Default registration parameter to zero UUID

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Author: Copilot

samples/xapi-server/src/main/java/dev/learning/xapi/samples/xapiserver/StateController.java

@@ -39,6 +39,8 @@
 @RequestMapping(value = "/xapi/activities/state")
 public class StateController {
 
+  private static final UUID ZERO_UUID = new UUID(0L, 0L);
+
   Logger log = LoggerFactory.getLogger(StateController.class);
 
   private final StateService stateService;
@@ -64,7 +66,7 @@ public StateController(StateService stateService) {
   public ResponseEntity<String> getState(@RequestParam(required = true) String activityId,
       @Valid @RequestParam(required = true) Agent agent,
       @RequestParam(required = true) String stateId,
-      @RequestParam(required = false) UUID registration) {
+      @RequestParam(defaultValue = "00000000-0000-0000-0000-000000000000") UUID registration) {
 
     log.debug("GET state");
 
@@ -95,7 +97,7 @@ public ResponseEntity<String> getState(@RequestParam(required = true) String act
   public ResponseEntity<List<String>> getStateIds(
       @RequestParam(required = true) String activityId,
       @Valid @RequestParam(required = true) Agent agent,
-      @RequestParam(required = false) UUID registration) {
+      @RequestParam(defaultValue = "00000000-0000-0000-0000-000000000000") UUID registration) {
 
     log.debug("GET state ids");
 
@@ -122,7 +124,7 @@ public ResponseEntity<List<String>> getStateIds(
   public ResponseEntity<Void> putState(@RequestParam(required = true) String activityId,
       @Valid @RequestParam(required = true) Agent agent,
       @RequestParam(required = true) String stateId,
-      @RequestParam(required = false) UUID registration,
+      @RequestParam(defaultValue = "00000000-0000-0000-0000-000000000000") UUID registration,
       @RequestHeader(value = HttpHeaders.CONTENT_TYPE,
           defaultValue = MediaType.APPLICATION_JSON_VALUE) String contentType,
       @RequestBody String stateDocument) {
@@ -152,7 +154,7 @@ public ResponseEntity<Void> putState(@RequestParam(required = true) String activ
   public ResponseEntity<Void> postState(@RequestParam(required = true) String activityId,
       @Valid @RequestParam(required = true) Agent agent,
       @RequestParam(required = true) String stateId,
-      @RequestParam(required = false) UUID registration,
+      @RequestParam(defaultValue = "00000000-0000-0000-0000-000000000000") UUID registration,
       @RequestHeader(value = HttpHeaders.CONTENT_TYPE,
           defaultValue = MediaType.APPLICATION_JSON_VALUE) String contentType,
       @RequestBody String stateDocument) {
@@ -181,7 +183,7 @@ public ResponseEntity<Void> postState(@RequestParam(required = true) String acti
   public ResponseEntity<Void> deleteState(@RequestParam(required = true) String activityId,
       @Valid @RequestParam(required = true) Agent agent,
       @RequestParam(required = true) String stateId,
-      @RequestParam(required = false) UUID registration) {
+      @RequestParam(defaultValue = "00000000-0000-0000-0000-000000000000") UUID registration) {
 
     log.debug("DELETE state");
 
@@ -205,7 +207,7 @@ public ResponseEntity<Void> deleteState(@RequestParam(required = true) String ac
   @DeleteMapping(params = {"activityId", "agent", "!stateId"})
   public ResponseEntity<Void> deleteStates(@RequestParam(required = true) String activityId,
       @Valid @RequestParam(required = true) Agent agent,
-      @RequestParam(required = false) UUID registration) {
+      @RequestParam(defaultValue = "00000000-0000-0000-0000-000000000000") UUID registration) {
 
     log.debug("DELETE states");