/// <summary>
/// decorates with polyfacingness if it's not already there
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="condition"></param>
/// <param name="rootFace"></param>
/// <returns></returns>
public static PolyfacingConditionDecoration <Tface> Polyfacing <Tface>(this ICondition decorated, Polyface rootFace = null)
where Tface : ICondition
{
Condition.Requires(decorated).IsNotNull();
PolyfacingConditionDecoration <Tface> rv = null;
/*Summary:
* if we spec a root we are setting that root
* if the condition is already polyfacing we use that otherwise build new one
* if no root is spec'd we create new polyface
*/
//if we have polyface in our chain, we return that
if (decorated.HasDecoration <PolyfacingConditionDecoration <Tface> >())
{
rv = decorated.As <PolyfacingConditionDecoration <Tface> >();
}
else
{
rv = new PolyfacingConditionDecoration <Tface>(decorated, rootFace);
}
return(rv);
}