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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 WMIN extends Instruction
29  {
30  
31      /**
32       * instance
33       */
34      public static final Instruction instance = new WMIN();
35  
36      private static final long serialVersionUID = 4483330169540260074L;
37  
38      private WMIN(){};
39  
40      /**
41       * RMAX instruction microcode
42       * @param context ExecutionContext
43       * @throws ZExecutionException
44       */
45      public void execute(final ExecutionContext context) throws ZExecutionException
46      {
47          final MatchIterator iterator = new MatchIterator((String) context.popSyncStackVal());
48          context.stack.pop();
49          FindMin stuff = new FindMin();
50          iterator.iterate(stuff, context.memContext);
51          context.stack.push(stuff.getMin());
52          context.ip++;
53      }
54  
55      private static final class FindMin implements MatchIterator.DoStuff
56      {
57  
58          private transient double min = Double.POSITIVE_INFINITY;
59  
60          public OperableDouble getMin()
61          {
62              return new OperableDouble(min);
63          }
64  
65          public void execute(Object obj, List context)
66          {
67              if (obj instanceof OperableNumber)
68              {
69                  final double val = ((OperableNumber) obj).doubleValue();
70                  if (val < min)
71                  {
72                      min = val;
73                  }
74              }
75          }
76      }
77  }