/// <summary>
/// Loads version information from the specified state reader and asserts that the version name tag matches with the specified versioned artifact's.
/// </summary>
/// <param name="reader">Reader to read version state from.</param>
/// <param name="versioned">Version artifact whose version name tag to compart to the version information read from the reader.</param>
/// <returns>The version number read from the state reader.</returns>
/// <exception cref="InvalidOperationException">Thrown if the state reader read a version name tag that doesn't match the name tag in the specified version artifact.</exception>
public static Version LoadVersionInfo(this IOperatorStateReader reader, IVersioned versioned)
{
// The call to TryRead will only ever return false if the operator is transitioning.
// Otherwise, the constructor call for the reader would have thrown.
if (!reader.TryRead <string>(out string name) || (versioned is ITransitioningOperator && versioned.Name != name))
{
return(null);
}
if (versioned.Name != name)
{
throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, "Failed to restore state for artifact '{0}' with expected tag '{1}'. State tag is '{2}'.", versioned.ToString(), versioned.Name, name));
}
var major = reader.Read <int>();
var minor = reader.Read <int>();
var build = reader.Read <int>();
var revision = reader.Read <int>();
return(Versioning.GetVersion(major, minor, build, revision));
}
