NameIdMapper.h

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/* -*- c++ -*-
 * Copyright (C) 2007-2015 Hypertable, Inc.
 *
 * This file is part of Hypertable.
 *
 * Hypertable is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 3 of the
 * License, or any later version.
 *
 * Hypertable 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifndef Hypertable_Lib_NameIdMapper_h
#define Hypertable_Lib_NameIdMapper_h

#include <Common/Compat.h>

#include "NamespaceListing.h"

#include <Hyperspace/Session.h>

#include <Common/String.h>

#include <memory>
#include <mutex>
#include <vector>

namespace Hyperspace {
  class Session;
}

namespace Hypertable {

  class NameIdMapper {

  public:

    enum Flag { IS_NAMESPACE=0x0001, CREATE_INTERMEDIATE=0x0002 };

    NameIdMapper(Hyperspace::SessionPtr &hyperspace, const std::string &toplevel_dir);
    bool name_to_id(const std::string &name, std::string &id, bool *is_namespacep=0);

    bool id_to_name(const std::string &id, std::string &name, bool *is_namespacep=0);

    void id_to_sublisting(const std::string &id, bool include_sub_entries, std::vector<NamespaceListing> &listing);

    void add_mapping(const std::string &name, std::string &id, int flags=0, bool ignore_exists=false);

    void drop_mapping(const std::string &name);

    bool exists_mapping(const std::string &name, bool *is_namespace);

    void rename(const std::string &old_name, const std::string &new_name);

    void add_entry(const std::string &names_parent, const std::string &names_entry,
                   std::vector<uint64_t> &ids, bool is_namespace);

  protected:
    bool do_mapping(const std::string &input, bool id_in, std::string &output, bool *is_namespacep);
    static void get_namespace_listing(const std::vector<Hyperspace::DirEntryAttr> &dir_listing, std::vector<NamespaceListing> &listing);

    std::mutex m_mutex;
    Hyperspace::SessionPtr m_hyperspace;
    std::string m_toplevel_dir;
    std::string m_names_dir;
    std::string m_ids_dir;
    size_t m_prefix_components;
  };

  typedef std::shared_ptr<NameIdMapper> NameIdMapperPtr;

}

#endif // Hypertable_Lib_NameIdMapper_h