feat(autoware_lanelet_map_validator): add dangling reference checker to non existing intersection_area

map/autoware_lanelet2_map_validator/CMakeLists.txt

@@ -67,6 +67,7 @@ if(BUILD_TESTING)
   add_validation_test(missing_referrers_for_traffic_lights)
   add_validation_test(intersection_area_validity)
   add_validation_test(intersection_area_segment_type)
+  add_validation_test(intersection_area_dangling_reference)
 endif()
 
 ament_auto_package(

map/autoware_lanelet2_map_validator/README.md

@@ -319,7 +319,7 @@ The "Validators" column will be blank if it hasn't be implemented.
 | vm-01-19 | Walkway                                                 |                                                                                                                                                                                                                                                                                                                                                                 |
 | vm-02-01 | Stop line alignment                                     | (Not detectable)                                                                                                                                                                                                                                                                                                                                                |
 | vm-02-02 | Stop sign                                               | [mapping.stop_line.missing_regulatory_elements](./docs/stop_line/missing_regulatory_elements_for_stop_lines.md)                                                                                                                                                                                                                                                 |
-| vm-03-01 | Intersection criteria                                   |                                                                                                                                                                                                                                                                                                                                                                 |
+| vm-03-01 | Intersection criteria                                   | [mapping.intersection.intersection_area_dangling_reference](./docs/intersection/intersection_area_dangling_reference.md)                                                                                                                                                                                                                                        |
 | vm-03-02 | Lanelet's turn direction and virtual                    |                                                                                                                                                                                                                                                                                                                                                                 |
 | vm-03-03 | Lanelet width in the intersection                       |                                                                                                                                                                                                                                                                                                                                                                 |
 | vm-03-04 | Lanelet creation in the intersection                    |                                                                                                                                                                                                                                                                                                                                                                 |

map/autoware_lanelet2_map_validator/autoware_requirement_set.json

@@ -8,6 +8,14 @@
         }
       ]
     },
+    {
+      "id": "vm-03-01",
+      "validators": [
+        {
+          "name": "mapping.intersection.intersection_area_dangling_reference"
+        }
+      ]
+    },
     {
       "id": "vm-03-08",
       "validators": [

map/autoware_lanelet2_map_validator/docs/intersection/intersection_area_dangling_reference.md

@@ -0,0 +1,27 @@
+# intersection_area_dangling_reference
+
+## Validator name
+
+mapping.intersection.intersection_area_dangling_reference
+
+## Feature
+
+This validator check whether each intersection lanelet(namely the lanelet with `turn_direction` property) has existing reference to `intersection_area` polygon. The countercase occurs when an existing intersection_area is deleted but its referrers are not updated.
+
+This is achieved by the following procedure.
+
+1. Obtain the set of `intersection_area` polygon IDs
+2. Check if intersection lanelet has "intersection_area" key and its value is contained in the above IDs
+
+The validator outputs the following issue with the corresponding ID of the primitive.
+
+| Issue Code                                         | Message                                                                                 | Severity | Primitive | Description                                                                        | Approach                                                             |
+| -------------------------------------------------- | --------------------------------------------------------------------------------------- | -------- | --------- | ---------------------------------------------------------------------------------- | -------------------------------------------------------------------- |
+| Intersection.IntersectionAreaDanglingReference-001 | "Dangling reference to non-existing intersection area of ID \<LANELET ID\> is detected" | Error    | Lanelet   | Lookup to `intersection_area` from the reporeted lanelet will cause runtime error. | Go to the reported lanelet and delete "intersection_area" key entry. |
+
+### Supplementary information
+
+## Related source codes
+
+- intersection_area_dangling_reference.hpp
+- intersection_area_dangling_reference.cpp

map/autoware_lanelet2_map_validator/src/include/lanelet2_map_validator/validators/intersection/intersection_area_dangling_reference.hpp

@@ -0,0 +1,51 @@
+// Copyright 2024 Autoware Foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef LANELET2_MAP_VALIDATOR__VALIDATORS__INTERSECTION__INTERSECTION_AREA_DANGLING_REFERENCE_HPP_  // NOLINT
+#define LANELET2_MAP_VALIDATOR__VALIDATORS__INTERSECTION__INTERSECTION_AREA_DANGLING_REFERENCE_HPP_  // NOLINT
+
+#include <lanelet2_validation/Validation.h>
+#include <lanelet2_validation/ValidatorFactory.h>
+
+#include <string>
+#include <utility>
+
+namespace lanelet::autoware::validation
+{
+class IntersectionAreaDanglingReferenceValidator : public lanelet::validation::MapValidator
+{
+public:
+  constexpr static const char * name()
+  {
+    return "mapping.intersection.intersection_area_dangling_reference";
+  }
+
+  lanelet::validation::Issues operator()(const lanelet::LaneletMap & map) override;
+
+private:
+  /**
+   * @brief queries all intersection lanelets and check if their "intersection_area" custom KEY
+   * entry has existing id as VALUE
+   *
+   * @param map
+   * @return lanelet::validation::Issues
+   */
+  lanelet::validation::Issues check_intersection_area_dangling_reference(
+    const lanelet::LaneletMap & map);
+};
+}  // namespace lanelet::autoware::validation
+
+// clang-format off
+#endif  // LANELET2_MAP_VALIDATOR__VALIDATORS__INTERSECTION__INTERSECTION_AREA_DANGLING_REFERENCE_HPP_  // NOLINT
+// clang-format on

map/autoware_lanelet2_map_validator/src/validators/intersection/intersection_area_dangling_reference.cpp

@@ -0,0 +1,91 @@
+// Copyright 2024 Autoware Foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "lanelet2_map_validator/validators/intersection/intersection_area_dangling_reference.hpp"
+
+#include "lanelet2_map_validator/utils.hpp"
+
+#include <lanelet2_core/LaneletMap.h>
+
+#include <optional>
+#include <string>
+#include <unordered_set>
+#include <vector>
+
+namespace lanelet::autoware::validation
+{
+
+namespace
+{
+lanelet::validation::RegisterMapValidator<IntersectionAreaDanglingReferenceValidator> reg;
+}  // namespace
+
+lanelet::validation::Issues IntersectionAreaDanglingReferenceValidator::operator()(
+  const lanelet::LaneletMap & map)
+{
+  lanelet::validation::Issues issues;
+
+  lanelet::autoware::validation::appendIssues(
+    issues, check_intersection_area_dangling_reference(map));
+
+  return issues;
+}
+
+lanelet::validation::Issues
+IntersectionAreaDanglingReferenceValidator::check_intersection_area_dangling_reference(
+  const lanelet::LaneletMap & map)
+{
+  // returns the VALUE of intersection_area key
+  auto is_intersection_with_area = [](const auto & lanelet) -> std::optional<lanelet::Id> {
+    if (lanelet.attributeOr("turn_direction", "none") == std::string("none")) {
+      return std::nullopt;
+    }
+
+    const std::string id_str = lanelet.attributeOr("intersection_area", "none");
+    if (id_str == std::string("none")) {
+      return std::nullopt;
+    }
+
+    const auto id = static_cast<lanelet::Id>(std::atoi(id_str.c_str()));
+    return id;
+  };
+
+  std::unordered_set<lanelet::Id> intersection_area_ids;
+  for (const auto & area : map.polygonLayer) {
+    if (
+      area.attributeOr(lanelet::AttributeName::Type, "none") == std::string("intersection_area")) {
+      intersection_area_ids.emplace(area.id());
+    }
+  }
+
+  lanelet::validation::Issues issues;
+  for (const auto & lanelet : map.laneletLayer) {
+    if (const auto id_opt = is_intersection_with_area(lanelet); id_opt) {
+      const auto id = id_opt.value();
+      if (intersection_area_ids.find(id) == intersection_area_ids.end()) {
+        issues.emplace_back(
+          lanelet::validation::Severity::Error, lanelet::validation::Primitive::Lanelet,
+          lanelet.id(),
+          append_issue_code_prefix(
+            this->name(), 1,
+            "Dangling reference to non-existing intersection area of ID " + std::to_string(id) +
+              " is detected"));
+      }
+    }
+  }
+
+  return issues;
+}
+
+}  // namespace lanelet::autoware::validation