public function GetFilter ($direction = \MvcCore\IRoute::CONFIG_FILTER_IN) {
		return isset($this->filters[$direction])
			? $this->filters[$direction]
			: NULL;
	}
public function GetFilter ($direction = \MvcCore\IRoute::CONFIG_FILTER_IN) {
		return isset($this->filters[$direction])
			? $this->filters[$direction]
			: NULL;
	}
public function GetFilter ( $ direction = \ MvcCore \ IRoute :: CONFIG_FILTER_IN ) { return isset ( $ this -> filters [ $ direction ] ) ? $ this -> filters [ $ direction ] : NULL ; }
Get URL address params filter to filter URL params in and out. By route
filter you can change incoming request params into application and out
from application. For example to translate the values or anything else.

Filter is `callable` accepting arguments:
- `$params`  associative array with params from requested URL address for
in filter and associative array with params to build URL
address for out filter.
- `$defaultParams`	associative array with default params to store
any custom value necessary to filter effectively.
- `$request`	current request instance implements `\MvcCore\IRequest`.

`Callable` filter must return associative `array` with filtered params.

There is possible to call any `callable` as closure function in variable
except forms like `'ClassName::methodName'` and `['childClassName',
'parent::methodName']` and `[$childInstance, 'parent::methodName']`.
@return \callable|NULL
Get URL address params filter to filter URL params in and out . By route filter you can change incoming request params into application and out from application . For example to translate the values or anything else .