VoidType.php

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<?php

namespace ILIAS\BackgroundTasks\Types;

class VoidType implements Type
{
    protected static ?\ILIAS\BackgroundTasks\Types\VoidType $instance = null;

    protected function __construct()
    {
    }

    public static function instance(): ?\ILIAS\BackgroundTasks\Types\VoidType
    {
        if (self::instance() === null) {
            self::$instance = new VoidType();
        }

        return self::$instance;
    }

    public function __toString(): string
    {
        return "Void";
    }

    public function isExtensionOf(Type $type): bool
    {
        return $type instanceof VoidType;
    }

    public function equals(Type $otherType): bool
    {
        return $otherType instanceof VoidType;
    }
}