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private Object myState = null;

// Sets some internal state in the library
void setfilesetState(Object state) {
  myState = state;
}

// Performs some action using the file passed earlier
void useState() {
  // Perform some action here
}

private Object myState = null;

// Sets some internal state in the library
void setfilesetState(Object state) {
  if (state == null) {
    // Handle null state
  }

  // Defensive copy here when state is mutable

  if (isInvalidState(state)) {
    // Handle invalid state
  }
  myState = state;
}

// Performs some action using the state passed earlier
void useState() {
  if (myState == null) {
    // Handle no state (e.g. null) condition
  }
  // ...
}