if (contextSet.getDocumentSet().intersection(
outerNodeSet.getDocumentSet()).getDocumentCount() == 0)
{LOG.info("contextSet and outerNodeSet don't share any document");}
final NewArrayNodeSet temp = new NewArrayNodeSet(100);
for (final SequenceIterator i = ancestors.iterate(); i.hasNext();) {
NodeProxy p = (NodeProxy) i.nextItem();
ContextItem contextNode = p.getContext();
temp.reset();
while (contextNode != null) {
if (contextNode.getContextId() == getExpressionId())
{temp.add(contextNode.getNode());}
contextNode = contextNode.getNextDirect();
}
p.clearContext(getExpressionId());
// TODO : understand why we sort here...
temp.sortInDocumentOrder();
for (final SequenceIterator j = innerSeq.iterate(); j.hasNext();) {
final NumericValue v = (NumericValue) j.nextItem();
// Non integers return... nothing, not even an error !
if (!v.hasFractionalPart() && !v.isZero()) {
// ... whereas we don't want a sorted array here
// TODO : rename this method as getInDocumentOrder ? -pb
p = temp.get(v.getInt() - 1);
if (p != null) {
result.add(p);
}
// TODO : does null make sense here ? Well... sometimes ;-)
}
}
}
break;
}
default:
for (final SequenceIterator i = outerSequence.iterate(); i.hasNext();) {
NodeProxy p = (NodeProxy) i.nextItem();
Sequence temp;
boolean reverseAxis = true;
switch (mode) {
case Constants.ANCESTOR_AXIS:
temp = contextSet.selectAncestors(p, false, Expression.IGNORE_CONTEXT);
break;
case Constants.ANCESTOR_SELF_AXIS:
temp = contextSet.selectAncestors(p, true, Expression.IGNORE_CONTEXT);
break;
case Constants.PARENT_AXIS:
// TODO : understand why the contextSet is not involved
// here
// NodeProxy.getParent returns a *theoretical* parent
// which is *not* guaranteed to be in the context set !
temp = p.getParents(Expression.NO_CONTEXT_ID);
break;
case Constants.PRECEDING_AXIS:
temp = contextSet.selectPreceding(p, Expression.IGNORE_CONTEXT);
break;
case Constants.PRECEDING_SIBLING_AXIS:
temp = contextSet.selectPrecedingSiblings(p, Expression.IGNORE_CONTEXT);
break;
case Constants.FOLLOWING_SIBLING_AXIS:
temp = contextSet.selectFollowingSiblings(p, Expression.IGNORE_CONTEXT);
reverseAxis = false;
break;
case Constants.FOLLOWING_AXIS:
temp = contextSet.selectFollowing(p, Expression.IGNORE_CONTEXT);
reverseAxis = false;
break;
case Constants.SELF_AXIS:
temp = p;
reverseAxis = false;
break;
default:
throw new IllegalArgumentException("Tried to test unknown axis");
}
if (!temp.isEmpty()) {
for (final SequenceIterator j = innerSeq.iterate(); j.hasNext();) {
final NumericValue v = (NumericValue) j.nextItem();
// Non integers return... nothing, not even an error !
if (!v.hasFractionalPart() && !v.isZero()) {
final int pos = (reverseAxis ?
temp.getItemCount() - v.getInt() : v.getInt() - 1);
// Other positions are ignored
if (pos >= 0 && pos < temp.getItemCount()) {
final NodeProxy t = (NodeProxy) temp.itemAt(pos);
// for the current context: filter out those
// context items not selected by the positional predicate
ContextItem ctx = t.getContext();
t.clearContext(Expression.IGNORE_CONTEXT);
while (ctx != null) {
if (ctx.getContextId() == outerContextId) {
if (ctx.getNode().getNodeId().equals(p.getNodeId()))
{t.addContextNode(outerContextId, ctx.getNode());}
} else
{t.addContextNode(ctx.getContextId(), ctx.getNode());}
ctx = ctx.getNextDirect();
}
result.add(t);
}
}