diff core/modules/field/src/FieldUninstallValidator.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/field/src/FieldUninstallValidator.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,102 @@
+<?php
+
+namespace Drupal\field;
+
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Extension\ModuleUninstallValidatorInterface;
+use Drupal\Core\Field\FieldTypePluginManagerInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\Core\StringTranslation\TranslationInterface;
+
+/**
+ * Prevents uninstallation of modules providing active field storage.
+ */
+class FieldUninstallValidator implements ModuleUninstallValidatorInterface {
+
+  use StringTranslationTrait;
+
+  /**
+   * The field storage config storage.
+   *
+   * @var \Drupal\Core\Config\Entity\ConfigEntityStorageInterface
+   */
+  protected $fieldStorageConfigStorage;
+
+  /**
+   * The field type plugin manager.
+   *
+   * @var \Drupal\Core\Field\FieldTypePluginManagerInterface
+   */
+  protected $fieldTypeManager;
+
+  /**
+   * Constructs a new FieldUninstallValidator.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity manager.
+   * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
+   *   The string translation service.
+   * @param \Drupal\Core\Field\FieldTypePluginManagerInterface $field_type_manager
+   *   The field type plugin manager.
+   */
+  public function __construct(EntityTypeManagerInterface $entity_type_manager, TranslationInterface $string_translation, FieldTypePluginManagerInterface $field_type_manager) {
+    $this->fieldStorageConfigStorage = $entity_type_manager->getStorage('field_storage_config');
+    $this->stringTranslation = $string_translation;
+    $this->fieldTypeManager = $field_type_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validate($module) {
+    $reasons = [];
+    if ($field_storages = $this->getFieldStoragesByModule($module)) {
+      // Provide an explanation message (only mention pending deletions if there
+      // remain no actual, non-deleted fields.)
+      $fields_in_use = [];
+      foreach ($field_storages as $field_storage) {
+        if (!$field_storage->isDeleted()) {
+          $fields_in_use[$field_storage->getType()][] = $field_storage->getLabel();
+        }
+      }
+      if (!empty($fields_in_use)) {
+        foreach ($fields_in_use as $field_type => $field_storages) {
+          $field_type_label = $this->getFieldTypeLabel($field_type);
+          $reasons[] = $this->formatPlural(count($fields_in_use[$field_type]), 'The %field_type_label field type is used in the following field: @fields', 'The %field_type_label field type is used in the following fields: @fields', ['%field_type_label' => $field_type_label, '@fields' => implode(', ', $field_storages)]);
+        }
+      }
+      else {
+        $reasons[] = $this->t('Fields pending deletion');
+      }
+    }
+    return $reasons;
+  }
+
+  /**
+   * Returns all field storages for a specified module.
+   *
+   * @param string $module
+   *   The module to filter field storages by.
+   *
+   * @return \Drupal\field\FieldStorageConfigInterface[]
+   *   An array of field storages for a specified module.
+   */
+  protected function getFieldStoragesByModule($module) {
+    return $this->fieldStorageConfigStorage->loadByProperties(['module' => $module, 'include_deleted' => TRUE]);
+  }
+
+
+  /**
+   * Returns the label for a specified field type.
+   *
+   * @param string $field_type
+   *   The field type.
+   *
+   * @return string
+   *   The field type label.
+   */
+  protected function getFieldTypeLabel($field_type) {
+    return $this->fieldTypeManager->getDefinitions()[$field_type]['label'];
+  }
+
+}