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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Extensions.Data
* File: BlobExtensions.cs
*
* BlobExtensions.cs is part of VNLib.Plugins.Extensions.Data which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Extensions.Data is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation, either version 2 of the License,
* or (at your option) any later version.
*
* VNLib.Plugins.Extensions.Data 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with VNLib.Plugins.Extensions.Data. If not, see http://www.gnu.org/licenses/.
*/
using System;
using VNLib.Utils;
namespace VNLib.Plugins.Extensions.Data.Storage
{
public static class BlobExtensions
{
public const string USER_ID_ENTRY = "__.uid";
public const string VERSION_ENTRY = "__.vers";
private const string FILE_SIZE = "__.size";
private const string FILE_NAME = "__.name";
private const string ERROR_FLAG = "__.err";
public static string GetUserId(this Blob blob) => blob[USER_ID_ENTRY];
/// <summary>
/// Gets the <see cref="Version"/> stored in the current <see cref="Blob"/>
/// </summary>
/// <returns>The sored version if previously set, thows otherwise</returns>
/// <exception cref="FormatException"></exception>
public static Version GetVersion(this Blob blob) => Version.Parse(blob[VERSION_ENTRY]);
/// <summary>
/// Sets a <see cref="Version"/> for the current <see cref="Blob"/>
/// </summary>
/// <param name="blob"></param>
/// <param name="version">The <see cref="Version"/> of the <see cref="Blob"/></param>
public static void SetVersion(this Blob blob, Version version) => blob[VERSION_ENTRY] = version.ToString();
/// <summary>
/// Gets a value indicating if the last operation left the <see cref="Blob"/> in an undefined state
/// </summary>
/// <returns>True if the <see cref="Blob"/> state is undefined, false otherwise</returns>
public static bool IsError(this Blob blob) => bool.TrueString.Equals(blob[ERROR_FLAG]);
internal static void IsError(this LWStorageDescriptor blob, bool value) => blob[ERROR_FLAG] = value ? bool.TrueString : null;
internal static long GetLength(this LWStorageDescriptor blob) => (blob as IObjectStorage).GetObject<long>(FILE_SIZE);
internal static void SetLength(this LWStorageDescriptor blob, long length) => (blob as IObjectStorage).SetObject(FILE_SIZE, length);
internal static string GetName(this LWStorageDescriptor blob) => blob[FILE_NAME];
internal static string SetName(this LWStorageDescriptor blob, string filename) => blob[FILE_NAME] = filename;
}
}
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