code: public Set<SourceSinkInfo> getSourceSinkInfoSet(Location location) {
          Set<SourceSinkInfo> result = sourceSinkMap.get(location);
          return result != null ? result : Collections.<SourceSinkInfo> emptySet();
      }
docs: Get the set of SourceSinkInfo objects representing sources/sinks at a
  given Location.
  
  @param location
  a Location
  @return Set of SourceSinkInfo objects representing sources/sinks at the
  Location