private static bool Equal <T>(FacetValues leftValues, FacetValues rightValues, string facetName)
{
var description = FacetDescriptionHelpers.GetFacetDescription <T>(facetName);
Facet leftFacet = null;
var leftHasValue = leftValues.TryGetFacet(description, out leftFacet);
Facet rightFacet = null;
var rightHasValue = rightValues.TryGetFacet(description, out rightFacet);
return((leftHasValue && rightHasValue &&
EqualityComparer <T> .Default.Equals((T)leftFacet.Value, (T)rightFacet.Value)) ||
(!leftHasValue && !rightHasValue));
}
private static IEnumerable <Facet> OverrideFacetValues <T>(
IEnumerable <T> facetThings,
Func <T, FacetDescription> getDescription,
Func <T, Facet> getFacet,
FacetValues values)
{
foreach (T facetThing in facetThings)
{
FacetDescription description = getDescription(facetThing);
Facet facet;
if (!description.IsConstant && values.TryGetFacet(description, out facet))
{
yield return(facet);
}
else
{
yield return(getFacet(facetThing));
}
}
}