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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.
*/
#pragma once
#include "mongo/db/matcher/expression_leaf.h"
#include "mongo/db/matcher/matcher_type_set.h"
namespace mongo {
template <class T>
class TypeMatchExpressionBase : public LeafMatchExpression {
public:
explicit TypeMatchExpressionBase(MatchType matchType,
StringData path,
ElementPath::LeafArrayBehavior leafArrBehavior,
MatcherTypeSet typeSet)
: LeafMatchExpression(
matchType, path, leafArrBehavior, ElementPath::NonLeafArrayBehavior::kTraverse),
_typeSet(std::move(typeSet)) {}
virtual ~TypeMatchExpressionBase() = default;
/**
* Returns the name of this MatchExpression.
*/
virtual StringData name() const = 0;
std::unique_ptr<MatchExpression> shallowClone() const final {
auto expr = stdx::make_unique<T>(path(), _typeSet);
if (getTag()) {
expr->setTag(getTag()->clone());
}
return std::move(expr);
}
bool matchesSingleElement(const BSONElement& elem,
MatchDetails* details = nullptr) const final {
return _typeSet.hasType(elem.type());
}
void debugString(StringBuilder& debug, int level) const final {
_debugAddSpace(debug, level);
debug << path() << " " << name() << ": " << _typeSet.toBSONArray().toString();
MatchExpression::TagData* td = getTag();
if (td) {
debug << " ";
td->debugString(&debug);
}
debug << "\n";
}
void serialize(BSONObjBuilder* out) const final {
BSONObjBuilder subBuilder(out->subobjStart(path()));
BSONArrayBuilder arrBuilder(subBuilder.subarrayStart(name()));
_typeSet.toBSONArray(&arrBuilder);
arrBuilder.doneFast();
subBuilder.doneFast();
}
bool equivalent(const MatchExpression* other) const final {
if (matchType() != other->matchType())
return false;
auto realOther = static_cast<const T*>(other);
if (path() != realOther->path()) {
return false;
}
return _typeSet == realOther->_typeSet;
}
/**
* Returns a representation of the set of matching types.
*/
const MatcherTypeSet& typeSet() const {
return _typeSet;
}
private:
ExpressionOptimizerFunc getOptimizer() const final {
return [](std::unique_ptr<MatchExpression> expression) { return expression; };
}
// The set of matching types.
MatcherTypeSet _typeSet;
};
class TypeMatchExpression final : public TypeMatchExpressionBase<TypeMatchExpression> {
public:
static constexpr StringData kName = "$type"_sd;
TypeMatchExpression(StringData path, MatcherTypeSet typeSet)
: TypeMatchExpressionBase(MatchExpression::TYPE_OPERATOR,
path,
ElementPath::LeafArrayBehavior::kTraverse,
typeSet) {}
StringData name() const final {
return kName;
}
};
/**
* Implements matching semantics for the JSON Schema type keyword. Although the MongoDB query
* language has a $type operator, its meaning for arrays differs from JSON Schema. Therefore, we
* implement a separate type node for schema matching.
*/
class InternalSchemaTypeExpression final
: public TypeMatchExpressionBase<InternalSchemaTypeExpression> {
public:
static constexpr StringData kName = "$_internalSchemaType"_sd;
InternalSchemaTypeExpression(StringData path, MatcherTypeSet typeSet)
: TypeMatchExpressionBase(MatchExpression::INTERNAL_SCHEMA_TYPE,
path,
ElementPath::LeafArrayBehavior::kNoTraversal,
typeSet) {}
StringData name() const final {
return kName;
}
MatchCategory getCategory() const final {
return MatchCategory::kOther;
}
};
} // namespace mongo
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