protected function StorableConfigBase::castValue

Casts the value to correct data type using the configuration schema.

Parameters

string|null $key: A string that maps to a key within the configuration data. If NULL the top level mapping will be processed.

mixed $value: Value to associate with the key.

Return value

mixed The value cast to the type indicated in the schema.

Throws

\Drupal\Core\Config\UnsupportedDataTypeConfigException If the value is unsupported in configuration.

File

core/lib/Drupal/Core/Config/StorableConfigBase.php, line 220

Class

StorableConfigBase

Provides a base class for configuration objects with storage support.

Namespace

Code

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;
}