01: /*
02: * UnboundSlot.java
03: *
04: * Copyright (C) 2003-2004 Peter Graves
05: * $Id: UnboundSlot.java,v 1.3 2004/05/25 15:53:50 piso 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: public final class UnboundSlot extends CellError {
25: private LispObject instance = NIL;
26:
27: public UnboundSlot(LispObject initArgs) throws ConditionThrowable {
28: super (initArgs);
29: LispObject first, second;
30: while (initArgs != NIL) {
31: first = initArgs.car();
32: initArgs = initArgs.cdr();
33: second = initArgs.car();
34: if (first == Keyword.INSTANCE) {
35: instance = second;
36: break;
37: }
38: initArgs = initArgs.cdr();
39: }
40: }
41:
42: public LispObject getInstance() {
43: return instance;
44: }
45:
46: public String getMessage() {
47: StringBuffer sb = new StringBuffer("The slot ");
48: sb.append(safeWriteToString(getCellName()));
49: sb.append(" is unbound in the object ");
50: sb.append(safeWriteToString(instance));
51: sb.append('.');
52: return sb.toString();
53: }
54:
55: public LispObject typeOf() {
56: return Symbol.UNBOUND_SLOT;
57: }
58:
59: public LispClass classOf() {
60: return BuiltInClass.UNBOUND_SLOT;
61: }
62:
63: public LispObject typep(LispObject type) throws ConditionThrowable {
64: if (type == Symbol.UNBOUND_SLOT)
65: return T;
66: if (type == BuiltInClass.UNBOUND_SLOT)
67: return T;
68: return super.typep(type);
69: }
70: }
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