Jackalope\Query\QOM\Column::__construct PHP Method

    public function __construct($selectorName, $propertyName, $columnName = null)
    {
        if (null === $selectorName) {
            throw new \InvalidArgumentException('Required argument selectorName may not be null.');
        }
        if ((null === $propertyName) != (null === $columnName)) {
            throw new \InvalidArgumentException('Either both propertyName and columnName must be both null, or both non-null.');
        }
        $this->selectorName = $selectorName;
        $this->propertyName = $propertyName;
        $this->columnName = $columnName;
    }