/// <summary>
/// Returns a collection of the siblings after specified object.
/// </summary>
/// <param name="service"></param>
/// <param name="o"></param>
/// <returns></returns>
public static IEnumerable <T> GetObjectsAfterSelf <T>(this IHierarchyService <T> service, T o) where T : class
{
ThrowIfInvalidArgs(service, o);
var parent = service.GetParent(o);
if (parent != null)
{
return(service.GetChildren(parent).SkipWhile(c => c != o).Skip(1));
}
return(Enumerable.Empty <T>());
}
/// <summary>
/// Returns a collection of ancestors of specified object.
/// </summary>
/// <param name="service"></param>
/// <param name="o"></param>
/// <returns></returns>
public static IEnumerable <T> GetAncestors <T>(this IHierarchyService <T> service, T o)
{
ThrowIfInvalidArgs(service, o);
while (true)
{
o = service.GetParent(o);
if (o != null)
{
yield return(o);
}
else
{
break;
}
}
}
/// <summary>
/// Determines whether specified object is the root object.
/// </summary>
/// <param name="service"></param>
/// <param name="o"></param>
/// <returns></returns>
public static bool IsRoot <T>(this IHierarchyService <T> service, T o)
{
ThrowIfInvalidArgs(service, o);
return(service.GetParent(o) == null);
}