public static int Compare(IGroup x, IGroup y, IComparer comp)
{
if (x == null)
{
return((y == null) ? 0 : -1);
}
if (y == null)
{
return(1);
}
if (x == y)
{
return(0);
}
IGroup ox = TopGroup(x, out int xLevel), oy = TopGroup(y, out int yLevel);
if (ox == oy)
{
ox = x; oy = y;
int oxLevel = xLevel, oyLevel = yLevel;
while (ox.Group != oy.Group)
{
if (oxLevel > oyLevel)
{
ox = ox.Group;
oxLevel--;
}
else if (oxLevel < oyLevel)
{
oy = oy.Group;
oyLevel--;
}
else
{
ox = ox.Group; oy = oy.Group;
oxLevel--; oyLevel--;
}
}
if (ox == oy)
{
return(xLevel.CompareTo(yLevel));
}
}
return(ListHelper.Compare(ox, oy, comp, true));
}
public static int CompareKey(IInvoker accesor, object x, object key, IComparer comparer)
{
return(ListHelper.Compare(accesor.GetValue(x), key, comparer, false));
}