squash! [untested, interim] implement member-of and member-of/member-…

…of endpoints

service/src/main/java/gov/nasa/pds/api/registry/controllers/ProductsController.java

@@ -546,4 +546,41 @@ public ResponseEntity<Object> productMemberOf(
     }
   }
 
+  @Override
+  public ResponseEntity<Object> productMemberOfOf(
+          String identifier, List<String> fields, Integer limit, List<String> sort, List<String> searchAfter)
+          throws NotFoundException, UnhandledException, SortSearchAfterMismatchException, MiscellaneousBadRequestException,
+          AcceptFormatNotSupportedException{
+
+    try{
+      PdsProductIdentifier pdsIdentifier = PdsProductIdentifier.fromString(identifier);
+      PdsProductClasses productClass = resolveProductClass(pdsIdentifier);
+
+      List<PdsLidVid> parentIds;
+      if (productClass.isBasicProduct()) {
+        parentIds = resolveLidVidsFromProductField(pdsIdentifier, "ops:Provenance/ops:parent_bundle_identifier");
+      } else {
+//        TODO: replace with enumeration of acceptable values later
+        throw new MiscellaneousBadRequestException("productMembersOf endpoint is not valid for products with Product_Class '" +
+                PdsProductClasses.Product_Bundle + "' or '" + PdsProductClasses.Product_Collection + "' (got '" + productClass + "')");
+      }
+
+      SearchRequest searchRequest = new RegistrySearchRequestBuilder(this.connectionContext)
+              .matchFieldAnyOfIdentifiers("_id", parentIds)
+              .fieldsFromStrings(fields)
+              .paginate(limit, sort, searchAfter)
+              .build();
+
+      SearchResponse<HashMap> searchResponse =
+              this.openSearchClient.search(searchRequest, HashMap.class);
+
+      RawMultipleProductResponse products = new RawMultipleProductResponse(searchResponse);
+
+      return formatMultipleProducts(products, fields);
+
+    } catch (IOException | OpenSearchException e) {
+      throw new UnhandledException(e);
+    }
+  }
+
 }