BESPluginFactory.h

// BESPluginFactory.h
 
// This file is part of bes, A C++ back-end server implementation framework
// for the OPeNDAP Data Access Protocol.
 
// Copyright (c) 2004-2009 University Corporation for Atmospheric Research
// Author: Patrick West <pwest@ucar.edu> and Jose Garcia <jgarcia@ucar.edu>
// and James Gallagher <jgallagher@gso.uri.edu>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 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
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// You can contact University Corporation for Atmospheric Research at
// 3080 Center Green Drive, Boulder, CO 80301
 
// (c) COPYRIGHT University Corporation for Atmospheric Research 2004-2005
// Please read the full copyright statement in the file COPYRIGHT_UCAR.
//
// Authors:
//      pwest       Patrick West <pwest@ucar.edu>
//      jgarcia     Jose Garcia <jgarcia@ucar.edu>
//      jimg        James Gallagher <jgallagher@gso.uri.edu>
 
#ifndef plugin_factory_h
#define plugin_factory_h
 
#include <string>
#include <map>
#include <memory>
 
#include "BESPlugin.h"
 
#include "BESObj.h"

 
template<typename C>
class BESPluginFactory : public BESObj {
    std::map<std::string, std::unique_ptr<BESPlugin<C>> > d_children;
 
public:
    BESPluginFactory() = default;

    BESPluginFactory(const std::string &name, const std::string &library_name) {
        add_mapping(name, library_name);
    }
 
    BESPluginFactory(const BESPluginFactory &) = delete;
 
    ~BESPluginFactory() override = default;
 
    const BESPluginFactory &operator=(const BESPluginFactory &) = delete;

    void add_mapping(const std::string &name, const std::string &library_name) {
        d_children.emplace(name, std::make_unique<BESPlugin<C>>(library_name));
    }

    C *get(const std::string &name) {
        auto plugin_it = d_children.find(name);
        if (plugin_it == d_children.end()) {
            throw NoSuchObject(std::string("No class is bound to ") + name, __FILE__, __LINE__);
        }
        return plugin_it->second->instantiate();
    }
 
    void dump(std::ostream &strm) const override {
        strm << "BESPluginFactory::dump - (" << std::ios::hex << this << ")" << std::endl;
    }
};
 
#endif //plugin_h