private ExportedNameCache getExportedNameCache() {
    ExportedNameCache cache = myExportedNameCache.get();
    final long modificationStamp = getModificationStamp();
    if (cache != null && modificationStamp != cache.getModificationStamp()) {
      myExportedNameCache.clear();
      cache = null;
    }
    if (cache == null) {
      cache = new ExportedNameCache(modificationStamp);
      myExportedNameCache = new SoftReference<>(cache);
    }
    return cache;
  }
private ExportedNameCache getExportedNameCache()