feat: Add shapes.txt validator

main/src/main/java/org/mobilitydata/gtfsvalidator/reportsummary/model/FeedMetadata.java

@@ -183,7 +183,7 @@ private <E extends GtfsEntity> int loadUniqueCount(
    *     "Zone-Based Demand Responsive Transit" feature.
    * @return true if at least one trip with only location_id is found, false otherwise.
    */
-  private boolean hasAtLeastOneTripWithOnlyLocationId(GtfsFeedContainer feedContainer) {
+  public static boolean hasAtLeastOneTripWithOnlyLocationId(GtfsFeedContainer feedContainer) {
     var optionalStopTimeTable = feedContainer.getTableForFilename(GtfsStopTime.FILENAME);
     if (optionalStopTimeTable.isPresent()) {
       for (GtfsEntity entity : optionalStopTimeTable.get().getEntities()) {
@@ -206,7 +206,7 @@ private boolean hasAtLeastOneTripWithOnlyLocationId(GtfsFeedContainer feedContai
    *     "Fixed-Stops Demand Responsive Transit" feature.
    * @return true if at least one trip with only location_group_id is found, false otherwise.
    */
-  private boolean hasAtLeastOneTripWithOnlyLocationGroupId(GtfsFeedContainer feedContainer) {
+  public static boolean hasAtLeastOneTripWithOnlyLocationGroupId(GtfsFeedContainer feedContainer) {
     var optionalStopTimeTable = feedContainer.getTableForFilename(GtfsStopTime.FILENAME);
     if (optionalStopTimeTable.isPresent()) {
       for (GtfsEntity entity : optionalStopTimeTable.get().getEntities()) {
@@ -791,7 +791,7 @@ public void loadServiceWindow(
     }
   }
 
-  private boolean hasAtLeastOneRecordInFile(
+  public static boolean hasAtLeastOneRecordInFile(
       GtfsFeedContainer feedContainer, String featureFilename) {
     var table = feedContainer.getTableForFilename(featureFilename);
     return table.isPresent() && table.get().entityCount() > 0;

main/src/main/java/org/mobilitydata/gtfsvalidator/validator/MissingShapesFileValidator.java

@@ -0,0 +1,51 @@
+package org.mobilitydata.gtfsvalidator.validator;
+
+import javax.inject.Inject;
+import org.mobilitydata.gtfsvalidator.annotation.GtfsValidator;
+import org.mobilitydata.gtfsvalidator.notice.MissingRecommendedFileNotice;
+import org.mobilitydata.gtfsvalidator.notice.NoticeContainer;
+import org.mobilitydata.gtfsvalidator.reportsummary.model.FeedMetadata;
+import org.mobilitydata.gtfsvalidator.table.GtfsFeedContainer;
+import org.mobilitydata.gtfsvalidator.table.GtfsLocationGroupsTableContainer;
+import org.mobilitydata.gtfsvalidator.table.GtfsShapeTableContainer;
+
+/**
+ * Validates that the feed has either a `shapes.txt` file, or uses zone-based DRT or fixed-stops
+ * DRT.
+ *
+ * <p>Generated notice: {@link MissingRecommendedFileNotice}.
+ */
+@GtfsValidator
+public class MissingShapesFileValidator extends FileValidator {
+  private final GtfsShapeTableContainer shapeTable;
+  private final GtfsLocationGroupsTableContainer locationGroups;
+  private final GtfsFeedContainer feedContainer;
+
+  @Inject
+  MissingShapesFileValidator(
+      GtfsShapeTableContainer shapeTable,
+      GtfsLocationGroupsTableContainer locationGroups,
+      GtfsFeedContainer feedContainer) {
+    this.shapeTable = shapeTable;
+    this.locationGroups = locationGroups;
+    this.feedContainer = feedContainer;
+  }
+
+  @Override
+  public void validate(NoticeContainer noticeContainer) {
+
+    Boolean missingShapes = shapeTable == null || shapeTable.isMissingFile();
+    boolean hasZoneBasedDrt = FeedMetadata.hasAtLeastOneTripWithOnlyLocationId(feedContainer);
+    boolean hasFixedStopsDrt =
+        FeedMetadata.hasAtLeastOneRecordInFile(feedContainer, "location_groups.txt")
+            && FeedMetadata.hasAtLeastOneTripWithOnlyLocationGroupId(feedContainer);
+
+    // Do we NOT have: a shapes.txt file and the required fields for Zone-Based DRT,
+    // and also the required fields for Fixed-Stop DRT?
+    if (missingShapes && !hasZoneBasedDrt && !hasFixedStopsDrt) {
+      noticeContainer.addValidationNotice(new MissingRecommendedFileNotice("shapes.txt"));
+      // This is a feed-level warning; emit it at most once.
+      return;
+    }
+  }
+}

main/src/test/java/org/mobilitydata/gtfsvalidator/validator/MissingShapesFileValidatorTest.java

@@ -0,0 +1,104 @@
+package org.mobilitydata.gtfsvalidator.validator;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.collect.ImmutableList;
+import java.util.ArrayList;
+import java.util.List;
+import org.junit.Test;
+import org.mobilitydata.gtfsvalidator.notice.MissingRecommendedFileNotice;
+import org.mobilitydata.gtfsvalidator.notice.NoticeContainer;
+import org.mobilitydata.gtfsvalidator.notice.ValidationNotice;
+import org.mobilitydata.gtfsvalidator.table.GtfsFeedContainer;
+import org.mobilitydata.gtfsvalidator.table.GtfsLocationGroups;
+import org.mobilitydata.gtfsvalidator.table.GtfsLocationGroupsTableContainer;
+import org.mobilitydata.gtfsvalidator.table.GtfsShape;
+import org.mobilitydata.gtfsvalidator.table.GtfsShapeTableContainer;
+
+public class MissingShapesFileValidatorTest {
+
+  private static GtfsFeedContainer createFeedContainer(
+      List<GtfsShape> shapes, List<GtfsLocationGroups> locationGroups) {
+    NoticeContainer noticeContainer = new NoticeContainer();
+    return new GtfsFeedContainer(
+        ImmutableList.of(
+            GtfsShapeTableContainer.forEntities(shapes, noticeContainer),
+            GtfsLocationGroupsTableContainer.forEntities(locationGroups, noticeContainer)));
+  }
+
+  private static List<GtfsShape> createShapeTable(int rows) {
+    ArrayList<GtfsShape> shapes = new ArrayList<>();
+    for (int i = 0; i < rows; i++) {
+      if (rows == -1) {
+        return null;
+      }
+      shapes.add(new GtfsShape.Builder().setCsvRowNumber(i + 1).setShapeId("s" + i).build());
+    }
+    return shapes;
+  }
+
+  private static List<GtfsLocationGroups> createLocationGroupsTable(
+      int rows, String groupId, String groupName) {
+    ArrayList<GtfsLocationGroups> locationGroups = new ArrayList<>();
+    for (int i = 0; i < rows; i++) {
+      locationGroups.add(
+          new GtfsLocationGroups.Builder()
+              .setCsvRowNumber(i + 1)
+              .setLocationGroupId(groupId)
+              .setLocationGroupName(groupName)
+              .build());
+    }
+    return locationGroups;
+  }
+
+  @Test
+  public void testShapesFileAndFixedDrtPresent() {
+    List<ValidationNotice> notices =
+        generateNotices(
+            createShapeTable(1),
+            createLocationGroupsTable(1, "b", "testgroup"),
+            createFeedContainer(
+                createShapeTable(1), createLocationGroupsTable(1, "b", "testgroup")));
+    boolean found =
+        notices.stream().anyMatch(notice -> notice instanceof MissingRecommendedFileNotice);
+    assertThat(found).isFalse();
+  }
+
+  @Test
+  public void testShapesFileAndZoneBasedDrtPresent() {
+    List<ValidationNotice> notices =
+        generateNotices(
+            createShapeTable(1),
+            createLocationGroupsTable(1, "d", "t3stgroup"),
+            createFeedContainer(
+                createShapeTable(1), createLocationGroupsTable(1, "d", "t3stgroup")));
+    boolean found =
+        notices.stream().anyMatch(notice -> notice instanceof MissingRecommendedFileNotice);
+    assertThat(found).isFalse();
+  }
+
+  @Test
+  public void testNoShapesFileAndNoDrtPresent() {
+    List<ValidationNotice> notices =
+        generateNotices(
+            createShapeTable(-1),
+            createLocationGroupsTable(0, null, null),
+            createFeedContainer(createShapeTable(-1), createLocationGroupsTable(0, null, null)));
+    long missingRecommendedFileNoticesCount =
+        notices.stream().filter(notice -> notice instanceof MissingRecommendedFileNotice).count();
+    assertThat(missingRecommendedFileNoticesCount).isAtLeast(1);
+  }
+
+  private static List<ValidationNotice> generateNotices(
+      List<GtfsShape> shapes,
+      List<GtfsLocationGroups> locationGroups,
+      GtfsFeedContainer feedContainer) {
+    NoticeContainer noticeContainer = new NoticeContainer();
+    new MissingShapesFileValidator(
+            GtfsShapeTableContainer.forEntities(shapes, noticeContainer),
+            GtfsLocationGroupsTableContainer.forEntities(locationGroups, noticeContainer),
+            feedContainer)
+        .validate(noticeContainer);
+    return noticeContainer.getValidationNotices();
+  }
+}