RaspberryIO_26/Swan.Tiny/SwanRuntime.cs

using Swan.Logging;
using System;
using System.IO;
using System.Reflection;
using System.Threading;

namespace Swan {
  /// <summary>
  /// Provides utility methods to retrieve information about the current application.
  /// </summary>
  public static class SwanRuntime {
    /*private static readonly Lazy<Assembly> EntryAssemblyLazy = new Lazy<Assembly>(Assembly.GetEntryAssembly);

    private static readonly Lazy<String> CompanyNameLazy = new Lazy<String>(() => {
      AssemblyCompanyAttribute attribute = EntryAssembly.GetCustomAttribute(typeof(AssemblyCompanyAttribute)) as AssemblyCompanyAttribute;
      return attribute?.Company ?? String.Empty;
    });

    private static readonly Lazy<String> ProductNameLazy = new Lazy<String>(() => {
      AssemblyProductAttribute attribute = EntryAssembly.GetCustomAttribute(typeof(AssemblyProductAttribute)) as AssemblyProductAttribute;
      return attribute?.Product ?? String.Empty;
    });

    private static readonly Lazy<String> ProductTrademarkLazy = new Lazy<String>(() => {
      AssemblyTrademarkAttribute attribute = EntryAssembly.GetCustomAttribute(typeof(AssemblyTrademarkAttribute)) as AssemblyTrademarkAttribute;
      return attribute?.Trademark ?? String.Empty;
    });

    private static readonly String ApplicationMutexName = "Global\\{{" + EntryAssembly.FullName + "}}";

    private static readonly Object SyncLock = new Object();*/

    // [Obsolete("NEED", false)]
    private static OperatingSystem? _oS;

    #region Properties
    /// <summary>
    /// Gets the current Operating System.
    /// </summary>
    /// <value>
    /// The os.
    /// </value>
    // [Obsolete("NEED", false)]
    public static OperatingSystem OS {
      get {
        if(_oS.HasValue == false) {
          String windowsDirectory = Environment.GetEnvironmentVariable("windir");
          _oS = String.IsNullOrEmpty(windowsDirectory) == false && windowsDirectory.Contains(@"\") && Directory.Exists(windowsDirectory)
            ? (OperatingSystem?)OperatingSystem.Windows
            : (OperatingSystem?)(File.Exists(@"/proc/sys/kernel/ostype") ? OperatingSystem.Unix : OperatingSystem.Osx);
        }

        return _oS ?? OperatingSystem.Unknown;
      }
    }


    /*/// <summary>
    /// Checks if this application (including version number) is the only instance currently running.
    /// </summary>
    /// <value>
    ///   <c>true</c> if this instance is the only instance; otherwise, <c>false</c>.
    /// </value>
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Codequalität", "IDE0067:Objekte verwerfen, bevor Bereich verloren geht", Justification = "<Ausstehend>")]
    public static Boolean IsTheOnlyInstance {
      get {
        lock(SyncLock) {
          try {
            // Try to open existing mutex.
            _ = Mutex.OpenExisting(ApplicationMutexName);
          } catch {
            try {
              // If exception occurred, there is no such mutex.
              Mutex appMutex = new Mutex(true, ApplicationMutexName);
              $"Application Mutex created {appMutex} named '{ApplicationMutexName}'".Debug(typeof(SwanRuntime));

              // Only one instance.
              return true;
            } catch {
              // Sometimes the user can't create the Global Mutex
            }
          }

          // More than one instance.
          return false;
        }
      }
    }

    /// <summary>
    /// Gets a value indicating whether this application instance is using the MONO runtime.
    /// </summary>
    /// <value>
    ///   <c>true</c> if this instance is using MONO runtime; otherwise, <c>false</c>.
    /// </value>
    public static Boolean IsUsingMonoRuntime => Type.GetType("Mono.Runtime") != null;

    /// <summary>
    /// Gets the assembly that started the application.
    /// </summary>
    /// <value>
    /// The entry assembly.
    /// </value>
    public static Assembly EntryAssembly => EntryAssemblyLazy.Value;

    /// <summary>
    /// Gets the name of the entry assembly.
    /// </summary>
    /// <value>
    /// The name of the entry assembly.
    /// </value>
    public static AssemblyName EntryAssemblyName => EntryAssemblyLazy.Value.GetName();

    /// <summary>
    /// Gets the entry assembly version.
    /// </summary>
    public static Version EntryAssemblyVersion => EntryAssemblyName.Version;

    /// <summary>
    /// Gets the full path to the folder containing the assembly that started the application.
    /// </summary>
    /// <value>
    /// The entry assembly directory.
    /// </value>
    public static String EntryAssemblyDirectory {
      get {
        UriBuilder uri = new UriBuilder(EntryAssembly.CodeBase);
        String path = Uri.UnescapeDataString(uri.Path);
        return Path.GetDirectoryName(path);
      }
    }

    /// <summary>
    /// Gets the name of the company.
    /// </summary>
    /// <value>
    /// The name of the company.
    /// </value>
    public static String CompanyName => CompanyNameLazy.Value;

    /// <summary>
    /// Gets the name of the product.
    /// </summary>
    /// <value>
    /// The name of the product.
    /// </value>
    public static String ProductName => ProductNameLazy.Value;

    /// <summary>
    /// Gets the trademark.
    /// </summary>
    /// <value>
    /// The product trademark.
    /// </value>
    public static String ProductTrademark => ProductTrademarkLazy.Value;

    /// <summary>
    /// Gets a local storage path with a version.
    /// </summary>
    /// <value>
    /// The local storage path.
    /// </value>
    public static String LocalStoragePath {
      get {
        String localAppDataPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), EntryAssemblyName.Name);

        String returnPath = Path.Combine(localAppDataPath, EntryAssemblyVersion.ToString());

        if(!Directory.Exists(returnPath)) {
          _ = Directory.CreateDirectory(returnPath);
        }

        return returnPath;
      }
    }*/

    #endregion

    /*#region Methods

    /// <summary>
    /// Build a full path pointing to the current user's desktop with the given filename.
    /// </summary>
    /// <param name="filename">The filename.</param>
    /// <returns>
    /// The fully qualified location of path, such as "C:\MyFile.txt".
    /// </returns>
    /// <exception cref="ArgumentNullException">filename.</exception>
    public static String GetDesktopFilePath(String filename) {
      if(String.IsNullOrWhiteSpace(filename)) {
        throw new ArgumentNullException(nameof(filename));
      }

      String pathWithFilename = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory), filename);

      return Path.GetFullPath(pathWithFilename);
    }

    #endregion*/
  }
}