/**
* Try to use the connection that involves the least number of changes.
*
* @param Connection $connection
* @return bool
* @throws PlanningException
*/
protected function thisConnectionIsBetter(Connection $connection)
{
$firstVisit = !isset($this->arrivals[$connection->getDestination()]);
$requiresChange = !isset($this->connections[$connection->getOrigin()]) || $connection->requiresInterchangeWith($this->connections[$connection->getOrigin()]);
$numChanges = $this->changes[$connection->getOrigin()] + intval($requiresChange);
if ($firstVisit || $numChanges < $this->changes[$connection->getDestination()] || $numChanges === $this->changes[$connection->getDestination()] && parent::thisConnectionIsBetter($connection)) {
$this->changes[$connection->getDestination()] = $numChanges;
return true;
}
return false;
}
/**
* @param array $connections
*/
public function __construct(array $connections)
{
if (count($connections) === 0) {
throw new InvalidArgumentException("A leg must be made up of at least one connection.");
}
$this->connections = $connections;
$origin = $connections[0]->getOrigin();
$destination = end($connections)->getDestination();
parent::__construct($origin, $destination);
}
protected function thisConnectionIsBetter(Connection $connection)
{
$noExistingConnection = !isset($this->departures[$connection->getOrigin()]);
if ($connection instanceof NonTimetableConnection) {
return $noExistingConnection || $this->departures[$connection->getOrigin()] < $this->departures[$connection->getDestination()] - $connection->getDuration();
} else {
if ($connection instanceof TimetableConnection) {
return $noExistingConnection || $this->departures[$connection->getOrigin()] < $connection->getDepartureTime();
}
}
throw new PlanningException("Unknown connection type " . get_class($connection));
}
protected function thisConnectionIsBetter(Connection $connection)
{
if (!isset($this->arrivals[$connection->getDestination()])) {
return true;
} else {
if ($connection instanceof NonTimetableConnection) {
return $this->arrivals[$connection->getDestination()] > $this->arrivals[$connection->getOrigin()] + $connection->getDuration();
} else {
if ($connection instanceof TimetableConnection) {
return $this->arrivals[$connection->getDestination()] >= $connection->getArrivalTime();
}
}
}
throw new PlanningException("Unknown connection type " . get_class($connection));
}
