server_selector.h

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// Copyright (C) 2018-2019,2021 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef SERVER_SELECTOR_H
#define SERVER_SELECTOR_H

#include <cc/server_tag.h>
#include <set>
#include <string>

namespace isc {
namespace db {

class ServerSelector {
public:

    enum class Type {
        UNASSIGNED,
        ALL,
        SUBSET,
        ANY
    };

    static ServerSelector UNASSIGNED() {
        ServerSelector selector(Type::UNASSIGNED);
        return (selector);
    }

    static ServerSelector ALL() {
        ServerSelector selector(Type::ALL);
        return (selector);
    }

    static ServerSelector ONE(const std::string& server_tag) {
        ServerSelector selector((data::ServerTag(server_tag)));
        return (selector);
    }

    static ServerSelector MULTIPLE(const std::set<std::string>& server_tags);

    static ServerSelector ANY() {
        ServerSelector selector(Type::ANY);
        return (selector);
    }

    Type getType() const {
        return (type_);
    }

    std::set<data::ServerTag> getTags() const {
        return (tags_);
    }

    bool hasNoTags() const {
        return (tags_.empty());
    }

    bool amUnassigned() const {
        return (getType() == Type::UNASSIGNED);
    }

    bool amAll() const {
        return (getType() == Type::ALL);
    }

    bool amAny() const {
        return (getType() == Type::ANY);
    }

    bool hasMultipleTags() const {
        return (tags_.size() > 1);
    }

private:

    explicit ServerSelector(const Type& type);

    explicit ServerSelector(const data::ServerTag& server_tag);

    explicit ServerSelector(const std::set<data::ServerTag>& server_tags);

    Type type_;

    std::set<data::ServerTag> tags_;
};


} // end of namespace isc::db
} // end of namespace isc

#endif