/**
* Get the number of nodes in this node list. The function is probably ill named?
*
* @param xctxt The XPath runtime context.
* @return the number of nodes in this node list.
*/
public int getLastPos(XPathContext xctxt) {
int count = 0;
AxesWalker savedWalker = wi().getLastUsedWalker();
try {
ReverseAxesWalker clone = (ReverseAxesWalker) this.clone();
clone.setRoot(this.getRoot());
clone.setPredicateCount(this.getPredicateCount() - 1);
clone.setPrevWalker(null);
clone.setNextWalker(null);
wi().setLastUsedWalker(clone);
// Count 'em all
// count = 1;
int next;
while (DTM.NULL != (next = clone.nextNode())) {
count++;
}
} catch (CloneNotSupportedException cnse) {
// can't happen
} finally {
wi().setLastUsedWalker(savedWalker);
}
return count;
}
/**
* Get the current sub-context position. In order to do the reverse axes count, for the moment
* this re-searches the axes up to the predicate. An optimization on this is to cache the nodes
* searched, but, for the moment, this case is probably rare enough that the added complexity
* isn't worth it.
*
* @param predicateIndex The predicate index of the proximity position.
* @return The pridicate index, or -1.
*/
protected int getProximityPosition(int predicateIndex) {
// A negative predicate index seems to occur with
// (preceding-sibling::*|following-sibling::*)/ancestor::*[position()]/*[position()]
// -sb
if (predicateIndex < 0) return -1;
int count = m_proximityPositions[predicateIndex];
if (count <= 0) {
AxesWalker savedWalker = wi().getLastUsedWalker();
try {
ReverseAxesWalker clone = (ReverseAxesWalker) this.clone();
clone.setRoot(this.getRoot());
clone.setPredicateCount(predicateIndex);
clone.setPrevWalker(null);
clone.setNextWalker(null);
wi().setLastUsedWalker(clone);
// Count 'em all
count++;
int next;
while (DTM.NULL != (next = clone.nextNode())) {
count++;
}
m_proximityPositions[predicateIndex] = count;
} catch (CloneNotSupportedException cnse) {
// can't happen
} finally {
wi().setLastUsedWalker(savedWalker);
}
}
return count;
}
