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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/matcher/expression_expr.h"
namespace mongo {
ExprMatchExpression::ExprMatchExpression(BSONElement elem,
const boost::intrusive_ptr<ExpressionContext>& expCtx)
: MatchExpression(MatchType::EXPRESSION),
_expCtx(expCtx),
_expression(Expression::parseOperand(expCtx, elem, expCtx->variablesParseState)) {}
bool ExprMatchExpression::matches(const MatchableDocument* doc, MatchDetails* details) const {
Document document(doc->toBSON());
auto value = _expression->evaluate(document);
return value.coerceToBool();
}
void ExprMatchExpression::serialize(BSONObjBuilder* out) const {
*out << "$expr" << _expression->serialize(false);
}
bool ExprMatchExpression::equivalent(const MatchExpression* other) const {
if (other->matchType() != matchType()) {
return false;
}
const ExprMatchExpression* realOther = static_cast<const ExprMatchExpression*>(other);
if (!CollatorInterface::collatorsMatch(_expCtx->getCollator(),
realOther->_expCtx->getCollator())) {
return false;
}
// TODO SERVER-30982: Add mechanism to allow for checking Expression equivalency.
return ValueComparator().evaluate(_expression->serialize(false) ==
realOther->_expression->serialize(false));
}
std::unique_ptr<MatchExpression> ExprMatchExpression::shallowClone() const {
// TODO SERVER-31003: Replace Expression clone via serialization with Expression::clone().
BSONObjBuilder bob;
bob << "" << _expression->serialize(false);
boost::intrusive_ptr<Expression> clonedExpr =
Expression::parseOperand(_expCtx, bob.obj().firstElement(), _expCtx->variablesParseState);
return stdx::make_unique<ExprMatchExpression>(std::move(clonedExpr), _expCtx);
}
MatchExpression::ExpressionOptimizerFunc ExprMatchExpression::getOptimizer() const {
return [](std::unique_ptr<MatchExpression> expression) {
auto& exprMatchExpr = static_cast<ExprMatchExpression&>(*expression);
exprMatchExpr._expression = exprMatchExpr._expression->optimize();
return expression;
};
}
} // namespace mongo
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