Method mergeGeometryInternal

c++/src/Geospatial.cc:225–281

  }

  void WKBGeometryBounder::mergeGeometryInternal(WKBBuffer* src, bool recordWkbType) {
    uint8_t endian = src->readUInt8();
    bool swap = endian != 0x00;
    if (isLittleEndian()) {
      swap = endian != 0x01;
    }

    uint32_t wkbGeometryType = src->readUInt32(swap);
    auto geometryTypeAndDimensions = parseGeometryType(wkbGeometryType);
    if (!geometryTypeAndDimensions.has_value()) {
      invalidate();
      return;
    }
    auto& [geometry_type, dimensions] = geometryTypeAndDimensions.value();

    // Keep track of geometry types encountered if at the top level
    if (recordWkbType) {
      geospatialTypes_.insert(static_cast<int32_t>(wkbGeometryType));
    }

    switch (geometry_type) {
      case GeometryType::POINT:
        mergeSequence(src, dimensions, 1, swap);
        break;

      case GeometryType::LINESTRING: {
        uint32_t nCoords = src->readUInt32(swap);
        mergeSequence(src, dimensions, nCoords, swap);
        break;
      }
      case GeometryType::POLYGON: {
        uint32_t n_parts = src->readUInt32(swap);
        for (uint32_t i = 0; i < n_parts; i++) {
          uint32_t nCoords = src->readUInt32(swap);
          mergeSequence(src, dimensions, nCoords, swap);
        }
        break;
      }

      // These are all encoded the same in WKB, even though this encoding would
      // allow for parts to be of a different geometry type or different dimensions.
      // For the purposes of bounding, this does not cause us problems. We pass
      // record_wkb_type = false because we do not want the child geometry to be
      // added to the geometry_types list (e.g., for a MultiPoint, we only want
      // the code for MultiPoint to be added, not the code for Point).
      case GeometryType::MULTIPOINT:
      case GeometryType::MULTILINESTRING:
      case GeometryType::MULTIPOLYGON:
      case GeometryType::GEOMETRYCOLLECTION: {
        uint32_t n_parts = src->readUInt32(swap);
        for (uint32_t i = 0; i < n_parts; i++) {
          mergeGeometryInternal(src, /*record_wkb_type*/ false);
        }
        break;
      }
    }
  }