@GuardedBy("this")
    @Nullable MemoryOutput memory;

    @GuardedBy("this")
    @Nullable File file;

    @GuardedBy("this")
    OutputStream out;

    State(int fileThreshold, boolean resetWhenGarbageCollected) {
      this.fileThreshold = fileThreshold;
      this.resetWhenGarbageCollected = resetWhenGarbageCollected;
      this.memory = new MemoryOutput();
      this.out = memory;
    }