💿🐜 Antkeeper source code
https://antkeeper.com
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186 lines
4.6 KiB
186 lines
4.6 KiB
/*
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* Copyright (C) 2017-2019 Christopher J. Howard
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*
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* This file is part of Antkeeper Source Code.
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*
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* Antkeeper Source Code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper Source Code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper Source Code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef RESOURCE_MANAGER_HPP
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#define RESOURCE_MANAGER_HPP
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#include "resource-handle.hpp"
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#include "resource-loader.hpp"
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#include <fstream>
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#include <list>
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#include <map>
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#include <stdexcept>
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#include <string>
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/**
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* Loads resources.
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*/
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class ResourceManager
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{
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public:
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/**
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* Creates a resource manager.
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*/
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ResourceManager();
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/**
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* Destroys a resource manager and frees all of its resources.
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*/
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~ResourceManager();
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/**
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* Adds a path to be searched when a resource is requested.
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*
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* @param path Search path.
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*/
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void include(const std::string& path);
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/**
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* Loads the requested resource. If the resource has already been loaded it will be retrieved from the resource cache and its reference count incremented.
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*
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* @tparam T Resource type.
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* @param path Path to the resource, relative to the search paths.
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* @return Pointer to the requested resource, or nullptr if the resource could not be found nor loaded.
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*/
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template <typename T>
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T* load(const std::string& path);
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/**
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* Decrements a resource's reference count and unloads the resource if it's unreferenced.
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*
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* @param path Path to the resource, relative to the search paths.
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*/
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void unload(const std::string& path);
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/**
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* Saves the specified resource.
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*
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* @tparam T Resource type.
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* @param resource Pointer to the resource.
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* @param path Path to the resource.
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*/
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template <typename T>
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void save(const T* resource, const std::string& path);
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private:
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std::map<std::string, ResourceHandleBase*> resourceCache;
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std::list<std::string> paths;
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};
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template <typename T>
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T* ResourceManager::load(const std::string& path)
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{
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// Check if resource is in the cache
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auto it = resourceCache.find(path);
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if (it != resourceCache.end())
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{
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// Resource found
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ResourceHandle<T>* resource = static_cast<ResourceHandle<T>*>(it->second);
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// Increment resource handle reference count
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++resource->referenceCount;
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// Return resource data
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return resource->data;
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}
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// Resource not found, load resource data
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T* data = nullptr;
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try
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{
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// For each directory in search paths
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bool opened = false;
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for (const std::string& directory: paths)
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{
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// Attempt to open file
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std::string fullPath = directory + path;
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std::ifstream fs;
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fs.open(fullPath.c_str(), std::ios::in | std::ios::binary);
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// If unable to open file
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if (!fs.is_open() || !fs.good())
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{
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if (fs.is_open())
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{
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fs.close();
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}
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// Try again in next search path
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continue;
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}
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// File opened, load it
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opened = true;
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data = ResourceLoader<T>::load(this, &fs);
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fs.close();
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}
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if (!opened)
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{
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throw std::runtime_error("ResourceManager::load<T>(): Unable to open file \"" + path + "\"");
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}
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}
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catch (const std::exception& e)
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{
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std::string error = std::string("ResourceManager::load<T>(): Failed to load resource \"") + path + std::string("\": \"") + e.what() + std::string("\"");
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throw std::runtime_error(error.c_str());
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}
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// Create a resource handle for the resource data
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ResourceHandle<T>* resource = new ResourceHandle<T>();
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resource->data = data;
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resource->referenceCount = 1;
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// Add resource to the cache
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resourceCache[path] = resource;
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return resource->data;
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}
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template <typename T>
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void ResourceManager::save(const T* resource, const std::string& path)
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{
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// Attempt to open file
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std::ofstream fs;
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fs.open(path.c_str(), std::ios::out | std::ios::binary);
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// If unable to open file
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if (!fs.is_open() || !fs.good())
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{
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if (fs.is_open())
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{
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fs.close();
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}
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throw std::runtime_error("ResourceManager::save<T>(): Unable to open file \"" + path + "\"");
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}
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try
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{
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ResourceLoader<T>::save(this, &fs, resource);
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}
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catch (const std::exception& e)
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{
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std::string error = std::string("ResourceManager::load<T>(): Failed to save resource \"") + path + std::string("\": \"") + e.what() + std::string("\"");
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throw std::runtime_error(error.c_str());
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}
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}
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#endif // RESOURCE_MANAGER_HPP
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