code: public void setPlacementSegment(com.google.api.ads.admanager.axis.v201902.PlacementTargeting placementSegment) {
          this.placementSegment = placementSegment;
      }
docs: Sets the placementSegment value for this ProductSegmentation.
  
  @param placementSegment   * The placement targeting segmentation.
  
  <p>This attribute is optional.