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/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/update/bit_node.h"
#include "mongo/bson/mutable/algorithm.h"
namespace mongo {
Status BitNode::init(BSONElement modExpr, const boost::intrusive_ptr<ExpressionContext>& expCtx) {
invariant(modExpr.ok());
if (modExpr.type() != mongo::Object) {
return Status(ErrorCodes::BadValue,
str::stream() << "The $bit modifier is not compatible with a "
<< typeName(modExpr.type())
<< ". You must pass in an embedded document: "
"{$bit: {field: {and/or/xor: #}}");
}
for (const auto& curOp : modExpr.embeddedObject()) {
const StringData payloadFieldName = curOp.fieldNameStringData();
BitwiseOp parsedOp;
if (payloadFieldName == "and") {
parsedOp.bitOperator = &SafeNum::bitAnd;
} else if (payloadFieldName == "or") {
parsedOp.bitOperator = &SafeNum::bitOr;
} else if (payloadFieldName == "xor") {
parsedOp.bitOperator = &SafeNum::bitXor;
} else {
return Status(ErrorCodes::BadValue,
str::stream()
<< "The $bit modifier only supports 'and', 'or', and 'xor', not '"
<< payloadFieldName
<< "' which is an unknown operator: {"
<< curOp
<< "}");
}
if ((curOp.type() != mongo::NumberInt) && (curOp.type() != mongo::NumberLong)) {
return Status(ErrorCodes::BadValue,
str::stream()
<< "The $bit modifier field must be an Integer(32/64 bit); a '"
<< typeName(curOp.type())
<< "' is not supported here: {"
<< curOp
<< "}");
}
parsedOp.operand = SafeNum(curOp);
_opList.push_back(parsedOp);
}
if (_opList.empty()) {
return Status(ErrorCodes::BadValue,
str::stream() << "You must pass in at least one bitwise operation. "
<< "The format is: "
"{$bit: {field: {and/or/xor: #}}");
}
return Status::OK();
}
ModifierNode::ModifyResult BitNode::updateExistingElement(
mutablebson::Element* element, std::shared_ptr<FieldRef> elementPath) const {
if (!element->isIntegral()) {
mutablebson::Element idElem =
mutablebson::findFirstChildNamed(element->getDocument().root(), "_id");
uasserted(ErrorCodes::BadValue,
str::stream() << "Cannot apply $bit to a value of non-integral type."
<< idElem.toString()
<< " has the field "
<< element->getFieldName()
<< " of non-integer type "
<< typeName(element->getType()));
}
SafeNum value = applyOpList(element->getValueSafeNum());
if (!value.isIdentical(element->getValueSafeNum())) {
invariantOK(element->setValueSafeNum(value));
return ModifyResult::kNormalUpdate;
} else {
return ModifyResult::kNoOp;
}
}
void BitNode::setValueForNewElement(mutablebson::Element* element) const {
SafeNum value = applyOpList(SafeNum(static_cast<int32_t>(0)));
invariantOK(element->setValueSafeNum(value));
}
SafeNum BitNode::applyOpList(SafeNum value) const {
for (const auto& op : _opList) {
value = (value.*(op.bitOperator))(op.operand);
if (!value.isValid()) {
uasserted(ErrorCodes::BadValue,
str::stream() << "Failed to apply $bit operations to current value: "
<< value.debugString());
}
}
return value;
}
} // namespace mongo
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