private static void CopyPackedValue(PackedTuple source, int sourceIndex, PackedTuple target, int targetIndex)
{
var sourceDescriptor = source.PackedDescriptor.FieldDescriptors[sourceIndex];
var targetDescriptor = target.PackedDescriptor.FieldDescriptors[targetIndex];
var fieldState = source.GetFieldState(sourceDescriptor);
if (!fieldState.IsAvailable())
{
return;
}
if (fieldState.IsAvailableAndNull())
{
target.SetValue(targetIndex, null);
return;
}
var accessor = sourceDescriptor.Accessor;
if (accessor != targetDescriptor.Accessor)
{
throw new InvalidOperationException(string.Format(
Strings.ExInvalidCast,
source.PackedDescriptor[sourceIndex],
target.PackedDescriptor[targetIndex]));
}
target.SetFieldState(targetIndex, TupleFieldState.Available);
accessor.CopyValue(source, sourceDescriptor, target, targetDescriptor);
}
private static void MergeTuplesPreferOriginFast(PackedTuple origin, PackedTuple difference, int startIndex, int length)
{
var bound = startIndex + length;
for (int index = startIndex; index < bound; index++)
{
TupleFieldState fieldState;
if (!origin.GetFieldState(index).IsAvailable())
{
CopyPackedValue(difference, index, origin, index);
}
}
}