public static DestinationMemberSetter <TContext> CreateConstructingAccessorChain <TContext>(this IEnumerable <MemberInfo> members,
IResourceMapper <TContext> mapper)
{
if (members.Count() < 1)
{
throw new ArgumentException("Collection must have at least one member", "members");
}
var accessors = members.Select(prop => prop.GetAccessor()).ToList();
accessors.Reverse();
DestinationMemberSetter <TContext> setter = null;
foreach (var propertyAccessor in accessors)
{
var accessor = propertyAccessor;
// a = (((b = ((c = (d = 4)))) : Given a, get or create b and set this equal to c...
if (setter == null)
{
setter = (target, value, context) =>
{
accessor.Set(target, value);
return(target);
};
}
else
{
var localSetter = setter;
setter = (target, value, context) =>
{
var destination = accessor.Get(target);
if (destination == null)
{
destination = mapper.ConstructOrThrow(accessor.MemberType);
accessor.Set(target, destination);
}
return(localSetter(destination, value, context));
};
}
}
return(setter);
}