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/**
* Copyright (C) 2015 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 <boost/optional.hpp>
#include <string>
#include "mongo/db/jsobj.h"
#include "mongo/db/namespace_string.h"
namespace mongo {
template <typename T>
class StatusWith;
/**
* A description of a request for a count operation. Copyable.
*/
class CountRequest {
public:
/**
* Construct an empty request.
*/
CountRequest(NamespaceString nss, BSONObj query);
const NamespaceString& getNs() const {
return _nss;
}
BSONObj getQuery() const {
return _query;
}
long long getLimit() const {
return _limit.value_or(0);
}
void setLimit(long long limit) {
_limit = limit;
}
long long getSkip() const {
return _skip.value_or(0);
}
void setSkip(long long skip) {
_skip = skip;
}
BSONObj getHint() const {
return _hint.value_or(BSONObj());
}
void setHint(BSONObj hint);
BSONObj getCollation() const {
return _collation.value_or(BSONObj());
}
void setCollation(BSONObj collation);
bool isExplain() const {
return _explain;
}
void setExplain(bool explain) {
_explain = explain;
}
const std::string& getComment() const {
return _comment;
}
void setComment(StringData comment) {
_comment = comment.toString();
}
unsigned int getMaxTimeMS() const {
return _maxTimeMS;
}
void setMaxTimeMS(unsigned int maxTimeMS) {
_maxTimeMS = maxTimeMS;
}
BSONObj getReadConcern() const {
return _readConcern;
}
void setReadConcern(BSONObj readConcern) {
_readConcern = readConcern.getOwned();
}
BSONObj getUnwrappedReadPref() const {
return _unwrappedReadPref;
}
void setUnwrappedReadPref(BSONObj unwrappedReadPref) {
_unwrappedReadPref = unwrappedReadPref.getOwned();
}
/**
* Converts this CountRequest into an aggregation.
*/
StatusWith<BSONObj> asAggregationCommand() const;
/**
* Construct a CountRequest from the command specification and namespace string. Caller must
* already have parsed the first (command) field. Indicate if this is an explained count via
* 'isExplain'.
*/
static StatusWith<CountRequest> parseFromBSON(const NamespaceString& nss,
const BSONObj& cmdObj,
bool isExplain);
private:
// Namespace to operate on (e.g. "foo.bar").
const NamespaceString _nss;
// A predicate describing the set of documents to count.
const BSONObj _query;
// Optional. An integer limiting the number of documents to count.
boost::optional<long long> _limit;
// Optional. An integer indicating to not include the first n documents in the count.
boost::optional<long long> _skip;
// Optional. Indicates to the query planner that it should generate a count plan using a
// particular index.
boost::optional<BSONObj> _hint;
// Optional. The collation used to compare strings.
boost::optional<BSONObj> _collation;
BSONObj _readConcern;
// The unwrapped readPreference object, if one was given to us by the mongos command processor.
// This object will be empty when no readPreference is specified or if the request does not
// originate from mongos.
BSONObj _unwrappedReadPref;
// When non-empty, represents a user comment.
std::string _comment;
// A user-specified maxTimeMS limit, or a value of '0' if not specified.
unsigned int _maxTimeMS = 0;
// If true, generate an explain plan instead of the actual count.
bool _explain = false;
};
} // namespace mongo
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