AbstractPlaceholderHandler.php

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<?php

declare(strict_types=1);

namespace ILIAS\Mail\Placeholder;

use ilLanguage;
use ILIAS\Mail\Signature\Signature;

abstract class AbstractPlaceholderHandler implements Placeholder
{
    protected ?Placeholder $next = null;

    public function __construct(protected ilLanguage $lng)
    {
    }

    public function getLabel(): string
    {
        return $this->lng->txt('mail_nacc_' . strtolower($this->getId()));
    }

    public function setNext(Placeholder $next): Placeholder
    {
        $this->next = $next;

        return $next;
    }

    public function getNext(): ?Placeholder
    {
        return $this->next;
    }

    public function handle(Signature $signature): array
    {
        $placeholders = [];

        if ($this->next) {
            $placeholders = $this->next->handle($signature);
        }

        if ($signature->supports($this)) {
            $placeholders = $this->addPlaceholder($placeholders);
        }

        return $placeholders;
    }

    abstract public function addPlaceholder(array $placeholder): array;
}