Parse a parking that has no ParentSiteRef

src/main/java/org/entur/netex/loader/parser/SiteFrameParser.java

@@ -165,7 +165,12 @@ private void parseParkings(
     for (JAXBElement<? extends Site_VersionStructure> jaxbParking : parkingList) {
       if (jaxbParking.getValue() instanceof Parking parking) {
         parkings.add(parking);
-        parkingsByStopPlaceId.put(parking.getParentSiteRef().getRef(), parking);
+        if (parking.getParentSiteRef() != null) {
+          parkingsByStopPlaceId.put(
+            parking.getParentSiteRef().getRef(),
+            parking
+          );
+        }
       }
     }
   }

src/test/java/org/entur/netex/loader/parser/SiteFrameParserTest.java

@@ -0,0 +1,51 @@
+package org.entur.netex.loader.parser;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import org.entur.netex.index.impl.NetexEntitiesIndexImpl;
+import org.entur.netex2.model.*;
+import org.junit.jupiter.api.Test;
+
+class SiteFrameParserTest {
+
+  private static final ObjectFactory FACTORY = new ObjectFactory();
+
+  @Test
+  void parkingWithoutParentSiteRefIsIndexed() {
+    Parking withoutParent = new Parking()
+      .withId("NSR:Parking:1")
+      .withVersion("1");
+    Parking withParent = new Parking()
+      .withId("NSR:Parking:2")
+      .withVersion("1")
+      .withParentSiteRef(new SiteRefStructure().withRef("NSR:StopPlace:1"));
+
+    SiteFrameParser parser = new SiteFrameParser();
+    parser.parse(
+      new SiteFrame()
+        .withId("NSR:SiteFrame:1")
+        .withParkings(
+          new ParkingsInFrame_RelStructure()
+            .withParking(
+              FACTORY.createParking(withoutParent),
+              FACTORY.createParking(withParent)
+            )
+        )
+    );
+    NetexEntitiesIndexImpl index = new NetexEntitiesIndexImpl();
+    parser.setResultOnIndex(index);
+
+    assertNotNull(index.getParkingIndex().getLatestVersion("NSR:Parking:1"));
+    assertNotNull(index.getParkingIndex().getLatestVersion("NSR:Parking:2"));
+    assertEquals(1, index.getParkingsByParentSiteRefIndex().size());
+    assertEquals(
+      withParent,
+      index
+        .getParkingsByParentSiteRefIndex()
+        .get("NSR:StopPlace:1")
+        .iterator()
+        .next()
+    );
+  }
+}