/**
* Returns the zone at the index $index.
*
* @param int $index
*
* @return \StdClass|null
*
* @throws InvalidArgumentException
*/
public function getZone($index)
{
if (false === Numeric::isPositiveInteger($index, false)) {
throw new InvalidArgumentException('Invalid integer value.');
}
if (null !== ($zones = $this->getZones())) {
if ($index < count($zones)) {
return $zones[$index];
}
}
return;
}
/**
* Sets the position.
* @param integer $position
*
* @return Page
*
* @throws InvalidArgumentException Raises if the value can not be cast to positive integer.
*/
public function setPosition($position)
{
if (false === Numeric::isPositiveInteger($position, false)) {
throw new InvalidArgumentException('A position must be a positive integer.');
}
$this->_position = $position;
return $this;
}
/**
* Sets the level.
*
* @param type $level
* @return \BackBee\CoreDomain\NestedNode\AbstractNestedNode
* @throws \BackBee\Exception\InvalidArgumentException Occurs if the value can not be cast to positive integer
*/
public function setLevel($level)
{
if (false === Numeric::isPositiveInteger($level, false)) {
throw new InvalidArgumentException('A nested level must be a positive integer.');
}
$this->_level = $level;
return $this;
}
