Status UpdateDriver::parse(const BSONObj& updateExpr) {
clear();
// Check if the update expression is a full object replacement.
if (*updateExpr.firstElementFieldName() != '$') {
if (_multi) {
return Status(ErrorCodes::FailedToParse,
"multi update only works with $ operators");
}
// Modifiers expect BSONElements as input. But the input to object replace is, by
// definition, an object. We wrap the 'updateExpr' as the mod is expecting. Note
// that the wrapper is temporary so the object replace mod should make a copy of
// the object.
auto_ptr<ModifierObjectReplace> mod(new ModifierObjectReplace);
BSONObj wrapper = BSON( "dummy" << updateExpr );
Status status = mod->init(wrapper.firstElement(), _modOptions);
if (!status.isOK()) {
return status;
}
_mods.push_back(mod.release());
// Register the fact that this driver will only do full object replacements.
_replacementMode = true;
return Status::OK();
}
// The update expression is made of mod operators, that is
// { <$mod>: {...}, <$mod>: {...}, ... }
BSONObjIterator outerIter(updateExpr);
while (outerIter.more()) {
BSONElement outerModElem = outerIter.next();
// Check whether this is a valid mod type.
modifiertable::ModifierType modType = modifiertable::getType(outerModElem.fieldName());
if (modType == modifiertable::MOD_UNKNOWN) {
return Status(ErrorCodes::FailedToParse, "unknown modifier type");
}
// Check whether there is indeed a list of mods under this modifier.
if (outerModElem.type() != Object) {
return Status(ErrorCodes::FailedToParse, "List of mods must be an object");
}
// Check whether there are indeed mods under this modifier.
if (outerModElem.embeddedObject().isEmpty()) {
return Status(ErrorCodes::FailedToParse, "Empty expression after update $mod");
}
BSONObjIterator innerIter(outerModElem.embeddedObject());
while (innerIter.more()) {
BSONElement innerModElem = innerIter.next();
if (innerModElem.eoo()) {
return Status(ErrorCodes::FailedToParse,
"empty entry in $mod expression list");
}
auto_ptr<ModifierInterface> mod(modifiertable::makeUpdateMod(modType));
dassert(mod.get());
Status status = mod->init(innerModElem, _modOptions);
if (!status.isOK()) {
return status;
}
_mods.push_back(mod.release());
}
}
// Register the fact that there will be only $mod's in this driver -- no object
// replacement.
_replacementMode = false;
return Status::OK();
}
Status UpdateDriver::parse(const BSONObj& updateExpr) {
clear();
// Check if the update expression is a full object replacement.
if (*updateExpr.firstElementFieldName() != '$') {
if (_multi) {
return Status(ErrorCodes::FailedToParse,
"multi update only works with $ operators");
}
// Modifiers expect BSONElements as input. But the input to object replace is, by
// definition, an object. We wrap the 'updateExpr' as the mod is expecting. Note
// that the wrapper is temporary so the object replace mod should make a copy of
// the object.
auto_ptr<ModifierObjectReplace> mod(new ModifierObjectReplace);
BSONObj wrapper = BSON( "dummy" << updateExpr );
Status status = mod->init(wrapper.firstElement(), _modOptions);
if (!status.isOK()) {
return status;
}
_mods.push_back(mod.release());
// Register the fact that this driver will only do full object replacements.
_replacementMode = true;
return Status::OK();
}
// The update expression is made of mod operators, that is
// { <$mod>: {...}, <$mod>: {...}, ... }
BSONObjIterator outerIter(updateExpr);
while (outerIter.more()) {
BSONElement outerModElem = outerIter.next();
// Check whether this is a valid mod type.
modifiertable::ModifierType modType = modifiertable::getType(outerModElem.fieldName());
if (modType == modifiertable::MOD_UNKNOWN) {
return Status(ErrorCodes::FailedToParse,
str::stream() << "Unknown modifier: " << outerModElem.fieldName());
}
// Check whether there is indeed a list of mods under this modifier.
if (outerModElem.type() != Object) {
return Status(ErrorCodes::FailedToParse,
str::stream() << "Modifiers operate on fields but we found a "
<< typeName(outerModElem.type())
<< " instead. For example: {$mod: {<field>: ...}}"
<< " not {" << outerModElem.toString() << "}");
}
// Check whether there are indeed mods under this modifier.
if (outerModElem.embeddedObject().isEmpty()) {
return Status(ErrorCodes::FailedToParse,
str::stream() << "'" << outerModElem.fieldName()
<< "' is empty. You must specify a field like so: "
"{$mod: {<field>: ...}}");
}
BSONObjIterator innerIter(outerModElem.embeddedObject());
while (innerIter.more()) {
BSONElement innerModElem = innerIter.next();
Status status = addAndParse(modType, innerModElem);
if (!status.isOK()) {
return status;
}
}
}
// Register the fact that there will be only $mod's in this driver -- no object
// replacement.
_replacementMode = false;
return Status::OK();
}
