Package org.armedbear.lisp

Source Code of org.armedbear.lisp.JavaClassLoader

/*
* JavaClassLoader.java
*
* Copyright (C) 2003 Peter Graves
* $Id: JavaClassLoader.java,v 1.6 2003/11/15 11:03:31 beedlem Exp $
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

package org.armedbear.lisp;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;

public class JavaClassLoader extends ClassLoader
{
    protected Class loadClassFromFile(String filename)
    {
        try {
            File file = new File(filename);
            if (file.isFile()) {
                long length = file.length();
                if (length < Integer.MAX_VALUE) {
                    byte[] classbytes = new byte[(int)length];
                    DataInputStream in =
                        new DataInputStream(new FileInputStream(file));
                    in.readFully(classbytes);
                    in.close();
                    Class c = defineClass(null, classbytes, 0, (int) length);
                    if (c != null) {
                        resolveClass(c);
                        return c;
                    }
                }
            } else
                Debug.trace("file not found: " + filename);
        }
        catch (Throwable t) {
            Debug.trace(t);
        }
        return null;
    }
}
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