ListGroup.php

<?php

namespace Drupal\basf_twig\BridgeElements\Atom;

use Drupal\basf_twig\BridgeElements\ElementInterface;
use Drupal\paragraphs\ParagraphInterface;

class ListGroup implements ElementInterface {

  /**
   * Feature list Icon.
   *
   * @var \Drupal\basf_twig\BridgeElements\Atom\Icon|null
   */
  private ?Icon $icon = NULL;

  /**
   * Items of List Group.
   *
   * @var array
   */
  private array $items = [];

  /**
   * List Group background.
   *
   * @var bool
   */
  private bool $background = FALSE;

  /**
   * Constructs the Atom "List Group" object.
   */
  private function __construct(
    array $options = NULL,
  ) {
    // Copy all options to the object.
    foreach ($options as $option => $optionValue) {
      if (property_exists($this, $option)) {
        $this->$option = $optionValue;
      }
    }
  }

  /**
   * Creates List Group object.
   *
   * @param \Drupal\paragraphs\ParagraphInterface $paragraph
   *   List Group Paragraph.
   *
   * @return static
   *   List Group object.
   * @throws \Exception
   */
  public static function create(ParagraphInterface $paragraph): ListGroup {
    $options = [];

    if (!$paragraph->field_list_items->isEmpty()) {
      $options['items'] = ListItem::createFromField($paragraph->field_list_items);
    }

    return new self($options);
  }

  /**
   * {@inheritdoc}
   */
  public function toArray(): array {
    return array_filter([
      'icon' => $this->icon,
      'items' => $this->getListItem(),
      'background' => $this->background,
    ]);
  }

  /**
   * Set or delete icon for the List Group.
   *
   * @param \Drupal\basf_twig\BridgeElements\Atom\Icon|null $icon
   *  List Group icon.
   *
   * @return ListGroup
   *   List Group object.
   */
  public function setIcon(?Icon $icon): ListGroup {
    $this->icon = $icon;

    return $this;
  }

  /**
   * Provides list Items for the entity.
   *
   * @return array
   *   list Items or empty array if no list Items here.
   */
  private function getListItem(): array {
    return $this->items;
  }

}