/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2000 Michael Powers

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/

package net.wotonomy.ui.swing.util;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Hashtable;

/**
 * ClassGrabber is a class loader used by WindowGrabber. It simply loads classes
 * by filename and nothing more. It exists mainly because the java 1.1 class
 * loading framework doesn't easily allow the creation of class loaders nor the
 * loading of arbitrary classes.
 *
 * @author michael@mpowers.net
 * @version $Revision: 904 $ $Date: 2006-02-18 18:19:05 -0500 (Sat, 18 Feb 2006)
 *          $
 */
public class ClassGrabber extends ClassLoader {
	Hashtable classMap = new Hashtable();

	public ClassGrabber() {
		super();
	}

	protected Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
		Class c = (Class) classMap.get(name);

		if (c != null)
			return c;

		try {
			c = findSystemClass(name);
		} catch (Exception exc1) {
			// System.err.print( "findSystemClass: " + name + ": " );
			// System.err.println( exc1 );
		}

		if (c != null)
			return c;

		try {
			c = findLoadedClass(name);
		} catch (Exception exc1) {
			// System.err.print( "findLoadedClass: " + name + ": " );
			// System.err.println( exc1 );
		}

		if (c != null)
			return c;

		try {
			InputStream input = new BufferedInputStream(new FileInputStream(name));
			ByteArrayOutputStream output = new ByteArrayOutputStream(200);
			int ch;
			while ((ch = input.read()) != -1) {
				output.write(ch);
			}
			byte[] data = output.toByteArray();
			c = defineClass(null, data, 0, data.length);
		} catch (Exception exc) {
			System.err.print("getResource: " + name + ": ");
			System.err.println(exc);
			c = null;
		}

		if (c != null) {
			classMap.put(name, c);
			if (resolve)
				resolveClass(c);
		}

		return c;
	}
}

/*
 * $Log$ Revision 1.2 2006/02/18 23:19:05 cgruber Update imports and maven
 * dependencies.
 *
 * Revision 1.1 2006/02/16 13:22:22 cgruber Check in all sources in
 * eclipse-friendly maven-enabled packages.
 *
 * Revision 1.2 2003/08/06 23:07:53 chochos general code cleanup (mostly,
 * removing unused imports)
 *
 * Revision 1.1.1.1 2000/12/21 15:51:18 mpowers Contributing wotonomy.
 *
 * Revision 1.2 2000/12/20 16:25:45 michael Added log to all files.
 *
 *
 */