Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/taxonomy/src/Entity/Vocabulary.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\taxonomy\Entity\Vocabulary.
+ */
+
+namespace Drupal\taxonomy\Entity;
+
+use Drupal\Core\Config\Entity\ConfigEntityBundleBase;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\taxonomy\VocabularyInterface;
+
+/**
+ * Defines the taxonomy vocabulary entity.
+ *
+ * @ConfigEntityType(
+ *   id = "taxonomy_vocabulary",
+ *   label = @Translation("Taxonomy vocabulary"),
+ *   handlers = {
+ *     "storage" = "Drupal\taxonomy\VocabularyStorage",
+ *     "list_builder" = "Drupal\taxonomy\VocabularyListBuilder",
+ *     "form" = {
+ *       "default" = "Drupal\taxonomy\VocabularyForm",
+ *       "reset" = "Drupal\taxonomy\Form\VocabularyResetForm",
+ *       "delete" = "Drupal\taxonomy\Form\VocabularyDeleteForm"
+ *     }
+ *   },
+ *   admin_permission = "administer taxonomy",
+ *   config_prefix = "vocabulary",
+ *   bundle_of = "taxonomy_term",
+ *   entity_keys = {
+ *     "id" = "vid",
+ *     "label" = "name",
+ *     "weight" = "weight"
+ *   },
+ *   links = {
+ *     "add-form" = "/admin/structure/taxonomy/manage/{taxonomy_vocabulary}/add",
+ *     "delete-form" = "/admin/structure/taxonomy/manage/{taxonomy_vocabulary}/delete",
+ *     "reset-form" = "/admin/structure/taxonomy/manage/{taxonomy_vocabulary}/reset",
+ *     "overview-form" = "/admin/structure/taxonomy/manage/{taxonomy_vocabulary}/overview",
+ *     "edit-form" = "/admin/structure/taxonomy/manage/{taxonomy_vocabulary}",
+ *     "collection" = "/admin/structure/taxonomy",
+ *   },
+ *   config_export = {
+ *     "name",
+ *     "vid",
+ *     "description",
+ *     "hierarchy",
+ *     "weight",
+ *   }
+ * )
+ */
+class Vocabulary extends ConfigEntityBundleBase implements VocabularyInterface {
+
+  /**
+   * The taxonomy vocabulary ID.
+   *
+   * @var string
+   */
+  protected $vid;
+
+  /**
+   * Name of the vocabulary.
+   *
+   * @var string
+   */
+  protected $name;
+
+  /**
+   * Description of the vocabulary.
+   *
+   * @var string
+   */
+  protected $description;
+
+  /**
+   * The type of hierarchy allowed within the vocabulary.
+   *
+   * Possible values:
+   * - TAXONOMY_HIERARCHY_DISABLED: No parents.
+   * - TAXONOMY_HIERARCHY_SINGLE: Single parent.
+   * - TAXONOMY_HIERARCHY_MULTIPLE: Multiple parents.
+   *
+   * @var integer
+   */
+  protected $hierarchy = TAXONOMY_HIERARCHY_DISABLED;
+
+  /**
+   * The weight of this vocabulary in relation to other vocabularies.
+   *
+   * @var integer
+   */
+  protected $weight = 0;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getHierarchy() {
+    return $this->hierarchy;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setHierarchy($hierarchy) {
+    $this->hierarchy = $hierarchy;
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function id() {
+    return $this->vid;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDescription() {
+    return $this->description;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function postSave(EntityStorageInterface $storage, $update = TRUE) {
+    parent::postSave($storage, $update);
+
+    if ($update && $this->getOriginalId() != $this->id() && !$this->isSyncing()) {
+      // Reflect machine name changes in the definitions of existing 'taxonomy'
+      // fields.
+      $field_ids = array();
+      $field_map = \Drupal::entityManager()->getFieldMapByFieldType('entity_reference');
+      foreach ($field_map as $entity_type => $field_storages) {
+        foreach ($field_storages as $field_storage => $info) {
+          $field_ids[] = $entity_type . '.' . $field_storage;
+        }
+      }
+
+      $field_storages = \Drupal::entityManager()->getStorage('field_storage_config')->loadMultiple($field_ids);
+      $taxonomy_fields = array_filter($field_storages, function ($field_storage) {
+        return $field_storage->getType() == 'entity_reference' && $field_storage->getSetting('target_type') == 'taxonomy_term';
+      });
+
+      foreach ($taxonomy_fields as $field_storage) {
+        $update_storage = FALSE;
+
+        $allowed_values = $field_storage->getSetting('allowed_values');
+        foreach ($allowed_values as &$value) {
+          if ($value['vocabulary'] == $this->getOriginalId()) {
+            $value['vocabulary'] = $this->id();
+            $update_storage = TRUE;
+          }
+        }
+        $field_storage->setSetting('allowed_values', $allowed_values);
+
+        if ($update_storage) {
+          $field_storage->save();
+        }
+      }
+    }
+    $storage->resetCache($update ? array($this->getOriginalId()) : array());
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function preDelete(EntityStorageInterface $storage, array $entities) {
+    parent::preDelete($storage, $entities);
+
+    // Only load terms without a parent, child terms will get deleted too.
+    entity_delete_multiple('taxonomy_term', $storage->getToplevelTids(array_keys($entities)));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function postDelete(EntityStorageInterface $storage, array $entities) {
+    parent::postDelete($storage, $entities);
+
+    // Reset caches.
+    $storage->resetCache(array_keys($entities));
+
+    if (reset($entities)->isSyncing()) {
+      return;
+    }
+
+    $vocabularies = array();
+    foreach ($entities as $vocabulary) {
+      $vocabularies[$vocabulary->id()] = $vocabulary->id();
+    }
+    // Load all Taxonomy module fields and delete those which use only this
+    // vocabulary.
+    $field_storages = entity_load_multiple_by_properties('field_storage_config', array('module' => 'taxonomy'));
+    foreach ($field_storages as $field_storage) {
+      $modified_storage = FALSE;
+      // Term reference fields may reference terms from more than one
+      // vocabulary.
+      foreach ($field_storage->getSetting('allowed_values') as $key => $allowed_value) {
+        if (isset($vocabularies[$allowed_value['vocabulary']])) {
+          $allowed_values = $field_storage->getSetting('allowed_values');
+          unset($allowed_values[$key]);
+          $field_storage->setSetting('allowed_values', $allowed_values);
+          $modified_storage = TRUE;
+        }
+      }
+      if ($modified_storage) {
+        $allowed_values = $field_storage->getSetting('allowed_values');
+        if (empty($allowed_values)) {
+          $field_storage->delete();
+        }
+        else {
+          // Update the field definition with the new allowed values.
+          $field_storage->save();
+        }
+      }
+    }
+  }
+
+}