01: /*
02: * lognand.java
03: *
04: * Copyright (C) 2003 Peter Graves
05: * $Id: lognand.java,v 1.6 2003/11/15 11:03:28 beedlem Exp $
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License
09: * 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;
25:
26: public final class lognand extends Primitive2 {
27: private lognand(String name) {
28: super (name);
29: }
30:
31: public LispObject execute(LispObject first, LispObject second)
32: throws ConditionThrowable {
33: if (first instanceof Fixnum) {
34: if (second instanceof Fixnum)
35: return new Fixnum(
36: ~(((Fixnum) first).getValue() & ((Fixnum) second)
37: .getValue()));
38: if (second instanceof Bignum) {
39: BigInteger n1 = ((Fixnum) first).getBigInteger();
40: BigInteger n2 = ((Bignum) second).getValue();
41: return number(n1.and(n2).not());
42: }
43: throw new ConditionThrowable(new TypeError(second,
44: "integer"));
45: }
46: if (first instanceof Bignum) {
47: BigInteger n1 = ((Bignum) first).getValue();
48: if (second instanceof Fixnum) {
49: BigInteger n2 = ((Fixnum) second).getBigInteger();
50: return number(n1.and(n2).not());
51: }
52: if (second instanceof Bignum) {
53: BigInteger n2 = ((Bignum) second).getValue();
54: return number(n1.and(n2).not());
55: }
56: throw new ConditionThrowable(new TypeError(second,
57: "integer"));
58: }
59: throw new ConditionThrowable(new TypeError(first, "integer"));
60: }
61:
62: private static final lognand LOGNAND = new lognand("lognand");
63: }
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