public function activateOptions() {
		parent::activateOptions();
	
		if (empty($this->datePattern)) {
			$this->warn("Required parameter 'datePattern' not set. Closing appender.");
			$this->closed = true;
			return;
		}
	}
public function activateOptions() {
		parent::activateOptions();
	
		if (empty($this->datePattern)) {
			$this->warn("Required parameter 'datePattern' not set. Closing appender.");
			$this->closed = true;
			return;
		}
	}
public function activateOptions ( ) { parent :: activateOptions ( ) ; if ( empty ( $ this -> datePattern ) ) { $ this -> warn ( "Required parameter 'datePattern' not set. Closing appender." ) ; $ this -> closed = true ; return ; } }
Additional validation for the date pattern.
Additional validation for the date pattern .