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.var;
19
20
21 import java.util.List;
22 import net.sf.zel.instr.Instruction;
23 import net.sf.zel.nr.OperableDouble;
24 import net.sf.zel.nr.OperableNumber;
25 import net.sf.zel.vm.ExecutionContext;
26 import net.sf.zel.vm.ZExecutionException;
27
28 public final class WMAX extends Instruction
29 {
30
31 /**
32 * instance
33 */
34 public static final Instruction instance = new WMAX();
35 private static final long serialVersionUID = 633231612310298332L;
36
37 private WMAX(){};
38
39 /**
40 * RMAX instruction microcode
41 * @param context ExecutionContext
42 * @throws ZExecutionException
43 */
44 public void execute(ExecutionContext context) throws ZExecutionException
45 {
46 final MatchIterator iterator = new MatchIterator((String) context.popSyncStackVal());
47 context.stack.pop();
48 FindMax stuff = new FindMax();
49 iterator.iterate(stuff, context.memContext);
50 context.stack.push(stuff.getMax());
51 context.ip++;
52 }
53
54
55
56 private static final class FindMax implements MatchIterator.DoStuff
57 {
58
59 private transient double max = Double.NEGATIVE_INFINITY;
60
61 public OperableDouble getMax()
62 {
63 return new OperableDouble(max);
64 }
65
66 public void execute(Object obj, List context)
67 {
68 if (obj instanceof OperableNumber)
69 {
70 final double val = ((OperableNumber) obj).doubleValue();
71 if (val > max)
72 {
73 max = val;
74 }
75 }
76 }
77 }
78
79 }