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/**
* Copyright (C) 2021-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.
*/
#pragma once
#include "mongo/db/matcher/expression_leaf.h"
namespace mongo {
/**
* InternalExprComparisonMatchExpression consists of comparison expressions with similar semantics
* to the correlating $eq, $gt, $gte, $lt, and $lte aggregation expression. They differ from the
* regular comparison match expressions in the following ways:
*
* - There will be no type bracketing. For instance, null is considered less than 2, and objects
* are considered greater than 2.
*
* - The document will match if there is an array anywhere along the path. By always returning true
* in such cases, we match a superset of documents that the related aggregation expression would
* match. This sidesteps us having to implement field path expression evaluation as part of this
* match expression.
*
* - Comparison to NaN will consider NaN as the less than all numbers.
*
* - Comparison to an array is illegal. It is invalid usage to construct a
* InternalExprComparisonMatchExpression node which compares to an array.
*/
template <typename T>
class InternalExprComparisonMatchExpression : public ComparisonMatchExpressionBase {
public:
InternalExprComparisonMatchExpression(MatchType type,
boost::optional<StringData> path,
BSONElement value)
: ComparisonMatchExpressionBase(type,
path,
Value(value),
ElementPath::LeafArrayBehavior::kNoTraversal,
ElementPath::NonLeafArrayBehavior::kMatchSubpath) {
invariant(_rhs.type() != BSONType::Undefined);
invariant(_rhs.type() != BSONType::Array);
}
virtual ~InternalExprComparisonMatchExpression() = default;
bool matchesSingleElement(const BSONElement& elem, MatchDetails* details) const final {
// We use NonLeafArrayBehavior::kMatchSubpath traversal in
// InternalExprComparisonMatchExpression. This means matchesSinglElement() will be called
// when an array is found anywhere along the patch we are matching against. When this
// occurs, we return 'true' and depend on the corresponding ExprMatchExpression node to
// filter properly.
if (elem.type() == BSONType::Array) {
return true;
}
auto comp = elem.woCompare(_rhs, BSONElement::ComparisonRulesSet(0), _collator);
switch (matchType()) {
case INTERNAL_EXPR_GT:
return comp > 0;
case INTERNAL_EXPR_GTE:
return comp >= 0;
case INTERNAL_EXPR_LT:
return comp < 0;
case INTERNAL_EXPR_LTE:
return comp <= 0;
case INTERNAL_EXPR_EQ:
return comp == 0;
default:
// This is a comparison match expression, so it must be either a $eq, $lt, $lte, $gt
// or $gte expression.
MONGO_UNREACHABLE_TASSERT(3994308);
}
};
std::unique_ptr<MatchExpression> shallowClone() const final {
auto clone = std::make_unique<T>(path(), _rhs);
clone->setCollator(_collator);
if (getTag()) {
clone->setTag(getTag()->clone());
}
return clone;
}
StringData name() const final {
return T::kName;
};
};
class InternalExprEqMatchExpression final
: public InternalExprComparisonMatchExpression<InternalExprEqMatchExpression> {
public:
static constexpr StringData kName = "$_internalExprEq"_sd;
InternalExprEqMatchExpression(boost::optional<StringData> path, BSONElement value)
: InternalExprComparisonMatchExpression<InternalExprEqMatchExpression>(
MatchType::INTERNAL_EXPR_EQ, path, value) {}
void acceptVisitor(MatchExpressionMutableVisitor* visitor) final {
visitor->visit(this);
}
void acceptVisitor(MatchExpressionConstVisitor* visitor) const final {
visitor->visit(this);
}
};
class InternalExprGTMatchExpression final
: public InternalExprComparisonMatchExpression<InternalExprGTMatchExpression> {
public:
static constexpr StringData kName = "$_internalExprGt"_sd;
InternalExprGTMatchExpression(boost::optional<StringData> path, BSONElement value)
: InternalExprComparisonMatchExpression<InternalExprGTMatchExpression>(
MatchType::INTERNAL_EXPR_GT, path, value) {}
void acceptVisitor(MatchExpressionMutableVisitor* visitor) final {
visitor->visit(this);
}
void acceptVisitor(MatchExpressionConstVisitor* visitor) const final {
visitor->visit(this);
}
};
class InternalExprGTEMatchExpression final
: public InternalExprComparisonMatchExpression<InternalExprGTEMatchExpression> {
public:
static constexpr StringData kName = "$_internalExprGte"_sd;
InternalExprGTEMatchExpression(boost::optional<StringData> path, BSONElement value)
: InternalExprComparisonMatchExpression<InternalExprGTEMatchExpression>(
MatchType::INTERNAL_EXPR_GTE, path, value) {}
void acceptVisitor(MatchExpressionMutableVisitor* visitor) final {
visitor->visit(this);
}
void acceptVisitor(MatchExpressionConstVisitor* visitor) const final {
visitor->visit(this);
}
};
class InternalExprLTMatchExpression final
: public InternalExprComparisonMatchExpression<InternalExprLTMatchExpression> {
public:
static constexpr StringData kName = "$_internalExprLt"_sd;
InternalExprLTMatchExpression(boost::optional<StringData> path, BSONElement value)
: InternalExprComparisonMatchExpression<InternalExprLTMatchExpression>(
MatchType::INTERNAL_EXPR_LT, path, value) {}
void acceptVisitor(MatchExpressionMutableVisitor* visitor) final {
visitor->visit(this);
}
void acceptVisitor(MatchExpressionConstVisitor* visitor) const final {
visitor->visit(this);
}
};
class InternalExprLTEMatchExpression final
: public InternalExprComparisonMatchExpression<InternalExprLTEMatchExpression> {
public:
static constexpr StringData kName = "$_internalExprLte"_sd;
InternalExprLTEMatchExpression(boost::optional<StringData> path, BSONElement value)
: InternalExprComparisonMatchExpression<InternalExprLTEMatchExpression>(
MatchType::INTERNAL_EXPR_LTE, path, value) {}
void acceptVisitor(MatchExpressionMutableVisitor* visitor) final {
visitor->visit(this);
}
void acceptVisitor(MatchExpressionConstVisitor* visitor) const final {
visitor->visit(this);
}
};
} // namespace mongo
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