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MenuLink.php in Drupal 8

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core/modules/menu_link_content/src/Plugin/migrate/source/MenuLink.php
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<?php

namespace Drupal\menu_link_content\Plugin\migrate\source;

use Drupal\Component\Utility\Unicode;
use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;
use Drupal\migrate\Row;

/**
 * Drupal menu link source from database.
 *
 * @MigrateSource(
 *   id = "menu_link",
 *   source_module = "menu"
 * )
 */
class MenuLink extends DrupalSqlBase {

  /**
   * {@inheritdoc}
   */
  public function query() {
    $query = $this
      ->select('menu_links', 'ml')
      ->fields('ml');
    $and = $query
      ->andConditionGroup()
      ->condition('ml.module', 'menu')
      ->condition('ml.router_path', [
      'admin/build/menu-customize/%',
      'admin/structure/menu/manage/%',
    ], 'NOT IN');
    $condition = $query
      ->orConditionGroup()
      ->condition('ml.customized', 1)
      ->condition($and);
    $query
      ->condition($condition);
    $query
      ->leftJoin('menu_links', 'pl', 'ml.plid = pl.mlid');
    $query
      ->addField('pl', 'link_path', 'parent_link_path');
    $query
      ->orderBy('ml.depth');
    $query
      ->orderby('ml.mlid');
    return $query;
  }

  /**
   * {@inheritdoc}
   */
  public function fields() {
    return [
      'menu_name' => t("The menu name. All links with the same menu name (such as 'navigation') are part of the same menu."),
      'mlid' => t('The menu link ID (mlid) is the integer primary key.'),
      'plid' => t('The parent link ID (plid) is the mlid of the link above in the hierarchy, or zero if the link is at the top level in its menu.'),
      'link_path' => t('The Drupal path or external path this link points to.'),
      'router_path' => t('For links corresponding to a Drupal path (external = 0), this connects the link to a {menu_router}.path for joins.'),
      'link_title' => t('The text displayed for the link, which may be modified by a title callback stored in {menu_router}.'),
      'options' => t('A serialized array of options to set on the URL, such as a query string or HTML attributes.'),
      'module' => t('The name of the module that generated this link.'),
      'hidden' => t('A flag for whether the link should be rendered in menus. (1 = a disabled menu item that may be shown on admin screens, -1 = a menu callback, 0 = a normal, visible link)'),
      'external' => t('A flag to indicate if the link points to a full URL starting with a protocol, like http:// (1 = external, 0 = internal).'),
      'has_children' => t('Flag indicating whether any links have this link as a parent (1 = children exist, 0 = no children).'),
      'expanded' => t('Flag for whether this link should be rendered as expanded in menus - expanded links always have their child links displayed, instead of only when the link is in the active trail (1 = expanded, 0 = not expanded)'),
      'weight' => t('Link weight among links in the same menu at the same depth.'),
      'depth' => t('The depth relative to the top level. A link with plid == 0 will have depth == 1.'),
      'customized' => t('A flag to indicate that the user has manually created or edited the link (1 = customized, 0 = not customized).'),
      'p1' => t('The first mlid in the materialized path. If N = depth, then pN must equal the mlid. If depth > 1 then p(N-1) must equal the plid. All pX where X > depth must equal zero. The columns p1 .. p9 are also called the parents.'),
      'p2' => t('The second mlid in the materialized path. See p1.'),
      'p3' => t('The third mlid in the materialized path. See p1.'),
      'p4' => t('The fourth mlid in the materialized path. See p1.'),
      'p5' => t('The fifth mlid in the materialized path. See p1.'),
      'p6' => t('The sixth mlid in the materialized path. See p1.'),
      'p7' => t('The seventh mlid in the materialized path. See p1.'),
      'p8' => t('The eighth mlid in the materialized path. See p1.'),
      'p9' => t('The ninth mlid in the materialized path. See p1.'),
      'updated' => t('Flag that indicates that this link was generated during the update from Drupal 5.'),
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function prepareRow(Row $row) {
    $row
      ->setSourceProperty('options', unserialize($row
      ->getSourceProperty('options')));
    $row
      ->setSourceProperty('enabled', !$row
      ->getSourceProperty('hidden'));
    $row
      ->setSourceProperty('description', Unicode::truncate($row
      ->getSourceProperty('options/attributes/title'), 255));
    return parent::prepareRow($row);
  }

  /**
   * {@inheritdoc}
   */
  public function getIds() {
    $ids['mlid']['type'] = 'integer';
    $ids['mlid']['alias'] = 'ml';
    return $ids;
  }

}

Classes

Namesort descending Description
MenuLink Drupal menu link source from database.