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 package net.sf.zel.instr;
19
20 import net.sf.zel.vm.*;
21
22 /**
23 *
24 * @author zoly
25 */
26 public final class NEQ extends Instruction
27 {
28 private static final long serialVersionUID = -2608208783491820358L;
29
30 private NEQ(){};
31
32 public void execute(ExecutionContext context) throws ZExecutionException
33 {
34 Comparable a = (Comparable) context.popSyncStackVal();
35 Comparable b = (Comparable) context.popSyncStackVal();
36 if (a != null)
37 context.stack.push(Boolean.valueOf(a.compareTo(b) != 0));
38 else if (b != null )
39 context.stack.push(Boolean.TRUE);
40 else
41 context.stack.push(Boolean.FALSE);
42 context.ip++;
43 }
44 /**
45 * instance
46 */
47 public static final Instruction instance = new NEQ();
48 }