public function __construct(array $values, $entity_type, $bundle = FALSE, $translations = array()) {

    parent::__construct($values, $entity_type, $bundle = FALSE, $translations = array());

    $values += $this->generateCharacteristics();

    foreach ($values as $key => $value)
    {

        $method = 'set'.ucfirst($key);

        // For two-words attributes
        if( strstr($method, '_') ) {
            $method = explode('_', $method);
            $method[1] = ucfirst($method[1]);
            $method = implode('', $method);
        }

        if (method_exists($this, $method))
        {
          $this->$method($value);
        }
    }


}