package net.sf.saxon.tinytree;
import net.sf.saxon.om.AxisIteratorImpl;
import net.sf.saxon.om.Item;
import net.sf.saxon.om.SequenceIterator;
import net.sf.saxon.pattern.NodeTest;
/**
* This class supports the preceding-sibling axis.
* The starting node must be an element, text node, comment, or processing instruction:
* to ensure this, construct the enumeration using NodeInfo#getEnumeration()
*/
final class PrecedingSiblingEnumeration extends AxisIteratorImpl {
private TinyTree document;
private TinyNodeImpl startNode;
private int nextNodeNr;
private NodeTest test;
private TinyNodeImpl parentNode;
PrecedingSiblingEnumeration(TinyTree doc, TinyNodeImpl node, NodeTest nodeTest) {
document = doc;
document.ensurePriorIndex();
test = nodeTest;
startNode = node;
nextNodeNr = node.nodeNr;
parentNode = node.parent; // doesn't matter if this is null (unknown)
}
public Item next() {
// if (nextNodeNr < 0) {
// return null;
// }
while (true) {
nextNodeNr = document.prior[nextNodeNr];
if (nextNodeNr < 0) {
current = null;
position = -1;
return null;
}
if (test.matches(document, nextNodeNr)) {
position++;
current = document.getNode(nextNodeNr);
((TinyNodeImpl)current).setParentNode(parentNode);
return current;
};
}
}
/**
* Get another enumeration of the same nodes
*/
public SequenceIterator getAnother() {
return new PrecedingSiblingEnumeration(document, startNode, test);
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
// you may not use this file except in compliance with the License. You may obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): none.
//
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