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Java > Open Source Codes > com > icl > saxon > tree > PrecedingEnumeration


1 package com.icl.saxon.tree;
2 import com.icl.saxon.pattern.NodeTest;
3
4 final class PrecedingEnumeration extends TreeEnumeration {
5
6     NodeImpl nextAncestor;
7     
8     public PrecedingEnumeration(NodeImpl node, NodeTest nodeTest) {
9         super(node, nodeTest);
10
11         // we need to avoid returning ancestors of the starting node
12 nextAncestor = (NodeImpl)node.getParent();
13         advance();
14     }
15
16
17     /**
18     * Special code to skip the ancestors of the start node
19     */
20
21     protected boolean conforms(NodeImpl node) {
22         // ASSERT: we'll never test the root node, because it's always
23 // an ancestor, so nextAncestor will never be null.
24 if (node!=null) {
25             if (node.isSameNode(nextAncestor)) {
26                 nextAncestor = (NodeImpl)nextAncestor.getParent();
27                 return false;
28             }
29         }
30         return super.conforms(node);
31     }
32
33     protected void step() {
34         next = next.getPreviousInDocument();
35     }
36
37     /**
38     * Get the last position, that is the number of nodes in the enumeration
39     */
40
41     public int getLastPosition() {
42         if (last>=0) return last;
43         PrecedingEnumeration enum =
44             new PrecedingEnumeration(start, nodeTest);
45         return enum.count();
46     }
47 }
48
49
50
51
52 //
53 // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
54 // you may not use this file except in compliance with the License. You may obtain a copy of the
55 // License at http://www.mozilla.org/MPL/
56 //
57 // Software distributed under the License is distributed on an "AS IS" basis,
58 // WITHOUT WARRANTY OF ANY KIND, either express or implied.
59 // See the License for the specific language governing rights and limitations under the License.
60 //
61 // The Original Code is: all this file.
62 //
63 // The Initial Developer of the Original Code is
64 // Michael Kay of International Computers Limited (mhkay@iclway.co.uk).
65 //
66 // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
67 //
68 // Contributor(s): none.
69 //
70
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