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Common Lisp implementation running on the JVM

There is a newer version: 1.0.1

/*
 * file_write_date.java
 *
 * Copyright (C) 2003-2005 Peter Graves
 * $Id: file_write_date.java 12422 2010-02-06 10:52:32Z mevenson $
 *
 * 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.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module.  An independent module is a module which is not derived from
 * or based on this library.  If you modify this library, you may extend
 * this exception to your version of the library, but you are not
 * obligated to do so.  If you do not wish to do so, delete this
 * exception statement from your version.
 */

package org.armedbear.lisp;

import static org.armedbear.lisp.Lisp.*;

import java.io.File;

// ### file-write-date
public final class file_write_date extends Primitive
{
    private file_write_date()
    {
        super("file-write-date");
    }

    @Override
    public LispObject execute(LispObject arg)
    {
        Pathname pathname = coerceToPathname(arg);
        if (pathname.isWild())
            error(new FileError("Bad place for a wild pathname.", pathname));
        long lastModified = pathname.getLastModified();
        if (lastModified == 0)
            return NIL;
        return number(lastModified / 1000 + 2208988800L);
    }

    private static final Primitive FILE_WRITE_DATE = new file_write_date();
}