/// <summary>
/// Create a child Navigator of the given parent.
/// </summary>
public Navigator(Navigator parent)
{
ValidateParentIsNonTerminating(parent);
destinationParts = parent.DestinationParts;
destinationPartIndex = parent.DestinationPartIndex + 1;
context = parent.Context.GetImmediateSimulatableRelative(destinationParts[destinationPartIndex]);
}
/// <summary>
/// Get the simulatable relative, immediate or distant, using the given navigator.
/// May return null if the relative is not found.
/// </summary>
public Simulatable GetSimulatableRelative(Navigator navigator)
{
return
navigator.IsTerminating ?
navigator.Context :
navigator.Context.GetSimulatableRelative(new Navigator(navigator));
}
private static void ValidateParentIsNonTerminating(Navigator parent)
{
if (parent.IsTerminating)
throw new ArgumentException("Cannot make a child from a terminating navigator.");
}