Suppress some Checker Framework warnings and add TODOs (issue #359).

Fixing these warnings will require significant refactoring.

1 files changed, 7 insertions, 1 deletions

diff --git a/contrib/zpages/src/main/java/io/opencensus/contrib/zpages/TracezZPageHandler.java b/contrib/zpages/src/main/java/io/opencensus/contrib/zpages/TracezZPageHandler.java
index a1f3545b..7a42c2c7 100644
--- a/contrib/zpages/src/main/java/io/opencensus/contrib/zpages/TracezZPageHandler.java
+++ b/contrib/zpages/src/main/java/io/opencensus/contrib/zpages/TracezZPageHandler.java
@@ -370,7 +370,7 @@ final class TracezZPageHandler extends ZPageHandler {
               .escape(
                   event.getEvent() instanceof Annotation
                       ? renderAnnotation((Annotation) event.getEvent())
-                      : renderNetworkEvents((NetworkEvent) event.getEvent())));
+                      : renderNetworkEvents((NetworkEvent) castNonNull(event.getEvent()))));
 
       lastTimestampNanos = event.getTimestamp();
     }
@@ -383,6 +383,12 @@ final class TracezZPageHandler extends ZPageHandler {
         "", htmlEscaper().escape(renderAttributes(span.getAttributes().getAttributeMap())));
   }
 
+  // TODO(sebright): Remove this method.
+  @SuppressWarnings("nullness")
+  private static <T> T castNonNull(@Nullable T arg) {
+    return arg;
+  }
+
   // Emits the summary table with links to all samples.
   private void emitSummaryTable(PrintWriter out, Formatter formatter)
       throws UnsupportedEncodingException {