/// <summary>
/// Identifies the current platform, and returns a PlatformIdentifier that describes the current platform.
/// </summary>
/// <returns>A PlatformIdentifier that represents the current platform.</returns>
public static PlatformIdentifier GetPlatformIdentifier()
{
if (_cache != null)
{
return(_cache);
}
var ret = new PlatformIdentifier();
if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
{
ret.PlatformCodes.Add("linux");
ret.PlatformCodes.Add("unix");
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
{
ret.PlatformCodes.Add("osx");
ret.PlatformCodes.Add("unix");
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
ret.PlatformCodes.Add("windows");
}
ret.PlatformCodes.Add("generic");
return(_cache = ret);
}
/// <summary>
/// Constructs an instance of the platform-specific class that implements T interface with the given parameters.
/// </summary>
/// <typeparam name="T">An interface that has multiple platform-specific implementations.</typeparam>
/// <param name="id">The platform identifier to use when looking for the implementation.</param>
/// <param name="constructor_params">The set of parameters to be passed to the constructor.</param>
/// <returns>A new instance of a class that implements T and matches the provided platform identifier.</returns>
public static T GetImplementation <T>(PlatformIdentifier id, params object[] constructor_params)
{
var T_type = typeof(T);
if (!TypesPerInterface.ContainsKey(T_type))
{
throw new ArgumentException();
}
var types = TypesPerInterface[T_type];
// the platform codes are ordered from most specific to least specific
foreach (var platform in id.PlatformCodes)
{
foreach (var type in types)
{
if (PlatformsPerType[type].Contains(platform))
{
return((T)Activator.CreateInstance(type, constructor_params));
}
}
}
throw new Exception();
}
/// <summary>
/// Constructs instances of all the platform-specific classes permitted by the current platform that implement interface T with the given parameters.
/// </summary>
/// <typeparam name="T">An interface that has multiple platform-specific implementations.</typeparam>
/// <param name="constructor_params">The set of parameters to be passed to the constructor.</param>
/// <returns>A new instance of a class that implements T and matches the current platform identifier.</returns>
public static T GetImplementation <T>(params object[] constructor_params)
{
return(GetImplementation <T>(PlatformIdentifier.GetPlatformIdentifier(), constructor_params));
}
public static T GetImplementation <T>(PlatformIdentifier id, params object[] constructor_params) => GetImplementations <T>(id, constructor_params).FirstOrDefault();
