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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.
*/
#pragma once
#include "mongo/db/matcher/expression.h"
namespace mongo {
class AlwaysBooleanMatchExpression : public MatchExpression {
public:
AlwaysBooleanMatchExpression(MatchType type, bool value)
: MatchExpression(type), _value(value) {}
virtual ~AlwaysBooleanMatchExpression() = default;
/**
* The name of this MatchExpression.
*/
virtual StringData name() const = 0;
bool matches(const MatchableDocument* doc, MatchDetails* details = nullptr) const final {
return _value;
}
bool matchesSingleElement(const BSONElement&, MatchDetails* details = nullptr) const final {
return _value;
}
void debugString(StringBuilder& debug, int level = 0) const final {
_debugAddSpace(debug, level);
debug << name() << ": 1\n";
}
void serialize(BSONObjBuilder* out) const final {
out->append(name(), 1);
}
bool equivalent(const MatchExpression* other) const final {
return other->matchType() == matchType();
}
MatchCategory getCategory() const final {
return MatchCategory::kOther;
}
size_t numChildren() const override {
return 0;
}
MatchExpression* getChild(size_t i) const override {
MONGO_UNREACHABLE;
}
std::vector<MatchExpression*>* getChildVector() override {
return nullptr;
}
private:
ExpressionOptimizerFunc getOptimizer() const final {
return [](std::unique_ptr<MatchExpression> expression) { return expression; };
}
bool _value;
};
class AlwaysFalseMatchExpression final : public AlwaysBooleanMatchExpression {
public:
static constexpr StringData kName = "$alwaysFalse"_sd;
AlwaysFalseMatchExpression() : AlwaysBooleanMatchExpression(MatchType::ALWAYS_FALSE, false) {}
StringData name() const final {
return kName;
}
std::unique_ptr<MatchExpression> shallowClone() const final {
return stdx::make_unique<AlwaysFalseMatchExpression>();
}
};
class AlwaysTrueMatchExpression final : public AlwaysBooleanMatchExpression {
public:
static constexpr StringData kName = "$alwaysTrue"_sd;
AlwaysTrueMatchExpression() : AlwaysBooleanMatchExpression(MatchType::ALWAYS_TRUE, true) {}
StringData name() const final {
return kName;
}
std::unique_ptr<MatchExpression> shallowClone() const final {
return stdx::make_unique<AlwaysTrueMatchExpression>();
}
};
} // namespace mongo
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