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Java > Open Source Codes > gnu > kawa > xml > PrecedingAxis


1 // Copyright (c) 2003 Per M.A. Bothner.
2 // This is free software; for terms and warranty disclaimer see ./COPYING.
3
4 package gnu.kawa.xml;
5 import gnu.lists.*;
6
7 /** Used to implement a following:: step in a path expression. */
8
9 public class PrecedingAxis extends TreeScanner
10 {
11   public static PrecedingAxis make (NodePredicate type)
12   {
13     PrecedingAxis axis = new PrecedingAxis();
14     axis.type = type;
15     return axis;
16   }
17
18   private static void scan (AbstractSequence seq, int ipos, int end,
19                 NodePredicate type, PositionConsumer out)
20   {
21     int parent = seq.parentPos(ipos);
22     if (parent == end)
23       return;
24     scan (seq, parent, end, type, out);
25     int child = seq.firstChildPos(parent);
26     if (child == 0)
27       return;
28     if (type.isInstancePos(seq, child))
29       out.writePosition(seq, child);
30     for (;;)
31       {
32     child = seq.nextMatching(child, type, ipos, true);
33     if (child == 0)
34       break;
35     out.writePosition(seq, child);
36       }
37   }
38
39   public void scan (AbstractSequence seq, int ipos, PositionConsumer out)
40   {
41     scan(seq, ipos, seq.endPos(), type, out);
42   }
43 }
44
45
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