~drizzle-trunk/drizzle/development

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

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

 *

 *  Copyright (C) 2008 Sun Microsystems

 *

 *  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; version 2 of the License.

 *

 *  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 DRIZZLED_PLUGIN_REGISTRY_H

#define DRIZZLED_PLUGIN_REGISTRY_H

#include <string>

#include <vector>

#include <map>

#include <algorithm>

#include "drizzled/gettext.h"

#include "drizzled/unireg.h"

#include "drizzled/errmsg_print.h"

namespace drizzled

{

namespace plugin

{

class Module;

class Plugin;

class Registry

{

private:

  std::map<std::string, Module *> module_map;

  std::map<std::string, const Plugin *> plugin_registry;

  Module *current_module;

  Registry()

   : module_map(),

     plugin_registry(),

     current_module(NULL)

  { }

  Registry(const Registry&);

  Registry& operator=(const Registry&);

public:

  static plugin::Registry& singleton()

  {

    static plugin::Registry *registry= new plugin::Registry();

    return *registry;

  }

  static void shutdown()

  {

    plugin::Registry& registry= singleton();

    delete &registry;

  }

  Module *find(const LEX_STRING *name);

  void add(Module *module);

  void setCurrentModule(Module *module)

  {

    current_module= module;

  }

  void clearCurrentModule()

  {

    current_module= NULL;

  }

  std::vector<Module *> getList(bool active);

  const std::map<std::string, const Plugin *> &getPluginsMap() const

  {

    return plugin_registry;

  }

  template<class T>

  void add(T *plugin)

  {

    plugin->setModule(current_module);

    bool failed= false;

    std::string plugin_name(plugin->getName());

    std::transform(plugin_name.begin(), plugin_name.end(),

                   plugin_name.begin(), ::tolower);

    if (plugin_registry.find(plugin_name) != plugin_registry.end())

    {

      errmsg_printf(ERRMSG_LVL_ERROR,

                    _("Loading plugin %s failed: a plugin by that name already "

                      "exists."), plugin->getName().c_str());

      failed= true;

    }

    if (T::addPlugin(plugin))

      failed= true;

    if (failed)

    {

      errmsg_printf(ERRMSG_LVL_ERROR,

                    _("Fatal error: Failed initializing %s plugin."),

                    plugin->getName().c_str());

      unireg_abort(1);

    }

    plugin_registry.insert(std::pair<std::string, const Plugin *>(plugin_name, plugin));

  }

  template<class T>

  void remove(T *plugin)

  {

    std::string plugin_name(plugin->getName());

    std::transform(plugin_name.begin(), plugin_name.end(),

                   plugin_name.begin(), ::tolower);

    T::removePlugin(plugin);

    plugin_registry.erase(plugin_name);

  }

};

} /* end namespace plugin */

} /* end namespace drizzled */

#endif /* DRIZZLED_PLUGIN_REGISTRY_H */