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The Waikato Environment for Knowledge Analysis (WEKA), a machine
learning workbench. This is the stable version. Apart from bugfixes, this version
does not receive any other updates.
/*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see .
*/
/*
* ClassloaderUtil.java
* Copyright (C) 2008-2012 University of Waikato, Hamilton, New Zealand
*
*/
package weka.core;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
/**
* Utility class that can add jar files to the classpath dynamically.
*
* @author Mark Hall (mhall{[at]}pentaho{[dot]}org
* @version $Revision: 10203 $
*/
public class ClassloaderUtil implements RevisionHandler {
// Parameters
private static final Class[] parameters = new Class[] { URL.class };
/**
* Add file to CLASSPATH
*
* @param s File name
* @throws IOException if something goes wrong when adding a file
*/
public static void addFile(String s) throws IOException {
File f = new File(s);
addFile(f);
}
/**
* Add file to CLASSPATH
*
* @param f File object
* @throws IOException if something goes wrong when adding a file
*/
public static void addFile(File f) throws IOException {
addURL(f.toURI().toURL());
}
/**
* Add URL to CLASSPATH
*
* @param u URL
* @throws IOException if something goes wrong when adding a url
*/
public static void addURL(URL u) throws IOException {
ClassloaderUtil clu = new ClassloaderUtil();
// URLClassLoader sysLoader = (URLClassLoader)
// ClassLoader.getSystemClassLoader();
URLClassLoader sysLoader = (URLClassLoader) clu.getClass().getClassLoader();
URL urls[] = sysLoader.getURLs();
for (URL url : urls) {
if (url.toString().toLowerCase().equals(u.toString().toLowerCase())) {
System.err.println("URL " + u + " is already in the CLASSPATH");
return;
}
}
Class sysclass = URLClassLoader.class;
try {
Method method = sysclass.getDeclaredMethod("addURL", parameters);
method.setAccessible(true);
method.invoke(sysLoader, new Object[] { u });
} catch (Throwable t) {
t.printStackTrace();
throw new IOException("Error, could not add URL to system classloader");
}
}
/**
* Returns the revision string.
*
* @return the revision
*/
@Override
public String getRevision() {
return RevisionUtils.extract("$Revision: 10203 $");
}
}