bool ComparisonMatchExpression::matchesSingleElement(const BSONElement& e) const {
if (e.canonicalType() != _rhs.canonicalType()) {
// some special cases
// jstNULL and undefined are treated the same
if (e.canonicalType() + _rhs.canonicalType() == 5) {
return matchType() == EQ || matchType() == LTE || matchType() == GTE;
}
if (_rhs.type() == MaxKey || _rhs.type() == MinKey) {
return matchType() != EQ;
}
return false;
}
// Special case handling for NaN. NaN is equal to NaN but
// otherwise always compares to false.
if (std::isnan(e.numberDouble()) || std::isnan(_rhs.numberDouble())) {
bool bothNaN = std::isnan(e.numberDouble()) && std::isnan(_rhs.numberDouble());
switch (matchType()) {
case LT:
return false;
case LTE:
return bothNaN;
case EQ:
return bothNaN;
case GT:
return false;
case GTE:
return bothNaN;
default:
// This is a comparison match expression, so it must be either
// a $lt, $lte, $gt, $gte, or equality expression.
fassertFailed(17448);
}
}
int x = compareElementValues(e, _rhs, _collator);
switch (matchType()) {
case LT:
return x < 0;
case LTE:
return x <= 0;
case EQ:
return x == 0;
case GT:
return x > 0;
case GTE:
return x >= 0;
default:
// This is a comparison match expression, so it must be either
// a $lt, $lte, $gt, $gte, or equality expression.
fassertFailed(16828);
}
}
/* wo = "well ordered" */
int BSONElement::woCompare( const BSONElement &e,
bool considerFieldName ) const {
int lt = (int) canonicalType();
int rt = (int) e.canonicalType();
int x = lt - rt;
if( x != 0 && (!isNumber() || !e.isNumber()) )
return x;
if ( considerFieldName ) {
x = strcmp(fieldName(), e.fieldName());
if ( x != 0 )
return x;
}
x = compareElementValues(*this, e);
return x;
}
int BSONElement::woCompare( const BSONElement &e,
bool considerFieldName ) const {
int lt = (int) type();
if ( lt == NumberInt ) lt = NumberDouble;
int rt = (int) e.type();
if ( rt == NumberInt ) rt = NumberDouble;
int x = lt - rt;
if ( x != 0 )
return x;
if ( considerFieldName ) {
x = strcmp(fieldName(), e.fieldName());
if ( x != 0 )
return x;
}
x = compareElementValues(*this, e);
return x;
}
bool ComparisonMatchExpression::matchesSingleElement( const BSONElement& e ) const {
//log() << "\t ComparisonMatchExpression e: " << e << " _rhs: " << _rhs << "\n"
//<< toString() << std::endl;
if ( e.canonicalType() != _rhs.canonicalType() ) {
// some special cases
// jstNULL and undefined are treated the same
if ( e.canonicalType() + _rhs.canonicalType() == 5 ) {
return matchType() == EQ || matchType() == LTE || matchType() == GTE;
}
if ( _rhs.type() == MaxKey || _rhs.type() == MinKey ) {
return matchType() != EQ;
}
return false;
}
if ( _rhs.type() == Array ) {
if ( matchType() != EQ ) {
return false;
}
}
int x = compareElementValues( e, _rhs );
//log() << "\t\t" << x << endl;
switch ( matchType() ) {
case LT:
return x < 0;
case LTE:
return x <= 0;
case EQ:
return x == 0;
case GT:
return x > 0;
case GTE:
return x >= 0;
default:
throw 1;
}
throw 1;
}
