abstract class StorableConfigBase in Drupal 10

Provides a base class for configuration objects with storage support.

Encapsulates all capabilities needed for configuration handling for a specific configuration object, including storage and data type casting.

The default implementation in \Drupal\Core\Config\Config adds support for runtime overrides. Extend from StorableConfigBase directly to manage configuration with a storage backend that does not support overrides.

Hierarchy

• class \Drupal\Core\Config\ConfigBase implements RefinableCacheableDependencyInterface uses RefinableCacheableDependencyTrait, DependencySerializationTrait
  • class \Drupal\Core\Config\StorableConfigBase

See also

\Drupal\Core\Config\Config

2 files declare their use of StorableConfigBase

LanguageConfigOverride.php in core/modules/language/src/Config/LanguageConfigOverride.php

LocaleConfigSubscriber.php in core/modules/locale/src/LocaleConfigSubscriber.php

File

core/lib/Drupal/Core/Config/StorableConfigBase.php, line 26

Namespace

Drupal\Core\Config

abstract class StorableConfigBase extends ConfigBase {

  /**
   * The storage used to load and save this configuration object.
   *
   * @var \Drupal\Core\Config\StorageInterface
   */
  protected $storage;

  /**
   * The config schema wrapper object for this configuration object.
   *
   * @var \Drupal\Core\Config\Schema\Element
   */
  protected $schemaWrapper;

  /**
   * The typed config manager.
   *
   * @var \Drupal\Core\Config\TypedConfigManagerInterface
   */
  protected $typedConfigManager;

  /**
   * Whether the configuration object is new or has been saved to the storage.
   *
   * @var bool
   */
  protected $isNew = TRUE;

  /**
   * The data of the configuration object.
   *
   * @var array
   */
  protected $originalData = [];

  /**
   * Saves the configuration object.
   *
   * Must invalidate the cache tags associated with the configuration object.
   *
   * @param bool $has_trusted_data
   *   Set to TRUE if the configuration data has already been checked to ensure
   *   it conforms to schema. Generally this is only used during module and
   *   theme installation.
   *
   * @return $this
   *
   * @see \Drupal\Core\Config\ConfigInstaller::createConfiguration()
   */
  public abstract function save($has_trusted_data = FALSE);

  /**
   * Deletes the configuration object.
   *
   * Must invalidate the cache tags associated with the configuration object.
   *
   * @return $this
   */
  public abstract function delete();

  /**
   * Initializes a configuration object with pre-loaded data.
   *
   * @param array $data
   *   Array of loaded data for this configuration object.
   *
   * @return $this
   *   The configuration object.
   */
  public function initWithData(array $data) {
    $this->isNew = FALSE;
    $this->data = $data;
    $this->originalData = $this->data;
    return $this;
  }

  /**
   * Returns whether this configuration object is new.
   *
   * @return bool
   *   TRUE if this configuration object does not exist in storage.
   */
  public function isNew() {
    return $this->isNew;
  }

  /**
   * Retrieves the storage used to load and save this configuration object.
   *
   * @return \Drupal\Core\Config\StorageInterface
   *   The configuration storage object.
   */
  public function getStorage() {
    return $this->storage;
  }

  /**
   * Gets the schema wrapper for the whole configuration object.
   *
   * The schema wrapper is dependent on the configuration name and the whole
   * data structure, so if the name or the data changes in any way, the wrapper
   * should be reset.
   *
   * @return \Drupal\Core\Config\Schema\Element
   */
  protected function getSchemaWrapper() {
    if (!isset($this->schemaWrapper)) {
      $this->schemaWrapper = $this->typedConfigManager
        ->createFromNameAndData($this->name, $this->data);
    }
    return $this->schemaWrapper;
  }

  /**
   * Validate the values are allowed data types.
   *
   * @param string $key
   *   A string that maps to a key within the configuration data.
   * @param mixed $value
   *   Value to associate with the key.
   *
   * @return null
   *
   * @throws \Drupal\Core\Config\UnsupportedDataTypeConfigException
   *   If the value is unsupported in configuration.
   */
  protected function validateValue($key, $value) {

    // Minimal validation. Should not try to serialize resources or non-arrays.
    if (is_array($value)) {
      foreach ($value as $nested_value_key => $nested_value) {
        $this
          ->validateValue($key . '.' . $nested_value_key, $nested_value);
      }
    }
    elseif ($value !== NULL && !is_scalar($value)) {
      throw new UnsupportedDataTypeConfigException("Invalid data type for config element {$this->getName()}:{$key}");
    }
  }

  /**
   * Casts the value to correct data type using the configuration schema.
   *
   * @param string|null $key
   *   A string that maps to a key within the configuration data. If NULL the
   *   top level mapping will be processed.
   * @param mixed $value
   *   Value to associate with the key.
   *
   * @return mixed
   *   The value cast to the type indicated in the schema.
   *
   * @throws \Drupal\Core\Config\UnsupportedDataTypeConfigException
   *   If the value is unsupported in configuration.
   */
  protected function castValue($key, $value) {
    $element = $this
      ->getSchemaWrapper();
    if ($key !== NULL) {
      $element = $element
        ->get($key);
    }

    // Do not cast value if it is unknown or defined to be ignored.
    if ($element && ($element instanceof Undefined || $element instanceof Ignore)) {

      // Do validate the value (may throw UnsupportedDataTypeConfigException)
      // to ensure unsupported types are not supported in this case either.
      $this
        ->validateValue($key, $value);
      return $value;
    }
    if (is_scalar($value) || $value === NULL) {
      if ($element && $element instanceof PrimitiveInterface) {

        // Special handling for integers and floats since the configuration
        // system is primarily concerned with saving values from the Form API
        // we have to special case the meaning of an empty string for numeric
        // types. In PHP this would be casted to a 0 but for the purposes of
        // configuration we need to treat this as a NULL.
        $empty_value = $value === '' && ($element instanceof IntegerInterface || $element instanceof FloatInterface);
        if ($value === NULL || $empty_value) {
          $value = NULL;
        }
        else {
          $value = $element
            ->getCastedValue();
        }
      }
    }
    else {

      // Throw exception on any non-scalar or non-array value.
      if (!is_array($value)) {
        throw new UnsupportedDataTypeConfigException("Invalid data type for config element {$this->getName()}:{$key}");
      }

      // Recurse into any nested keys.
      foreach ($value as $nested_value_key => $nested_value) {
        $lookup_key = $key ? $key . '.' . $nested_value_key : $nested_value_key;
        $value[$nested_value_key] = $this
          ->castValue($lookup_key, $nested_value);
      }

      // Only sort maps when we have more than 1 element to sort.
      if ($element instanceof Mapping && count($value) > 1) {
        $mapping = $element
          ->getDataDefinition()['mapping'];
        if (is_array($mapping)) {

          // Only sort the keys in $value.
          $mapping = array_intersect_key($mapping, $value);

          // Sort the array in $value using the mapping definition.
          $value = array_replace($mapping, $value);
        }
      }
      if ($element instanceof Sequence) {
        $data_definition = $element
          ->getDataDefinition();
        if ($data_definition instanceof SequenceDataDefinition) {

          // Apply any sorting defined on the schema.
          switch ($data_definition
            ->getOrderBy()) {
            case 'key':
              ksort($value);
              break;
            case 'value':

              // The PHP documentation notes that "Be careful when sorting
              // arrays with mixed types values because sort() can produce
              // unpredictable results". There is no risk here because
              // \Drupal\Core\Config\StorableConfigBase::castValue() has
              // already cast all values to the same type using the
              // configuration schema.
              sort($value);
              break;
          }
        }
      }
    }
    return $value;
  }

}