public function get_mapping() {
		if ( is_null( $this->mapping ) ) {
			$this->mapping = $this->normalize_mapping();
		}

		return $this->mapping;
	}
public function get_mapping() {
		if ( is_null( $this->mapping ) ) {
			$this->mapping = $this->normalize_mapping();
		}

		return $this->mapping;
	}
public function get_mapping ( ) { if ( is_null ( $ this -> mapping ) ) { $ this -> mapping = $ this -> normalize_mapping ( ) ; } return $ this -> mapping ; }
Get normalized of mapping.

@return array
Get normalized of mapping .