ResourceHandler.hpp

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/*
 * =====================================================================================
 *
 *       Filename:  ResourceHandler.hpp
 *
 *    Description:
 *
 *        Created:  17/01/2018 19:16:19
 *
 *         Author:  Quentin Bazin, <quent42340@gmail.com>
 *
 * =====================================================================================
 */
#ifndef GK_RESOURCEHANDLER_HPP_
#define GK_RESOURCEHANDLER_HPP_

#include <map>
#include <memory>

#include "gk/core/XMLFile.hpp"
#include "gk/resource/IResourceLoader.hpp"
#include "gk/core/Exception.hpp"

namespace gk {

class ResourceHandler {
    public:
        template<typename T, typename... Args>
        T &add(const std::string &name, Args &&...args) {
            if(has(name)) {
                throw EXCEPTION("A resource of type", typeid(T).name(), "already exists with name:", name);
            }

            m_resources.emplace(name, std::make_shared<T>(std::forward<Args>(args)...));

            return get<T>(name);
        }

        bool has(const std::string &name) {
            return m_resources.count(name) == 1;
        }

        template<typename T>
        T &get(const std::string &name) {
            auto it = m_resources.find(name);
            if(it == m_resources.end()) {
                throw EXCEPTION("Unable to find resource with name:", name);
            }

            return *std::static_pointer_cast<T>(it->second);
        }

        template<typename ResourceLoader>
        static auto loadConfigFile(const char *xmlFilename) -> typename std::enable_if<std::is_base_of<IResourceLoader, ResourceLoader>::value>::type {
            ResourceLoader loader;
            loader.load(xmlFilename, getInstance());
        }

        static ResourceHandler &getInstance();

        static void setInstance(ResourceHandler &handler);

    private:
        static ResourceHandler *instance;

        std::map<std::string, std::shared_ptr<void>> m_resources;
};

} // namespace gk

#endif // GK_RESOURCEHANDLER_HPP_