Issue #329 - clean up logic in FHIRResource.addLinks

Signed-off-by: John T.E. Timm <johntimm@us.ibm.com>

Author: JohnTimm

fhir-server/src/main/java/com/ibm/fhir/server/resources/FHIRResource.java

@@ -3891,11 +3891,9 @@ private Bundle addLinks(FHIRPagingContext context, Bundle bundle, String request
                 Bundle.Link.builder().relation(string("self")).url(Url.of(selfUri)).build();
         bundleBuilder.link(selfLink);
 
-        // If for search with _summary=count, then don't add previous and next links.
-        if (!(context instanceof FHIRSearchContext 
-                && ((FHIRSearchContext) context).getSummaryParameter() != null
-                && ((FHIRSearchContext) context).getSummaryParameter().equals(SummaryValueSet.COUNT))
-                && ((FHIRSearchContext) context).getPageSize() > 0) {
+        // If for search with _summary=count or pageSize == 0, then don't add previous and next links.
+        SummaryValueSet summaryParameter = (context instanceof FHIRSearchContext) ? ((FHIRSearchContext) context).getSummaryParameter() : null;
+        if (!SummaryValueSet.COUNT.equals(summaryParameter) && context.getPageSize() > 0) {
             int nextPageNumber = context.getPageNumber() + 1;
             if (nextPageNumber <= context.getLastPageNumber()) {