/*
 * DynamicLibraryLoader.java
 *
 * Copyright (C) 2002-2009 Takis Diakoumis
 *
 * 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 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 org.underworldlabs.util;

import java.net.URL;
import java.net.URLClassLoader;

/**
 *
 * @author   Takis Diakoumis
 * @version  $Revision: 1460 $
 * @date     $Date: 2009-01-25 11:06:46 +1100 (Sun, 25 Jan 2009) $
 */
public class DynamicLibraryLoader extends URLClassLoader {
    
    private ClassLoader parent = null;

    public DynamicLibraryLoader(URL[] urls) {
        super(urls, ClassLoader.getSystemClassLoader());
        parent = ClassLoader.getSystemClassLoader();
    }
    
    public Class loadLibrary(String clazz)
      throws ClassNotFoundException {
        return loadClass(clazz, true);
    }
    
    public Class loadLibrary(String clazz, boolean resolve)
      throws ClassNotFoundException {
        return loadClass(clazz, resolve);
    }
    
    protected synchronized Class loadClass(String classname, boolean resolve)
      throws ClassNotFoundException {

        Class theClass = findLoadedClass(classname);

        if (theClass != null) {
            return theClass;
        }
        
        try {
            theClass = findBaseClass(classname);
        } 
        catch (ClassNotFoundException cnfe) {
            theClass = findClass(classname);
        } 
        
        if (resolve) {
            resolveClass(theClass);
        }

        return theClass;
        
    }
    
    private Class findBaseClass(String name) throws ClassNotFoundException {

        if (parent == null) {
            return findSystemClass(name);
        } else {
            return parent.loadClass(name);
        }
        
    }
    
}






