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Common Lisp implementation running on the JVM
There is a newer version: 1.9.2
/*
 * JavaException.java
 *
 * Copyright (C) 2005 Peter Graves
 * $Id$
 *
 * 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.PrintWriter;
import java.io.StringWriter;

public class JavaException extends LispError
{
    private final Throwable throwable;

    public JavaException(Throwable throwable)
    {
        super(StandardClass.JAVA_EXCEPTION);
        Debug.assertTrue(slots.length == 3);
        Debug.assertTrue(throwable != null);
        this.throwable = throwable;
        setInstanceSlotValue(Symbol.CAUSE, new JavaObject(throwable));
        setFormatControl("Java exception: ~A.");
        setFormatArguments(new Cons(new JavaObject(throwable)));
    }

    @Override
    public LispObject typeOf()
    {
        return Symbol.JAVA_EXCEPTION;
    }

    @Override
    public LispObject classOf()
    {
        return StandardClass.JAVA_EXCEPTION;
    }

    @Override
    public LispObject typep(LispObject type)
    {
        if (type == Symbol.JAVA_EXCEPTION)
            return T;
        if (type == StandardClass.JAVA_EXCEPTION)
            return T;
        return super.typep(type);
    }

    @Override
    public String getMessage()
    {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        throwable.printStackTrace(pw);
        String s = sw.toString();
        final String separator = System.getProperty("line.separator");
        if (s.endsWith(separator))
            s = s.substring(0, s.length() - separator.length());
        return s;
    }

    // ### java-exception-cause java-exception => cause
    protected static final Primitive JAVA_EXCEPTION_CAUSE =
        new Primitive(Symbol.JAVA_EXCEPTION_CAUSE, "java-exception",
"Returns the cause of JAVA-EXCEPTION. (The cause is the Java Throwable\n" +
"  object that caused JAVA-EXCEPTION to be signalled.)")
    {
        @Override
        public LispObject execute(LispObject arg)
        {
            return Symbol.STD_SLOT_VALUE.execute(arg, Symbol.CAUSE);
        }
    };
}