/*
 * WrongNumberOfArgumentsException.java
 *
 * Copyright (C) 2002-2005 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.*;

public final class WrongNumberOfArgumentsException extends ProgramError
{
    private Operator operator;
    private int expectedArgs;
    private String message;

    public WrongNumberOfArgumentsException(Operator operator) {
	this(operator, -1);
    }

    public WrongNumberOfArgumentsException(Operator operator, int expectedArgs) {
        // This is really just an ordinary PROGRAM-ERROR, broken out into its
        // own Java class as a convenience for the implementation.
        super(StandardClass.PROGRAM_ERROR);
        this.operator = operator;
	this.expectedArgs = expectedArgs;
        setFormatControl(getMessage());
        setFormatArguments(NIL);
    }

    public WrongNumberOfArgumentsException(String message) {
        super(StandardClass.PROGRAM_ERROR);
	if(message == null) {
	    throw new NullPointerException("message can not be null");
	}
	this.message = message;
        setFormatControl(getMessage());
        setFormatArguments(NIL);
    }

    @Override
    public String getMessage()
    {
	if(message != null) {
	    return message;
	}
        StringBuilder sb =
            new StringBuilder("Wrong number of arguments");
        LispObject lambdaName = operator.getLambdaName();
        if (lambdaName != null && lambdaName != NIL) {
            sb.append(" for ");
            sb.append(operator.getLambdaName().writeToString());
        }
	if(expectedArgs >= 0) {
	    sb.append("; ");
	    sb.append(expectedArgs);
	    sb.append(" expected");
	}
        sb.append('.');
        return message = sb.toString();
    }
}