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Java > Open Source Codes > org > armedbear > lisp > lognand


1 /*
2  * lognand.java
3  *
4  * Copyright (C) 2003-2004 Peter Graves
5  * $Id: lognand.java,v 1.6 2004/03/04 01:14:34 piso Exp $
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version 2
10  * of the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20  */
21
22 package org.armedbear.lisp;
23
24 import java.math.BigInteger JavaDoc;
25
26 public final class lognand extends Primitive2
27 {
28     private lognand()
29     {
30         super("lognand", "integer-1 integer-2");
31     }
32
33     public LispObject execute(LispObject first, LispObject second)
34         throws ConditionThrowable
35     {
36         if (first instanceof Fixnum) {
37             if (second instanceof Fixnum)
38                 return new Fixnum(~(((Fixnum)first).value &
39                                     ((Fixnum)second).value));
40             if (second instanceof Bignum) {
41                 BigInteger JavaDoc n1 = ((Fixnum)first).getBigInteger();
42                 BigInteger JavaDoc n2 = ((Bignum)second).value;
43                 return number(n1.and(n2).not());
44             }
45             return signal(new TypeError(second, Symbol.INTEGER));
46         }
47         if (first instanceof Bignum) {
48             BigInteger JavaDoc n1 = ((Bignum)first).value;
49             if (second instanceof Fixnum) {
50                 BigInteger JavaDoc n2 = ((Fixnum)second).getBigInteger();
51                 return number(n1.and(n2).not());
52             }
53             if (second instanceof Bignum) {
54                 BigInteger JavaDoc n2 = ((Bignum)second).value;
55                 return number(n1.and(n2).not());
56             }
57             return signal(new TypeError(second, Symbol.INTEGER));
58         }
59         return signal(new TypeError(first, Symbol.INTEGER));
60     }
61
62     private static final Primitive2 LOGNAND = new lognand();
63 }
64
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