/**
* Matches if value is not null.
*
* @factory
*/
public static function notNullValue()
{
if (!self::$_NOT_INSTANCE) {
self::$_NOT_INSTANCE = IsNot::not(self::nullValue());
}
return self::$_NOT_INSTANCE;
}
/**
* Matches if value is null.
*
* @factory
*/
public static function nullValue()
{
if (!self::$_INSTANCE) {
self::$_INSTANCE = new self();
}
return self::$_INSTANCE;
}