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path: root/src/mongo/s/catalog/type_tags.h
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/**
 *    Copyright (C) 2012-2015 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"

namespace mongo {

    class BSONObj;
    class Status;
    template<typename T> class StatusWith;


    /**
     * This class represents the layout and contents of documents contained in the config.tags
     * collection. All manipulation of documents coming from that collection should be done with
     * this class.
     */
    class TagsType {
    public:
        // Name of the tags collection in the config server.
        static const std::string ConfigNS;

        // Field names and types in the tags collection type.
        static const BSONField<std::string> ns;
        static const BSONField<std::string> tag;
        static const BSONField<BSONObj> min;
        static const BSONField<BSONObj> max;


        /**
         * Constructs a new DatabaseType object from BSON. Validates that all required fields are
         * present.
         */
        static StatusWith<TagsType> fromBSON(const BSONObj& source);

        /**
         * Returns OK if all fields have been set. Otherwise returns NoSuchKey and information
         * about what is the first field which is missing.
         */
        Status validate() const;

        /**
         * Returns the BSON representation of the entry.
         */
        BSONObj toBSON() const;

        /**
         * Returns a std::string representation of the current internal state.
         */
        std::string toString() const;

        const std::string& getNS() const { return _ns.get(); }
        void setNS(const std::string& ns);

        const std::string& getTag() const { return _tag.get(); }
        void setTag(const std::string& tag);

        const BSONObj& getMinKey() const { return _minKey.get(); }
        void setMinKey(const BSONObj& minKey);

        const BSONObj& getMaxKey() const { return _maxKey.get(); }
        void setMaxKey(const BSONObj& max);

    private:
        // Required namespace to which this tag belongs
        boost::optional<std::string> _ns;

        // Required tag name
        boost::optional<std::string> _tag;

        // Required first key of the tag (inclusive)
        boost::optional<BSONObj> _minKey;

        // Required last key of the tag (not-inclusive)
        boost::optional<BSONObj> _maxKey;
    };

} // namespace mongo