pluginloader.h

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/*  -*- c++ -*-
    This file is part of libkdepim.

    Copyright (c) 2002,2004 Marc Mutz <mutz@kde.org>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#ifndef PLUGINLOADER_H
#define PLUGINLOADER_H

#include "pluginloaderbase.h"
#include <KLibrary>

template< typename T, typename T_config >
class PluginLoader : public PluginLoaderBase {
protected:
  PluginLoader() : PluginLoaderBase() {}

private:
  static PluginLoader<T,T_config> * mSelf;

public:
  virtual ~PluginLoader() { mSelf = 0; }

  static PluginLoader<T,T_config> * instance() {
    if ( !mSelf ) {
      mSelf = new PluginLoader<T,T_config>();
      mSelf->scan();
    }
    return mSelf;
  }

  virtual void scan() {
    doScan( T_config::path );
  }

  virtual T * createForName( const QString & type ) const {
    KLibrary::void_function_ptr main_func = mainFunc( type, T_config::mainfunc );
    if ( !main_func ) return 0;

    // cast to a pointer to a function returning T*, call it and
    // return the result; don't you love C? ;-)
    return ((T* (*)())( main_func ))();
  }
};

template< typename T, typename T_config >
PluginLoader<T,T_config> * PluginLoader<T,T_config>::mSelf = 0;

#define DEFINE_PLUGIN_LOADER( pl, t, mf, p ) \
  namespace { /* don't pollute namespaces */ \
    struct KDE_EXPORT pl##Config { \
      static const char * const mainfunc; \
      static const char * const path; \
    }; \
    const char * const pl##Config::mainfunc = mf; \
    const char * const pl##Config::path = p; \
  } \
  typedef PluginLoader< t, pl##Config > pl; \


#endif // PLUGINLOADER_H