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<?php
/**
 * @file
 * Contains \Drupal\user\UserStorageSchema.
 */
namespace Drupal\user;
use Drupal\Core\Entity\ContentEntityTypeInterface;
use Drupal\Core\Entity\Sql\SqlContentEntityStorageSchema;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
/**
 * Defines the user schema handler.
 */
class UserStorageSchema extends SqlContentEntityStorageSchema {
  /**
   * {@inheritdoc}
   */
  protected function getEntitySchema(ContentEntityTypeInterface $entity_type, $reset = FALSE) {
    $schema = parent::getEntitySchema($entity_type, $reset);
    $schema['users_field_data']['unique keys'] += array(
      'user__name' => array('name', 'langcode'),
    );
    return $schema;
  }
  /**
   * {@inheritdoc}
   */
  protected function processIdentifierSchema(&$schema, $key) {
    // The "users" table does not use serial identifiers.
    if ($key != $this->entityType->getKey('id')) {
      parent::processIdentifierSchema($schema, $key);
    }
  }
  /**
   * {@inheritdoc}
   */
  protected function getSharedTableFieldSchema(FieldStorageDefinitionInterface $storage_definition, $table_name, array $column_mapping) {
    $schema = parent::getSharedTableFieldSchema($storage_definition, $table_name, $column_mapping);
    $field_name = $storage_definition->getName();
    if ($table_name == 'users_field_data') {
      switch ($field_name) {
        case 'name':
          // Improves the performance of the user__name index defined
          // in getEntitySchema().
          $schema['fields'][$field_name]['not null'] = TRUE;
          // Make sure the field is no longer than 191 characters so we can
          // add a unique constraint in MySQL.
          $schema['fields'][$field_name]['length'] = USERNAME_MAX_LENGTH;
          break;
        case 'mail':
          $this->addSharedTableFieldIndex($storage_definition, $schema);
          break;
        case 'access':
        case 'created':
          $this->addSharedTableFieldIndex($storage_definition, $schema, TRUE);
          break;
      }
    }
    return $schema;
  }
}