class RulesEvaluationException

class RulesEvaluationException extends RulesException {
    public $msg;
    public $args;
    public $severity;
    public $element;
    public $keys = array();
    
    /**
     * Constructor.
     *
     * @param string $msg
     *   The exception message containing placeholder as t().
     * @param array $args
     *   Replacement arguments such as for t().
     * @param $element
     *   The element of a configuration causing the exception or an array
     *   consisting of the element and keys specifying a setting value causing
     *   the exception.
     * @param int $severity
     *   The RulesLog severity. Defaults to RulesLog::WARN.
     */
    public function __construct($msg, array $args = array(), $element = NULL, $severity = RulesLog::WARN) {
        $this->element = is_array($element) ? array_shift($element) : $element;
        $this->keys = is_array($element) ? $element : array();
        $this->msg = $msg;
        $this->args = $args;
        $this->severity = $severity;
        // If an error happened, run the integrity check on the rules configuration
        // and mark it as dirty if it the check fails.
        if ($severity == RulesLog::ERROR && isset($this->element)) {
            $rules_config = $this->element
                ->root();
            rules_config_update_dirty_flag($rules_config);
            // If we discovered a broken configuration, exclude it in future.
            if ($rules_config->dirty) {
                rules_clear_cache();
            }
        }
        // @todo Fix _drupal_decode_exception() to use __toString() and override it.
        $this->message = t($this->msg, $this->args);
    }

}