在编辑器插件中管理资源

// Method importing a new asset and waiting for the process to complete (blocking the thread)
void AssetsPlugin::import_new_asset_synchronously()
{
	// calling an auxiliary function to create a new asset and import it, displaying information on imported asset on success, or an error notification
	String result = create_and_import_new_asset_synchronously();
	if (!result.empty())
	{
		success_notification(
			String::format("Asset has imported successfully: \"%s\"", result.get()));

		// set current Editor selection to the imported asset and print information about it
		select_asset(result);

		print_asset_information(result);
	}
	else
	{
		error_notification(String::format("Can't import asset: \"%s\"", result.get()));
	}
}

// Method creating and importing an asset synchronously (blocking the thread until the operation is completed)
String AssetsPlugin::create_and_import_new_asset_synchronously() const
{
	String result;

	// making a base path for a new asset to be imported
	const StringStack<> &base_asset_path = String::joinPaths(DIRECTORY_FOR_NEW_ASSETS,
		String::basename(TEXTURE_PATH));

	// asking  the Asset Manager to generate a unique 
	String new_texture_path = AssetManager::generateUniquePath(base_asset_path);
	if (!create_asset(TEXTURE_PATH, new_texture_path))
	{
		return result;
	}
	// waiting for the texture asset to be imported by the AssetManager and returning the result (new texture path on success of an empty string on failure)
	if (AssetManager::importAssetSync(new_texture_path))
	{
		result = std::move(new_texture_path);
	}

	return result;
}

// Method importing an asset in the background (non-blocking, returns immediately without waiting for operation completion)
void AssetsPlugin::import_new_asset_asynchronously()
{
	// making a base target path for the asset and generating a unique virtual path for it
	const StringStack<> &base_asset_path = String::joinPaths(DIRECTORY_FOR_NEW_ASSETS,
		String::basename(TEXTURE_PATH));
	const String &new_texture_path = AssetManager::generateUniquePath(base_asset_path);
	if (!create_asset(TEXTURE_PATH, new_texture_path))
	{
		return;
	}

	// launching the importing process in the background (asynchronously, without blocking the main thread) and displaying a notification, if it has started successfully
	// to catch completion of the operation set a handler via AssetManager::getEventProcessEnd.connect() method (see method "process_end()" here)
	if (AssetManager::importAssetAsync(new_texture_path))
	{
		success_notification(String::format("Asset import process has started successfully: \"%s\"",
			new_texture_path.get()));
	}
	else
	{
		error_notification(
			String::format("Can't start asset import process: \"%s\"", new_texture_path.get()));
	}
}

// Method removing an asset in the background (non-blocking, returns immediately without waiting for operation completion)
void AssetsPlugin::remove_asset_asynchronously()
{
	// checking whether there are any assets in the source directory to remove (if not, report and return)
	const Vector<String> &asset_paths = AssetManager::getAssetPathsForDirectory(
		DIRECTORY_FOR_NEW_ASSETS);
	if (asset_paths.empty())
	{
		error_notification(String::format("There are no assets to remove: \"%s\"\n",
			DIRECTORY_FOR_NEW_ASSETS));
		return;
	}

	// launching the asset removal process in the background (asynchronously, without blocking the main thread) and displaying a notification, if it has started successfully
	// to catch completion of the operation set a handler via AssetManager::getEventProcessEnd.connect() method (see method "process_end()" here)
	const String &asset_path_to_remove = asset_paths.last();
	if (AssetManager::removeAssetAsync(asset_path_to_remove))
	{
		success_notification(String::format("Asset removal process has started successfully: \"%s\"",
			asset_path_to_remove.get()));
	}
	else
	{
		error_notification(
			String::format("Can't start asset removal process: \"%s\"", asset_path_to_remove.get()));
	}
}

// Method moving an asset to a new location in the background (non-blocking, returns immediately without waiting for operation completion)
void AssetsPlugin::move_asset_asynchronously()
{
	// checking whether there are any assets in the source directory to move (if not, report and return)
	const Vector<String> &asset_paths = AssetManager::getAssetPathsForDirectory(
		DIRECTORY_FOR_NEW_ASSETS);
	if (asset_paths.empty())
	{
		error_notification(String::format("There are no assets to move: \"%s\"\n",
			DIRECTORY_FOR_NEW_ASSETS));
		return;
	}

	// trying to create a destination directory and displaying error notification in case of failure
	if (!AssetManager::createDirectory(DIRECTORY_FOR_MOVED_ASSETS))
	{
		error_notification(
			String::format("Can't create directory: \"%s\"", DIRECTORY_FOR_MOVED_ASSETS));
		return;
	}

	// making a new asset path and generating a unique virtual path for it
	const String &asset_path_to_move = asset_paths.last();
	const StringStack<> &base_asset_path = String::joinPaths(DIRECTORY_FOR_MOVED_ASSETS,
		asset_path_to_move.basename());
	const String &new_asset_path = AssetManager::generateUniquePath(base_asset_path);

	// launching the "move asset" process in the background (asynchronously, without blocking the main thread) and displaying a notification, if it has started successfully
	// to catch completion of the operation set a handler via AssetManager::getEventProcessEnd.connect() method (see method "process_end()" here)
	if (AssetManager::moveAssetAsync(asset_path_to_move, new_asset_path))
	{
		success_notification(
			String::format("Asset moving process has started successfully: from \"%s\" to \"%s\"",
				asset_path_to_move.get(), new_asset_path.get()));
	}
	else
	{
		error_notification(String::format("Can't start asset moving process: from \"%s\" to \"%s\"",
			asset_path_to_move.get(), new_asset_path.get()));
	}
}

// Method renaming an asset asynchronously (non-blocking, returns immediately without waiting for operation completion)
void AssetsPlugin::rename_asset_asynchronously()
{
	// getting paths for all assets in the directory and checking whether it is empty (if so, report and return)
	const Vector<String> &asset_paths = AssetManager::getAssetPathsForDirectory(
		DIRECTORY_FOR_NEW_ASSETS);
	if (asset_paths.empty())
	{
		error_notification(String::format("There are no assets to rename: \"%s\"\n",
			DIRECTORY_FOR_NEW_ASSETS));
		return;
	}

	// as an example, we rename the last file
	const String &asset_path_to_rename = asset_paths.last();

	const StringStack<> &new_asset_dir_path = String::dirname(asset_path_to_rename);
	const char *NEW_ASSET_FILE_NAME = "Renamed Asset";

	// making a new asset path and generating a unique virtual path for it
	StringStack<> new_asset_path = String::joinPaths(new_asset_dir_path, NEW_ASSET_FILE_NAME);
	new_asset_path += '.' + String::extension(asset_path_to_rename);

	new_asset_path = AssetManager::generateUniquePath(new_asset_path);

	// getting a base name for it to set while renaming
	const StringStack<> &new_asset_name = new_asset_path.basename();

	// putting a new "asset rename" task to a queue and displaying the corresponding notification depending on the result
	if (AssetManager::renameAssetAsync(asset_path_to_rename, new_asset_name))
	{
		success_notification(
			String::format("Asset renaming process has started successfully: from \"%s\" to \"%s\"",
				asset_path_to_rename.get(), new_asset_path.get()));
	}
	else
	{
		error_notification(String::format("Can't start asset renaming process: from \"%s\" to \"%s\"",
			asset_path_to_rename.get(), new_asset_path.get()));
	}
}

// Method copying an asset asynchronously (non-blocking, returns immediately without waiting for operation completion)
void AssetsPlugin::copy_asset_asynchronously()
{
	// getting paths for all assets in the directory and checking whether it is empty (if so, report and return)
	const Vector<String> &asset_paths = AssetManager::getAssetPathsForDirectory(
		DIRECTORY_FOR_NEW_ASSETS);
	if (asset_paths.empty())
	{
		error_notification(String::format("There are no assets to copy: \"%s\"\n",
			DIRECTORY_FOR_NEW_ASSETS));
		return;
	}

	// as an example, we copy the last file
	const String &asset_path_to_copy = asset_paths.last();

	// creating a new directory
	if (!AssetManager::createDirectory(DIRECTORY_FOR_COPIED_ASSETS))
	{
		error_notification(
			String::format("Can't create directory: \"%s\"", DIRECTORY_FOR_COPIED_ASSETS));
		return;
	}

	// making a base path and generating a unique virtual path for a new copy of the asset
	const StringStack<> &base_asset_path = String::joinPaths(DIRECTORY_FOR_COPIED_ASSETS,
		asset_path_to_copy.basename());
	const String &new_asset_path = AssetManager::generateUniquePath(base_asset_path);

	// putting a new "asset copy" task to a queue and displaying the corresponding notification depending on the result
	if (AssetManager::copyAssetAsync(asset_path_to_copy, new_asset_path))
	{
		success_notification(
			String::format("Asset copying process has started successfully: from \"%s\" to \"%s\"",
				asset_path_to_copy.get(), new_asset_path.get()));
	}
	else
	{
		error_notification(String::format("Can't start asset copying process: from \"%s\" to \"%s\"",
			asset_path_to_copy.get(), new_asset_path.get()));
	}
}

// Method printing out the list of paths and GUIDs for all assets in the root project directory (including all subdirectories)
void AssetsPlugin::print_all_known_assets()
{
	Log::message("[Assets Plugin] All asset paths:\n");
	for (const String &path : AssetManager::getAssetPaths())
	{
		Log::message("\t%s\n", path.get());
	}
	Log::message("\n[Assets Plugin] All asset GUIDs:\n");
	for (const UGUID &guid : AssetManager::getAssetGUIDs())
	{
		Log::message("\t%s\n", guid.getFileSystemString());
	}
	Log::message("\n");
}

// Method printing out general information for the specified asset path
void AssetsPlugin::print_asset_information(const char *asset_path)
{
	const UGUID &asset_guid = AssetManager::getAssetGUIDFromPath(asset_path);
	// It's only to demonstrate the usage of some API functions:
	Log::message("[Assets Plugin] Asset information:\n");
	Log::message("\tVirtual path: %s\n", AssetManager::getAssetPathFromGUID(asset_guid).get());
	Log::message("\tFile GUID: %s\n", asset_guid.getFileSystemString());
	Log::message("\tAccess: %s\n",
		AssetManager::isAssetWritable(asset_path) ? "read & write" : "read-only");
	auto get_import_parameters_as_string = [asset_path] {
		const CollectionPtr &parameters = AssetManager::getAssetImportParameters(asset_path);
		return convert_vector_to_flat_string(parameters->getNames());
	};
	Log::message("\tImport parameter names: %s\n", get_import_parameters_as_string().get());
 
	// getting the list of GUIDs for all runtimes generated for the asset path and displaying general information about them (if any)
	const Vector<UGUID> &runtime_guids = AssetManager::getRuntimeGUIDs(asset_path);
	if (runtime_guids.empty())
	{
		Log::message("\tNo runtimes\n");
	}
	else
	{
		Log::message("\tRuntimes:\n");
		for (int i = 0, count = runtime_guids.size(); i < count; ++i)
		{
			const UGUID &rt_guid = runtime_guids[i];
			Log::message("\t\tRuntime #%d is %s: Alias (%s) File GUID (%s)\n", i,
				AssetManager::isRuntimePrimary(rt_guid) ? "primary" : "non-primary",
				AssetManager::getRuntimeAlias(rt_guid).get(), rt_guid.getFileSystemString());
		}
	}
}

// Method creating a new directory
void AssetsPlugin::create_directory()
{
	// making a base path for a new directory and generating a unique virtual path for it
	const StringStack<> &base_path = String::joinPaths(DIRECTORY_FOR_NEW_DIRECTORIES,
		"New Directory");
	const String &new_path = AssetManager::generateUniquePath(base_path);

	// creating a new directory for the specified path and displaying the corresponding notification
	if (AssetManager::createDirectory(new_path))
	{
		success_notification(
			String::format("Directory has been created successfully: \"%s\"", new_path.get()));
		assert(AssetManager::isDirectoryWritable(new_path));
	}
	else
	{
		error_notification(String::format("Can't create directory: \"%s\"", new_path.get()));
	}
}

// Method removing a directory with assets (non-blocking, returns immediately without waiting for operation completion)
void AssetsPlugin::remove_directory_with_copied_assets_asynchronously()
{
	// checking if the specified directory exists (if not, report and return)
	if (!AssetManager::isDirectory(DIRECTORY_FOR_COPIED_ASSETS))
	{
		error_notification(
			String::format("Directory doesn't exist: \"%s\"", DIRECTORY_FOR_COPIED_ASSETS));
		return;
	}

	// putting a new "remove directory" task to a queue and displaying the corresponding notification depending on the result
	if (AssetManager::removeDirectoryAsync(DIRECTORY_FOR_COPIED_ASSETS))
	{
		success_notification(String::format("Directory removal process has started successfully: \"%s\"",
			DIRECTORY_FOR_COPIED_ASSETS));
	}
	else
	{
		error_notification(
			String::format("Can't start directory removal process: \"%s\"", DIRECTORY_FOR_COPIED_ASSETS));
	}
}

// Method moving a directory with assets to a new location (non-blocking, returns immediately without waiting for operation completion)
void AssetsPlugin::move_directory_with_copied_assets_asynchronously()
{
	// checking if the source directory exists (if not, report and return)
	if (!AssetManager::isDirectory(DIRECTORY_FOR_COPIED_ASSETS))
	{
		error_notification(
			String::format("Directory doesn't exist: \"%s\"", DIRECTORY_FOR_COPIED_ASSETS));
		return;
	}

	// making a base destination path and generating a unique virtual path for it
	const StringStack<> &base_path = String::joinPaths(DIRECTORY_FOR_NEW_DIRECTORIES,
		"New Directory");
	const String &new_path = AssetManager::generateUniquePath(base_path);

	// putting a new "move directory" task to a queue and displaying the corresponding notification depending on the result
	if (AssetManager::moveDirectoryAsync(DIRECTORY_FOR_COPIED_ASSETS, new_path))
	{
		success_notification(
			String::format("Directory moving process has started successfully: from \"%s\" to \"%s\"",
				DIRECTORY_FOR_COPIED_ASSETS, new_path.get()));
	}
	else
	{
		error_notification(String::format("Can't start directory moving process:  from \"%s\" to \"%s\"",
			DIRECTORY_FOR_COPIED_ASSETS, new_path.get()));
	}
}

// Method renaming a directory with assets (non-blocking, returns immediately without waiting for operation completion)
void AssetsPlugin::rename_directory_with_copied_assets_asynchronously()
{
	// checking if the specified directory exists (if not, report and return)
	if (!AssetManager::isDirectory(DIRECTORY_FOR_COPIED_ASSETS))
	{
		error_notification(
			String::format("Directory doesn't exist: \"%s\"", DIRECTORY_FOR_COPIED_ASSETS));
		return;
	}

	// generating a unique virtual path for the destination directory and getting its base name to change it
	const String &new_path = AssetManager::generateUniquePath(DIRECTORY_FOR_COPIED_ASSETS);
	const StringStack<> &new_name = new_path.basename();

	// putting a new "rename directory" task to a queue and displaying the corresponding notification depending on the result
	if (AssetManager::renameDirectoryAsync(DIRECTORY_FOR_COPIED_ASSETS, new_name))
	{
		success_notification(
			String::format("Directory renaming process has started successfully: from \"%s\" to \"%s\"",
				DIRECTORY_FOR_COPIED_ASSETS, new_path.get()));
	}
	else
	{
		error_notification(String::format("Can't start directory renaming process: from \"%s\" to \"%s\"",
			DIRECTORY_FOR_COPIED_ASSETS, new_path.get()));
	}
}

// Method copying a directory with assets to the specified path (non-blocking, returns immediately without waiting for operation completion)
void AssetsPlugin::copy_directory_with_copied_assets_asynchronously()
{
	// checking if the specified directory exists (if not, report and return)
	if (!AssetManager::isDirectory(DIRECTORY_FOR_COPIED_ASSETS))
	{
		error_notification(
			String::format("Directory doesn't exist: \"%s\"", DIRECTORY_FOR_COPIED_ASSETS));
		return;
	}

	// making the destination base path, to which the directory is to be copied, and generating a new unique virtual path for it
	const StringStack<> &base_path = String::joinPaths(DIRECTORY_FOR_NEW_DIRECTORIES,
		"New Directory");
	const String &new_path = AssetManager::generateUniquePath(base_path);

	// launching the copying process in the background (asynchronously, without blocking the main thread) and displaying a notification, if it has started successfully
	// to catch completion of the operation set a handler via AssetManager::getEventProcessEnd.connect() method (see method "process_end()" here)
	if (AssetManager::copyDirectoryAsync(DIRECTORY_FOR_COPIED_ASSETS, new_path))
	{
		success_notification(
			String::format("Directory copying process has started successfully: from \"%s\" to \"%s\"",
				DIRECTORY_FOR_COPIED_ASSETS, new_path.get()));
	}
	else
	{
		error_notification(String::format("Can't start directory copying process: from \"%s\" to \"%s\"",
			DIRECTORY_FOR_COPIED_ASSETS, new_path.get()));
	}
}

// Method listing all directories known to the AssetManager
void AssetsPlugin::print_all_known_directories()
{
	Log::message("\n[Assets Plugin] All directory paths:\n");
	for (const String &path : AssetManager::getDirectoryPathsAll())
	{
		Log::message("\t%s\n", path.get());
	}
	Log::message("\n");
}

// Method listing all subdirectories of the specified path, that are known to the AssetManager
void AssetsPlugin::print_directories_from_test_directory()
{
	Log::message("\n[Assets Plugin] Directory paths from \"%s\":\n", DIRECTORY_FOR_NEW_DIRECTORIES);
	for (const String &path : AssetManager::getDirectoryPaths(DIRECTORY_FOR_NEW_DIRECTORIES))
	{
		Log::message("\t%s\n", path.get());
	}
	Log::message("\n");
}

// Method creating a new mount point
void AssetsPlugin::create_mount_point()
{
	// checking if a path for a mount point to be created already exists and displaying the corresponding notifications
	if (AssetManager::isExist(DIRECTORY_FOR_MOUNT_POINT))
	{
		if (AssetManager::isAsset(DIRECTORY_FOR_MOUNT_POINT))
		{
			error_notification(
				String::format("Target path already contains a known asset: \"%s\"", DIRECTORY_FOR_MOUNT_POINT));
		}
		else if (AssetManager::isMountPoint(DIRECTORY_FOR_MOUNT_POINT))
		{
			assert(AssetManager::isDirectory(DIRECTORY_FOR_MOUNT_POINT));	// Mount point is a directory
			success_notification(
				String::format("Mount point for the target path already exists: \"%s\"", DIRECTORY_FOR_MOUNT_POINT));
		}
		else if (AssetManager::isDirectory(DIRECTORY_FOR_MOUNT_POINT))
		{
			error_notification(
				String::format("Target path already contains a known directory: \"%s\"", DIRECTORY_FOR_MOUNT_POINT));
		}
		else
		{
			// May be some reserved file or directory already exists there
			error_notification(
				String::format("Target path already exists and may contain a reserved file or some directory: \"%s\"", DIRECTORY_FOR_MOUNT_POINT));
		}
		return;
	}

	// making an absolute path to the mount
	StringStack<> abs_dir_path = String::normalizeDirPath(Engine::get()->getDataPath());
	abs_dir_path = abs_dir_path.trimLast("/");
	abs_dir_path = abs_dir_path.dirname();
	abs_dir_path = String::joinPaths(abs_dir_path, MOUNT_POINT_DIRECTORY_NAME);

	// getting an existing directory for the absolute path or creating it
	if (!Dir::mkdir(abs_dir_path))
	{
		error_notification(String::format("Can't create directory \"%s\"", abs_dir_path.get()));
		return;
	}

	// creating an instance of the MountPointParameters class to specify necessary settings for a new mount point to be created (path and access mode) 
	MountPointParametersPtr mount_params = MountPointParameters::create();
	mount_params->setAbsolutePath(abs_dir_path);
	mount_params->setAccess(MountPointParameters::ACCESS_READWRITE);

	// trying to create a new mount point for the specified path and parameters, displaying a notification depending on the result
	if (AssetManager::createMountPoint(DIRECTORY_FOR_MOUNT_POINT, mount_params))
	{
		success_notification(String::format("Mount point has been created successfully: \"%s\"",
			DIRECTORY_FOR_MOUNT_POINT));
		assert(AssetManager::isMountPoint(DIRECTORY_FOR_MOUNT_POINT));
	}
	else
	{
		error_notification(
			String::format("Can't create mount point: \"%s\"", DIRECTORY_FOR_MOUNT_POINT));
	}
}