public function calculate($calculate = null) {
		if ($calculate) {
			$this->_config['calculate'] = $calculate;
			return $this;
		}
		return $this->_config['calculate'];
	}
public function calculate($calculate = null) {
		if ($calculate) {
			$this->_config['calculate'] = $calculate;
			return $this;
		}
		return $this->_config['calculate'];
	}
public function calculate ( $ calculate = null ) { if ( $ calculate ) { $ this -> _config [ 'calculate' ] = $ calculate ; return $ this ; } return $ this -> _config [ 'calculate' ] ; }
Accessor method for `Query` calculate values.

@param string $calculate Value for calculate config setting.
@return mixed Current calculate config value.
Accessor method for Query calculate values .