void SimpleQueryLinker::update_results(const std::string& qvar,
const ConditionSet& new_set)
{
if(!is_initialized(qvar)) {
_qvar_table[qvar] = new_set;
} else {
ConditionSet difference = _qvar_table[qvar].difference_with(new_set);
if(!difference.is_empty()) {
for(ConditionSet::iterator it = difference.begin();
it != difference.end(); ++it )
{
remove_condition(qvar, *it);
}
}
}
}
void ConditionSet::intersect_with(const ConditionSet& other) {
if(other.is_empty()) {
// we are intersecting with empty set, and so
// the result is also an empty set.
_set.clear();
return;
}
std::set<ConditionPtr>::iterator it = _set.begin();
while(it != _set.end()) {
if(!other.has_element(*it)) {
std::set<ConditionPtr>::iterator old_it = it++;
_set.erase(old_it);
} else {
++it;
}
}
}