GetProbe.php

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<?php

declare(strict_types=1);

namespace ILIAS\Component\Dependencies;

use ILIAS\Component\Component;

class GetProbe implements \ArrayAccess
{
    public function __construct(
        protected $probe
    ) {
        if (!is_callable($probe)) {
            throw new \InvalidArgumentException(
                "Expected \$probe to be callable."
            );
        }
    }

    public function offsetExists($offset): bool
    {
        return false;
    }

    public function offsetGet($offset): mixed
    {
        $probe = $this->probe;
        return $probe($offset);
    }

    public function offsetSet($offset, $value): void
    {
        throw new \LogicException(
            "Read-only dependency type used for writing."
        );
    }

    public function offsetUnset($offset): void
    {
    }
}