/// <summary>
/// Compares facts by priority facts in parameters.
/// </summary>
/// <param name="x">Fist fact.</param>
/// <param name="y">Second fact.</param>
/// <returns>
/// 1 - <paramref name="x"/> fact is greater than the <paramref name="y"/>,
/// 0 - <paramref name="x"/> fact is equal than the <paramref name="y"/>,
/// -1 - <paramref name="x"/> fact is less than the <paramref name="y"/>.
/// </returns>
public static int CompareByPriorityParameter(this IFact x, IFact y)
{
var xPriority = x.GetParameter(PriorityFactParametersCodes.Priority)?.Value as IPriorityFact;
var yPriority = y.GetParameter(PriorityFactParametersCodes.Priority)?.Value as IPriorityFact;
if (xPriority == null)
{
return(yPriority != null ? -1 : 0);
}
if (yPriority == null)
{
return(1);
}
return(xPriority.CompareTo(yPriority));
}
/// <summary>
/// Compares facts by version facts in parameters.
/// </summary>
/// <param name="x">Fist fact.</param>
/// <param name="y">Second fact.</param>
/// <returns>
/// 1 - <paramref name="x"/> fact is greater than the <paramref name="y"/>,
/// 0 - <paramref name="x"/> fact is equal than the <paramref name="y"/>,
/// -1 - <paramref name="x"/> fact is less than the <paramref name="y"/>.
/// </returns>
public static int CompareByVersionParameter(this IFact x, IFact y)
{
var xVersion = x.GetParameter(VersionedFactParametersCodes.Version)?.Value as IVersionFact;
var yVersion = y.GetParameter(VersionedFactParametersCodes.Version)?.Value as IVersionFact;
if (xVersion == null)
{
return(yVersion == null ? 0 : 1);
}
if (yVersion == null)
{
return(-1);
}
return(xVersion.CompareTo(yVersion));
}