
Map.Entry entry = (Map.Entry) it.next();
URL subURL = (URL) entry.getKey();
Set prefixes = (Set) entry.getValue();
if (subURL.equals(baseURL))
this.indexSet = prefixes;
else
{
JarURLLoader subLoader = new JarURLLoader(classloader,
cache,
factory, subURL,
subURL,
prefixes);
// Note that we don't care if the sub-loader itself has an
// index or a class-path -- only the top-level jar
// file gets this treatment; its index should cover
// everything.
this.classPath.add(subLoader);
}
}
}
else if ((manifest = jarfile.getManifest()) != null
&& (attributes = manifest.getMainAttributes()) != null
&& ((classPathString
= attributes.getValue(Attributes.Name.CLASS_PATH))
!= null))
{
this.classPath = new ArrayList();
StringTokenizer st = new StringTokenizer(classPathString, " ");
while (st.hasMoreElements ())
{
String e = st.nextToken ();
try
{
URL subURL = new URL(baseURL, e);
// We've seen at least one jar file whose Class-Path
// attribute includes the original jar. If we process
// that normally we end up with infinite recursion.
if (subURL.equals(baseURL))
continue;
JarURLLoader subLoader = new JarURLLoader(classloader,
cache, factory,
subURL, subURL);
this.classPath.add(subLoader);
ArrayList extra = subLoader.getClassPath();
if (extra != null)
this.classPath.addAll(extra);
}
catch (java.net.MalformedURLException xx)
{
// Give up
}
}
}
}
catch (IOException ioe)
{
/* ignored */
}
this.jarfile = jarfile;
this.initialized = true;
}
/** get resource with the name "name" in the jar url */
public Resource getResource(String name)
{
if (name.startsWith("/"))
name = name.substring(1);
if (indexSet != null)
{
// Trust the index.
String basename = name;
int offset = basename.lastIndexOf('/');
if (offset != -1)
basename = basename.substring(0, offset);
if (! indexSet.contains(basename))
return null;
// FIXME: if the index claim to hold the resource, and jar file
// doesn't have it, we're supposed to throw an exception. However,
// in our model this is tricky to implement, as another URLLoader from
// the same top-level jar may have an overlapping index entry.
}
if (! initialized)
initialize();
if (jarfile == null)
return null;
JarEntry je = jarfile.getJarEntry(name);
if (je != null)
return new JarURLResource(this, name, je);
else
return null;
}
public Manifest getManifest()
{
try
{
return (jarfile == null) ? null : jarfile.getManifest();
}
catch (IOException ioe)
{
return null;
}
}
public ArrayList getClassPath()
{
return classPath;
}
}