~drizzle-trunk/drizzle/development

/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2010 Brian Aker

 *

 *  This program 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; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  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 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 St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#ifndef PLUGIN_SCHEMA_ENGINE_SCHEMA_H

#define PLUGIN_SCHEMA_ENGINE_SCHEMA_H

#include <assert.h>

#include <drizzled/plugin/storage_engine.h>

#include <boost/unordered_map.hpp>

#include <boost/thread/shared_mutex.hpp>

extern const drizzled::CHARSET_INFO *default_charset_info;

static const char *schema_exts[] = {

  NULL

};

class Schema : public drizzled::plugin::StorageEngine

{

  bool writeSchemaFile(const drizzled::SchemaIdentifier &schema_identifier, const drizzled::message::Schema &db);

  bool readSchemaFile(const drizzled::SchemaIdentifier &schema_identifier, drizzled::message::Schema &schema);

  void prime();

  typedef boost::unordered_map<std::string, drizzled::message::SchemaPtr> SchemaCache;

  SchemaCache schema_cache;

  bool schema_cache_filled;

  boost::shared_mutex mutex;

public:

  Schema();

  ~Schema();

  bool doCanCreateTable(const drizzled::TableIdentifier &identifier);

  drizzled::Cursor *create(drizzled::Table &)

  {

    return NULL;

  }

  void doGetSchemaIdentifiers(drizzled::SchemaIdentifiers &set_of_names);

  bool doGetSchemaDefinition(const drizzled::SchemaIdentifier&, drizzled::message::SchemaPtr &proto);

  bool doCreateSchema(const drizzled::message::Schema &schema_message);

  bool doAlterSchema(const drizzled::message::Schema &schema_message);

  bool doDropSchema(const drizzled::SchemaIdentifier&);

  // Below are table methods that we don't implement (and don't need)

  int doGetTableDefinition(drizzled::Session&,

                           const drizzled::TableIdentifier&,

                           drizzled::message::Table&)

  {

    return ENOENT;

  }

  bool doDoesTableExist(drizzled::Session&, const drizzled::TableIdentifier&)

  {

    return false;

  }

  int doRenameTable(drizzled::Session&, const drizzled::TableIdentifier&, const drizzled::TableIdentifier&)

  {

    return EPERM;

  }

  int doCreateTable(drizzled::Session&,

                    drizzled::Table&,

                    const drizzled::TableIdentifier&,

                    drizzled::message::Table&)

  {

    return EPERM;

  }

  int doDropTable(drizzled::Session&, const drizzled::TableIdentifier&)

  {

    return 0;

  }

  const char **bas_ext() const 

  {

    return schema_exts;

  }

  void get_auto_increment(uint64_t, uint64_t,

                          uint64_t,

                          uint64_t *,

                          uint64_t *)

  {}

  void doGetTableIdentifiers(drizzled::CachedDirectory &directory,

                             const drizzled::SchemaIdentifier &schema_identifier,

                             drizzled::TableIdentifiers &set_of_identifiers);

};

#endif /* PLUGIN_SCHEMA_ENGINE_SCHEMA_H */