URLClassLoader.java [plain text]
package java.net;
import java.io.*;
import java.util.jar.*;
import java.util.Enumeration;
import java.util.Vector;
public class URLClassLoader extends ClassLoader
{
URLStreamHandlerFactory factory = null;
private Vector path;
private Vector info;
private URLStreamHandler getHandler0 (String protocol)
{
if (factory != null)
return factory.createURLStreamHandler(protocol);
else
return null;
}
public URLClassLoader (URL[] urls)
{
this (urls, null, null);
}
public URLClassLoader (URL[] urls, ClassLoader parent)
{
this (urls, parent, null);
}
private URL jarFileize (URL url)
{
if (! url.getProtocol ().equals ("jar"))
{
String f = url.getFile ();
if (f.charAt (f.length ()-1) != '/')
{
try
{
url = new URL ("jar", "", -1, (url.toExternalForm ())+"!/",
getHandler0 ("jar"));
}
catch (MalformedURLException x)
{
}
}
}
return url;
}
protected void addURL (URL url)
{
JarURLConnection conn = null;
url = jarFileize (url);
path.addElement (url);
if (url.getProtocol ().equals ("jar"))
{
try
{
conn = (JarURLConnection) url.openConnection ();
}
catch (java.io.IOException x)
{
}
}
info.addElement (conn);
}
public URLClassLoader (URL[] urls, ClassLoader parent,
URLStreamHandlerFactory fac)
{
super (parent);
factory = fac;
if (urls == null || urls.length == 0)
{
path = new Vector (1);
info = new Vector (1);
return;
}
path = new Vector (urls.length);
info = new Vector (urls.length);
for (int i = 0; i < urls.length; i++)
{
URL u = jarFileize(urls[i]);
path.addElement (u);
if (u.getProtocol ().equals ("jar"))
{
JarURLConnection conn = null;
try
{
conn = (JarURLConnection) u.openConnection ();
}
catch (java.io.IOException x)
{
}
info.addElement (conn);
}
else
{
info.addElement (null);
}
}
}
public URL[] getURLs ()
{
URL[] urls = new URL[path.size()];
path.copyInto (urls);
return urls;
}
public Enumeration findResources (String name)
{
Vector results = new Vector ();
for (int i = 0; i < path.size(); i++)
{
URL u = (URL)path.elementAt (i);
try {
JarURLConnection conn = (JarURLConnection) info.elementAt (i);
if (conn != null)
{
if (conn.getJarFile().getJarEntry (name) != null)
results.addElement (new URL(u, name, getHandler0 (u.getProtocol())));
}
else
{
URL p = new URL (u, name, getHandler0 (u.getProtocol()));
InputStream is = p.openStream();
if (is != null)
{
is.close();
results.addElement (p);
}
}
} catch (IOException x) {
continue;
}
}
return results.elements ();
}
public URL findResource (String name)
{
for (int i = 0; i < path.size(); i++)
{
URL u = (URL)path.elementAt (i);
try {
JarURLConnection conn = (JarURLConnection) info.elementAt (i);
if (conn != null)
{
if (conn.getJarFile().getJarEntry (name) != null)
return new URL(u, name, getHandler0 (u.getProtocol()));
}
else
{
URL p = new URL (u, name, getHandler0 (u.getProtocol()));
InputStream is = p.openStream();
if (is != null)
{
is.close();
return p;
}
}
} catch (IOException x) {
continue;
}
}
return null;
}
protected Class findClass (String name)
throws ClassNotFoundException
{
if (name == null)
throw new ClassNotFoundException ("null");
try
{
URL u = getResource (name.replace ('.', '/') + ".class");
if (u == null)
throw new ClassNotFoundException (name);
URLConnection connection = u.openConnection ();
InputStream is = connection.getInputStream ();
int len = connection.getContentLength ();
byte[] data = new byte[len];
int left = len;
int off = 0;
while (left > 0)
{
int c = is.read (data, off, len-off);
if (c == -1 || c == 0)
throw new InternalError ("premature end of file");
left -= c;
off += c;
}
return defineClass (name, data, 0, len);
}
catch (java.io.IOException x)
{
throw new ClassNotFoundException(name);
}
}
}