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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/arithmetic_node.h"
#include "mongo/bson/mutable/algorithm.h"
namespace mongo {
namespace {
const char* getNameForOp(ArithmeticNode::ArithmeticOp op) {
switch (op) {
case ArithmeticNode::ArithmeticOp::kAdd:
return "increment";
case ArithmeticNode::ArithmeticOp::kMultiply:
return "multiply";
default:
MONGO_UNREACHABLE;
}
}
} // namespace
Status ArithmeticNode::init(BSONElement modExpr,
const boost::intrusive_ptr<ExpressionContext>& expCtx) {
invariant(modExpr.ok());
if (!modExpr.isNumber()) {
return Status(ErrorCodes::TypeMismatch,
str::stream() << "Cannot " << getNameForOp(_op)
<< " with non-numeric argument: {" << modExpr << "}");
}
_val = modExpr;
return Status::OK();
}
ModifierNode::ModifyResult ArithmeticNode::updateExistingElement(
mutablebson::Element* element, std::shared_ptr<FieldRef> elementPath) const {
if (!element->isNumeric()) {
auto idElem = mutablebson::findFirstChildNamed(element->getDocument().root(), "_id");
uasserted(ErrorCodes::TypeMismatch,
str::stream() << "Cannot apply " << operatorName()
<< " to a value of non-numeric type. {"
<< (idElem.ok() ? idElem.toString() : "no id")
<< "} has the field '" << element->getFieldName()
<< "' of non-numeric type " << typeName(element->getType()));
}
SafeNum originalValue = element->getValueSafeNum();
SafeNum valueToSet = _val;
switch (_op) {
case ArithmeticOp::kAdd:
valueToSet += originalValue;
break;
case ArithmeticOp::kMultiply:
valueToSet *= originalValue;
break;
}
// If the updated value is identical to the original value, treat this as a no-op. Caveat:
// if the found element is in a deserialized state, we can't do that.
if (element->getValue().ok() && valueToSet.isIdentical(originalValue)) {
return ModifyResult::kNoOp;
} else if (!valueToSet.isValid()) {
auto idElem = mutablebson::findFirstChildNamed(element->getDocument().root(), "_id");
uasserted(ErrorCodes::BadValue,
str::stream() << "Failed to apply " << operatorName()
<< " operations to current value (" << originalValue.debugString()
<< ") for document {" << (idElem.ok() ? idElem.toString() : "no id")
<< "}");
} else {
invariant(element->setValueSafeNum(valueToSet));
return ModifyResult::kNormalUpdate;
}
}
void ArithmeticNode::setValueForNewElement(mutablebson::Element* element) const {
SafeNum valueToSet = _val;
switch (_op) {
case ArithmeticOp::kAdd:
// valueToSet += 0
break;
case ArithmeticOp::kMultiply:
// This results in a createdValue that has the same type as the original "element"
// but has a 0 value.
valueToSet *= SafeNum(static_cast<int32_t>(0));
break;
}
// This can fail if 'valueToSet' is not representable as a 64-bit integer.
uassertStatusOK(element->setValueSafeNum(valueToSet));
}
} // namespace mongo
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