public char getPositionKey() {
        String value = Optional.fromNullable(getParameter(SignalParameters.POSITION_KEY.symbol())).or("");
        return value.isEmpty() ? ' ' : value.charAt(0);
    }
public char getPositionKey ( ) { String value = Optional . fromNullable ( getParameter ( SignalParameters . POSITION_KEY . symbol ( ) ) ) . or ( "" ) ; return value . isEmpty ( ) ? ' ' : value . charAt ( 0 ) ; }
Defines a key with the following action. Stop playing the current announcement and resume playing at the beginning of the
first, last, previous, next, or the current segment of the announcement.
<p>
<b>No default. The actions for the position key are fst, lst, prv, nxt, and cur.</b>
</p>

@return