private static bool Test(GPNode node, GPNodeGatherer filter)
{
if (node == null || filter == null)
{
return(false);
}
// use the GPNodeGatherer if available
return(filter.Test(node));
}
/// <summary>
/// Return this node and its descendants filtered by the GPNodeGatherer.
/// </summary>
public static IEnumerable <GPNode> Descendants(this GPNode node, GPNodeGatherer gatherer)
{
if (node != null)
{
if (Test(node, gatherer))
{
yield return(node);
}
if (node.Children != null)
{
foreach (GPNode child in node.Children.Descendants())
{
if (Test(child, gatherer))
{
yield return(child);
}
}
}
}
}
/// <summary>
/// Enumerates filtered GPNodes in the tree starting with the root (tree.Child).
/// Results are filtered by the GPNodeGatherer which tests each node to decide
/// if it qualifies.
/// </summary>
public static IEnumerable <GPNode> Descendants(this GPTree tree, GPNodeGatherer gatherer)
{
return(Descendants(tree.Child, gatherer));
}
