LayoutTempstoreParamConverter.php

<?php

namespace Drupal\layout_builder\Routing;

use Drupal\Core\ParamConverter\ParamConverterInterface;
use Drupal\layout_builder\LayoutTempstoreRepositoryInterface;
use Drupal\layout_builder\SectionStorage\SectionStorageManagerInterface;
use Symfony\Component\Routing\Route;

/**
 * Loads the section storage from the layout tempstore.
 *
 * @internal
 *   Tagged services are internal.
 */
class LayoutTempstoreParamConverter implements ParamConverterInterface {
    
    /**
     * The layout tempstore repository.
     *
     * @var \Drupal\layout_builder\LayoutTempstoreRepositoryInterface
     */
    protected $layoutTempstoreRepository;
    
    /**
     * The section storage manager.
     *
     * @var \Drupal\layout_builder\SectionStorage\SectionStorageManagerInterface
     */
    protected $sectionStorageManager;
    
    /**
     * Constructs a new LayoutTempstoreParamConverter.
     *
     * @param \Drupal\layout_builder\LayoutTempstoreRepositoryInterface $layout_tempstore_repository
     *   The layout tempstore repository.
     * @param \Drupal\layout_builder\SectionStorage\SectionStorageManagerInterface $section_storage_manager
     *   The section storage manager.
     */
    public function __construct(LayoutTempstoreRepositoryInterface $layout_tempstore_repository, SectionStorageManagerInterface $section_storage_manager) {
        $this->layoutTempstoreRepository = $layout_tempstore_repository;
        $this->sectionStorageManager = $section_storage_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public function convert($value, $definition, $name, array $defaults) {
        // If no section storage type is specified or if it is invalid, return.
        if (!isset($defaults['section_storage_type']) || !$this->sectionStorageManager
            ->hasDefinition($defaults['section_storage_type'])) {
            return NULL;
        }
        $type = $defaults['section_storage_type'];
        // Load an empty instance and derive the available contexts.
        $contexts = $this->sectionStorageManager
            ->loadEmpty($type)
            ->deriveContextsFromRoute($value, $definition, $name, $defaults);
        // Attempt to load a full instance based on the context.
        if ($section_storage = $this->sectionStorageManager
            ->load($type, $contexts)) {
            // Pass the plugin through the tempstore repository.
            return $this->layoutTempstoreRepository
                ->get($section_storage);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function applies($definition, $name, Route $route) {
        return !empty($definition['layout_builder_tempstore']);
    }

}