code: protected String determineSegmentValue(Properties params) {
  		String segmentValue = params.getProperty( SEGMENT_VALUE_PARAM );
  		if ( StringHelper.isEmpty( segmentValue ) ) {
  			segmentValue = determineDefaultSegmentValue( params );
  		}
  		return segmentValue;
  	}
docs: Determine the segment value corresponding to this generator instance.
  <p>
  Called during {@link #configure configuration}.
  
  @param params The params supplied in the generator config (plus some standard useful extras).
  
  @return The name of the value column