/*
private bool SplitQuery(BaseAxisQuery origQuery, BaseAxisQuery parent, BaseAxisQuery input) {
parent = origQuery as BaseAxisQuery;
if (parent == null || parent is GroupQuery || parent is PositionQuery || parent is OrQuery) {
return false;
}
input = parent = (BaseAxisQuery)parent.Clone();
parent = (BaseAxisQuery) parent.m_qyInput;
while (parent != null && !parent.IsAxis) {
parent = (BaseAxisQuery)parent.m_qyInput;
}
if (parent == null) {
return false;
}
BaseAxisQuery temp = (BaseAxisQuery)parent.m_qyInput;
if (temp == null) {
return false;
}
parent.m_qyInput = null;
parent = temp;
return true;
}
*/
private IQuery ProcessFilter(Filter root, ref bool cache, ref bool position) {
bool _cache = false;
bool merge = false;
bool _position = false;
_specialAxis = false;
bool filterflag = true;
bool first = (filterCount == 0);
IQuery opnd = ProcessNode(root.Condition, null, Regular_D,
Axis.AxisType.None, ref _cache, ref _position);
filterCount++;
if (root.Condition.ReturnType == XPathResultType.Error ) {
_position = true;
}
if (root.Condition.ReturnType == XPathResultType.Number ||
_cache || _position ) {
hasPosition = true;
filterflag = false;
_smart = 0;
}
IQuery qyInput = ProcessNode(root.Input, null, Regular_D,
Axis.AxisType.None, ref cache, ref position );
if (hasPosition && qyInput is CacheQuery) {
qyInput = ((CacheQuery)qyInput).m_qyInput;
}
if (firstInput == null) {
firstInput = qyInput as BaseAxisQuery;
}
_smart = 2;
merge = qyInput.Merge;
if (_cache || _position) {
hasPosition = true;
if (hasReverseAxis) {
if (merge) {
qyInput = new ReversePositionQuery(qyInput);
}
else if (_cache) {
qyInput = new ForwardPositionQuery(qyInput);
}
}
else {
if (_cache) {
qyInput = new ForwardPositionQuery(qyInput);
}
}
}
else if (root.Condition.ReturnType == XPathResultType.Number ) {
hasPosition = true;
if (hasReverseAxis && merge) {
qyInput = new ReversePositionQuery(qyInput);
}
}
if (first && firstInput != null) {
if (merge && hasPosition) {
qyInput = new FilterQuery(qyInput, opnd);
IQuery parent = firstInput.m_qyInput;
if (parent == null || !firstInput.Merge) {
firstInput = null;
return qyInput;
}
IQuery input = qyInput;
qyInput = qyInput.Clone();
firstInput.m_qyInput = null;
firstInput = null;
return new MergeFilterQuery(parent, input);
}
firstInput = null;
}
return new FilterQuery(qyInput, opnd, filterflag);
}