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


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-sibling:: step in a path expression. */
8
9 public class PrecedingSiblingAxis extends TreeScanner
10 {
11   public static PrecedingSiblingAxis make (NodePredicate type)
12   {
13     PrecedingSiblingAxis axis = new PrecedingSiblingAxis();
14     axis.type = type;
15     return axis;
16   }
17
18   public void scan (AbstractSequence seq, int ipos, PositionConsumer out)
19   {
20     int end = seq.endPos();
21     int parent = seq.parentPos(ipos);
22     if (parent == end)
23       return;
24     int child = seq.firstChildPos(parent);
25     if (child == 0)
26       return;
27     if (type.isInstancePos(seq, child))
28       out.writePosition(seq, child);
29     for (;;)
30       {
31     child = seq.nextMatching(child, type, ipos, false);
32     if (child == 0)
33       break;
34     out.writePosition(seq, child);
35       }
36   }
37 }
38
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