* for the level 4 operators, since they return boolean and don't accept
* boolean inputs.
*/
- static $precedence = array(
+ private static $precedence = array(
'or' => 2,
'and' => 3,
'is' => 4,
/**
* Private constructor.
+ * @param string $rule
*/
protected function __construct( $rule ) {
$this->rule = $rule;
/**
* Throw an error
+ * @param string $message
*/
protected function error( $message ) {
throw new CLDRPluralRuleError( $message );