FieldConfigStorage::loadByProperties

public FieldConfigStorage::loadByProperties(array $conditions = array())

public function loadByProperties(array $conditions = array()) {
  // Include deleted fields if specified in the $conditions parameters.
  $include_deleted = isset($conditions['include_deleted']) ? $conditions['include_deleted'] : FALSE;
  unset($conditions['include_deleted']);

  $fields = array();

  // Get fields stored in configuration. If we are explicitly looking for
  // deleted fields only, this can be skipped, because they will be
  // retrieved from state below.
  if (empty($conditions['deleted'])) {
    if (isset($conditions['entity_type']) && isset($conditions['bundle']) && isset($conditions['field_name'])) {
      // Optimize for the most frequent case where we do have a specific ID.
      $id = $conditions['entity_type'] . '.' . $conditions['bundle'] . '.' . $conditions['field_name'];
      $fields = $this->loadMultiple(array($id));
    }
    else {
      // No specific ID, we need to examine all existing fields.
      $fields = $this->loadMultiple();
    }
  }

  // Merge deleted fields (stored in state) if needed.
  if ($include_deleted || !empty($conditions['deleted'])) {
    $deleted_fields = $this->state->get('field.field.deleted') ? : array();
    $deleted_storages = $this->state->get('field.storage.deleted') ? : array();
    foreach ($deleted_fields as $id => $config) {
      // If the field storage itself is deleted, inject it directly in the field.
      if (isset($deleted_storages[$config['field_storage_uuid']])) {
        $config['field_storage'] = $this->entityManager->getStorage('field_storage_config')->create($deleted_storages[$config['field_storage_uuid']]);
      }
      $fields[$id] = $this->create($config);
    }
  }

  // Collect matching fields.
  $matching_fields = array();
  foreach ($fields as $field) {
    // Some conditions are checked against the field storage.
    $field_storage = $field->getFieldStorageDefinition();

    // Only keep the field if it matches all conditions.
    foreach ($conditions as $key => $value) {
      // Extract the actual value against which the condition is checked.
      switch ($key) {
        case 'field_name':
          $checked_value = $field_storage->getName();
          break;

        case 'field_id':
        case 'field_storage_uuid':
          $checked_value = $field_storage->uuid();
          break;

        case 'uuid':
          $checked_value = $field->uuid();
          break;

        case 'deleted':
          $checked_value = $field->isDeleted();
          break;

        default:
          $checked_value = $field->get($key);
          break;
      }

      // Skip to the next field as soon as one condition does not match.
      if ($checked_value != $value) {
        continue 2;
      }
    }

    // When returning deleted fields, key the results by UUID since they
    // can include several fields with the same ID.
    $key = $include_deleted ? $field->uuid() : $field->id();
    $matching_fields[$key] = $field;
  }

  return $matching_fields;
}