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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 <set>
#include <string>
#include "mongo/bson/bsonelement.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/bson/bsontypes.h"
#include "mongo/stdx/unordered_map.h"
namespace mongo {
/**
* Represents a set of types or of type aliases in the match language. The set consists of the BSON
* types as well as "number", which is an alias for all numeric BSON types (NumberInt, NumberLong,
* and so on).
*/
struct MatcherTypeSet {
static constexpr StringData kMatchesAllNumbersAlias = "number"_sd;
// Maps from the set of JSON Schema primitive types to the corresponding BSON types. Excludes
// "number" since this alias maps to a set of BSON types, and "integer" since it is not
// supported.
static const StringMap<BSONType> kJsonSchemaTypeAliasMap;
/**
* Given a mapping from string alias to BSON type, creates a MatcherTypeSet from a
* BSONElement. This BSON alias may either represent a single type (via numerical type code or
* string alias), or may be an array of types.
*
* Returns an error if the element cannot be parsed to a set of types.
*/
static StatusWith<MatcherTypeSet> parse(BSONElement, const StringMap<BSONType>& aliasMap);
/**
* Given a set of string type alias and a mapping from string alias to BSON type, returns the
* corresponding MatcherTypeSet.
*
* Returns an error if any of the string aliases are unknown.
*/
static StatusWith<MatcherTypeSet> fromStringAliases(std::set<StringData> typeAliases,
const StringMap<BSONType>& aliasMap);
/**
* Constructs an empty type set.
*/
MatcherTypeSet() = default;
/* implicit */ MatcherTypeSet(BSONType bsonType) : bsonTypes({bsonType}) {}
/**
* Returns true if 'bsonType' is present in the set.
*/
bool hasType(BSONType bsonType) const {
return (allNumbers && isNumericBSONType(bsonType)) ||
bsonTypes.find(bsonType) != bsonTypes.end();
}
/**
* Returns true if this set contains a single type or type alias. For instance, returns true if
* the set is {"number"} or {"int"}, but not if the set is empty or {"number", "string"}.
*/
bool isSingleType() const {
return (allNumbers && bsonTypes.empty()) || (!allNumbers && bsonTypes.size() == 1u);
}
bool isEmpty() const {
return !allNumbers && bsonTypes.empty();
}
void toBSONArray(BSONArrayBuilder* builder) const;
BSONArray toBSONArray() const {
BSONArrayBuilder builder;
toBSONArray(&builder);
return builder.arr();
}
bool operator==(const MatcherTypeSet& other) const {
return allNumbers == other.allNumbers && bsonTypes == other.bsonTypes;
}
bool operator!=(const MatcherTypeSet& other) const {
return !(*this == other);
}
bool allNumbers = false;
std::set<BSONType> bsonTypes;
};
} // namespace mongo
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