HierarchyIsChildOfEntity.php in Entity Reference Hierarchy 3.x

Namespace

Drupal\entity_hierarchy\Plugin\views\argument

File

src/Plugin/views/argument/HierarchyIsChildOfEntity.php

<?php

namespace Drupal\entity_hierarchy\Plugin\views\argument;


/**
 * Argument to limit to children of an entity.
 *
 * @ingroup views_argument_handlers
 *
 * @ViewsArgument("entity_hierarchy_argument_is_child_of_entity")
 */
class HierarchyIsChildOfEntity extends EntityHierarchyArgumentPluginBase {

  /**
   * Set up the query for this argument.
   *
   * The argument sent may be found at $this->argument.
   */
  public function query($group_by = FALSE) {
    $this
      ->ensureMyTable();

    // Load the actual entity.
    $filtered = FALSE;
    if ($entity = $this
      ->loadEntity()) {
      $stub = $this->nodeKeyFactory
        ->fromEntity($entity);
      if ($node = $this
        ->getTreeStorage()
        ->getNode($stub)) {

        // Query between a range.
        $filtered = TRUE;
        $lower_token = ':lower_' . $this->tableAlias;
        $upper_token = ':upper_' . $this->tableAlias;
        $expression = "{$this->tableAlias}.{$this->realField} BETWEEN {$lower_token} and {$upper_token} AND {$this->tableAlias}.{$this->realField} <> {$lower_token}";
        $arguments = [
          $lower_token => $node
            ->getLeft(),
          $upper_token => $node
            ->getRight(),
        ];
        if ($depth = $this->options['depth']) {
          $depth_token = ':depth_' . $this->tableAlias;
          $expression .= " AND {$this->tableAlias}.depth <= {$depth_token}";
          $arguments[$depth_token] = $node
            ->getDepth() + $depth;
        }
        $this->query
          ->addWhereExpression(0, $expression, $arguments);
      }
    }

    // The parent entity doesn't exist, or isn't in the tree and hence has no
    // children.
    if (!$filtered) {

      // Add a killswitch.
      $this->query
        ->addWhereExpression(0, '1 <> 1');
    }
  }

}

Classes

Name	Description
HierarchyIsChildOfEntity	Argument to limit to children of an entity.