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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/compare_node.h"
#include "mongo/db/query/collation/collator_interface.h"
namespace mongo {
Status CompareNode::init(BSONElement modExpr,
const boost::intrusive_ptr<ExpressionContext>& expCtx) {
invariant(modExpr.ok());
_val = modExpr;
setCollator(expCtx->getCollator());
return Status::OK();
}
void CompareNode::setCollator(const CollatorInterface* collator) {
invariant(!_collator);
_collator = collator;
}
ModifierNode::ModifyResult CompareNode::updateExistingElement(
mutablebson::Element* element, std::shared_ptr<FieldRef> elementPath) const {
const auto compareVal = element->compareWithBSONElement(_val, _collator, false);
if ((compareVal == 0) || ((_mode == CompareMode::kMax) ? (compareVal > 0) : (compareVal < 0))) {
return ModifyResult::kNoOp;
} else {
invariant(element->setValueBSONElement(_val));
return ModifyResult::kNormalUpdate;
}
}
void CompareNode::setValueForNewElement(mutablebson::Element* element) const {
invariant(element->setValueBSONElement(_val));
}
} // namespace mongo
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