1 /*
2 * Copyright (c) 2001, Zoltan Farkas All Rights Reserved.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 package net.sf.zel.instr;
20
21 import net.sf.zel.vm.*;
22
23 /**
24 *
25 * @author zoly
26 */
27 public final class COND extends Instruction
28 {
29 private static final long serialVersionUID = 584597000187469774L;
30
31 private COND(){};
32
33 public void execute(ExecutionContext context) throws ZExecutionException
34 {
35
36 boolean cond = (java.lang.Boolean) context.popSyncStackVal();
37 int address = ((Number) context.code.get(++context.ip)).intValue();
38 if (!cond)
39 {
40 context.ip=address;
41 } else
42 {
43 context.ip++;
44 }
45 }
46 /**
47 * instance
48 */
49 public static final Instruction instance = new COND();
50 }