public static RouteElement GetRouteElement(RouteElement previous, string current, string next)
{
// Check Direct
if (Direct.IsValid(current))
{
//Create a new Direct element
return(new Direct());
}
// First element
if (previous == null)
{
//Either SpeedLevel or Airway
if (SpeedLevel.IsValid(current))
{
return(new SpeedLevel(current));
}
// Definitely airway
else
{
return(new Airway(current));
}
}
// Middle element or last element
else
{
// Last element
if (next.Equals(string.Empty))
{
// Either NamedPoint, CoordinatePoint or NavaidPoint or STAR(TO BE IMPLEMENTED)
// TODO: Implement STAR
return(GetSignificantPoint(current));
}
// Middle element
else
{
// Either ChangeOfFlightRule, ChangeOfSpeedLevelPoint, NavaidPoint, CoordinatePoint, NamedPoint or Airway
// Check ChangeOfFlightRule
if (ChangeOfFlightRule.IsValid(current))
{
return(new ChangeOfFlightRule(current));
}
// Check ChangeOfSpeedLevelPoint
else if (ChangeOfSpeedLevelPoint.IsValid(current))
{
string[] currentParts = current.Split('/');
SignificantPoint significantPoint = GetSignificantPoint(currentParts[0]);
SpeedLevel speedLevel = new SpeedLevel(currentParts[1]);
return(new ChangeOfSpeedLevelPoint(significantPoint, speedLevel));
}
// Check CoordinatePoint before checking airway since they can be adjacent
else if (CoordinatePoint.IsValid(current))
{
//Create CoordinatePoint
return(new CoordinatePoint(current));
}
// Either SignificantPoint or Airway
// Find the type of previous element
else if (previous is Airway | previous is SpeedLevel | previous is Direct)
{
// Current is a NamedPoint
return(GetSignificantPoint(current));
}
else
{
// Current is an Airway
return(new Airway(current));
}
}
}
}
