/**
	 * Opens the logfile for writing.
	 *
	 * @param  $filename       Filename to open
	 * @param  $accessMode     Either "w"rite or "a"ppend
	 * @return bool            True
	 */
	public function open($filename=null, $accessMode=null)
	{
        if ($filename !== null) {
            $this->_filename = $filename;
        }

        if ($accessMode !== null) {
            $this->_setAccessMode($accessMode);
        }
        
        if (! $this->_fileResource = @fopen($this->_filename, $this->_accessMode, false)) {
            throw new Zend_Log_Adapter_Exception("Log file \"$filename\" could not be opened");
        }

        return true;
	}