package org.objectweb.celtix.tools.utils;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLStreamHandler;
import java.util.StringTokenizer;
public final class URLFactory {
public static final String PROTOCOL_HANDLER_PKGS = "java.protocol.handler.pkgs";
public static final String UNKNOWN_PROPTOCL_EX_MSG = "unknown protocol: ";
private URLFactory() {
}
public static URL createURL(String spec) throws MalformedURLException {
return createURL(null, spec);
}
public static URL createURL(URL context, String spec) throws MalformedURLException {
URL url = null;
try {
url = new URL(context, spec);
} catch (MalformedURLException mue) {
String msg = mue.getMessage();
if (msg.indexOf(UNKNOWN_PROPTOCL_EX_MSG) != -1) {
URLStreamHandler handler = findHandler(msg.substring(UNKNOWN_PROPTOCL_EX_MSG.length()));
if (handler != null) {
url = new URL(context, spec, handler);
}
}
if (url == null) {
throw mue;
}
}
return url;
}
public static URLStreamHandler findHandler(String protocol) {
URLStreamHandler handler = null;
String packagePrefixList = System.getProperty(PROTOCOL_HANDLER_PKGS, "");
StringTokenizer packagePrefixIter = new StringTokenizer(packagePrefixList, "|");
while (handler == null && packagePrefixIter.hasMoreTokens()) {
String packagePrefix = packagePrefixIter.nextToken().trim();
try {
String clsName = packagePrefix + "." + protocol + ".Handler";
Class cls = null;
try {
cls = Class.forName(clsName);
} catch (ClassNotFoundException e) {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl != null) {
cls = cl.loadClass(clsName);
}
}
if (cls != null) {
handler = (URLStreamHandler)cls.newInstance();
}
} catch (Exception ignored) {
ignored.getMessage();
}
}
return handler;
}
}