UnreadPdxType getExistingTypeForClass(Class<?> aClass, int typeId) {
    Map<Integer, UnreadPdxType> map = localTypeIdMaps.get(aClass);
    if (map != null) {
      return map.get(typeId);
    } else {
      return null;
    }
  }
Returns the local type that should be used for deserializing blobs of the given typeId for the
given local class. Returns null if no such local type exists.
geode-core/src/main/java/org/apache/geode/pdx/internal/TypeRegistry.java