/*
* Copyright (C) 2012 Dr. John Lindsay <jlindsay@uoguelph.ca>
*
* 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 <http://www.gnu.org/licenses/>.
*/
package whiteboxgis;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
/**
*
* @author Dr. John Lindsay email: jlindsay@uoguelph.ca
*/
public class ClasspathUtils {
// Parameters
private static final Class[] parameters = new Class[]
{
URL.class
};
/**
* Adds the jars in the given directory to classpath
* @param directory
* @throws IOException
*/
public static void addDirToClasspath(File directory) throws IOException
{
if (directory.exists())
{
File[] files = directory.listFiles();
for (int i = 0; i < files.length; i++)
{
File file = files[i];
addURL(file.toURI().toURL());
}
}
else
{
System.err.println("The directory \"" + directory + "\" does not exist!");
}
}
/**
* Add URL to CLASSPATH
* @param u URL
* @throws IOException IOException
*/
public static void addURL(URL u) throws IOException
{
URLClassLoader sysLoader = (URLClassLoader) ClassLoader.getSystemClassLoader();
URL urls[] = sysLoader.getURLs();
for (int i = 0; i < urls.length; i++)
{
if (urls[i].toString().equalsIgnoreCase(u.toString()))
{
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");
}
}
}