entity_reference_hierarchy_book_nav-1.0.0/src/Plugin/Block/BookBlockBase.php

<?php

declare(strict_types=1);

namespace Drupal\entity_reference_hierarchy_book_nav\Plugin\Block;

use Drupal\Core\Block\BlockBase;
use Drupal\Core\Cache\Cache;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\entity_reference_hierarchy_book_nav\Book;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a book block base.
 */
abstract class BookBlockBase extends BlockBase implements ContainerFactoryPluginInterface {

  /**
   * Constructs the plugin instance.
   */
  public function __construct(
    array $configuration,
    $plugin_id,
    $plugin_definition,
    protected Book $book,
  ) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition): self {
    return new static(
      $configuration,
      $plugin_id,
      $plugin_definition,
      $container->get('entity_reference_hierarchy_book_nav.book'),
    );
  }

  /**
   * {@inheritdoc}
   */
  public function build(): array {
    $node = $this->getContextValue('node');

    if (!$node) {
      return [];
    }

    $book = $this->book->getBook($node);

    if (!$book) {
      return [];
    }

    return $this->bookBuild($build, $node, $book);
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheContexts() {
    return Cache::mergeContexts(parent::getCacheContexts(), ['url.path', 'languages']);
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheMaxAge() {
    return 1;
  }

  /**
   * Generate the block contents.
   */
  abstract public function bookBuild(&$build, $page, $book);

}