public java.util.List<org.bwapi.proxy.messages.TerrainMessages.Polygon> getUnwalkablePolygonList() {
        if (unwalkablePolygonBuilder_ == null) {
          return java.util.Collections.unmodifiableList(unwalkablePolygon_);
        } else {
          return unwalkablePolygonBuilder_.getMessageList();
        }
      }