code: public boolean hasGaps(int gapLength) {
  		Location last = null;
  		for (FeatureI f : this) {
  			if (last != null && gapLength <= f.location().distance(last)) {
  				return true;
  			} else {
  				last = f.location();
  			}
  		}
  
  		return false;
  	}
docs: Check size of gaps between successive features in list. The features in
  the list are assumed to be appropriately ordered.
  
  @param gapLength The minimum gap length to consider. Use a gapLength
  of 0 to check if features are contiguous.
  @return True if list has any gaps equal to or greater than gapLength.