XAxis.php

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<?php

declare(strict_types=1);

namespace ILIAS\UI\Component\Chart\Bar;

class XAxis extends Axis
{
    protected const ALLOWED_POSITIONS = ["bottom", "top"];

    protected string $abbreviation = "x";
    protected string $position = "bottom";

    public function getAbbreviation(): string
    {
        return $this->abbreviation;
    }

    public function withPosition(string $position): self
    {
        if (!in_array($position, self::ALLOWED_POSITIONS)) {
            throw new \InvalidArgumentException(
                "Position must be 'bottom' or 'top'."
            );
        }
        $clone = clone $this;
        $clone->position = $position;
        return $clone;
    }

    public function getPosition(): string
    {
        return $this->position;
    }
}