/// <summary>Returns true if the provided input stream is an FSInputStream and /// is a clone, that is it does not own its underlying file descriptor. /// </summary> public static bool IsFSInputStreamClone(InputStream is_Renamed) { if (isFSInputStream(is_Renamed)) { return ((FSInputStream) is_Renamed).isClone; } else { return false; } }
/// <summary>Given an instance of FSDirectory.FSInputStream, this method returns /// true if the underlying file descriptor is valid, and false otherwise. /// This can be used to determine if the OS file has been closed. /// The descriptor becomes invalid when the non-clone instance of the /// FSInputStream that owns this descriptor is closed. However, the /// descriptor may possibly become invalid in other ways as well. /// </summary> public static bool IsFSInputStreamOpen(InputStream is_Renamed) { if (isFSInputStream(is_Renamed)) { FSInputStream fis = (FSInputStream) is_Renamed; return fis.IsFDValid(); } else { return false; } }
/// <summary>Returns true if the instance of the provided input stream is actually /// an FSInputStream. /// </summary> public static bool isFSInputStream(InputStream is_Renamed) { return is_Renamed is FSInputStream; }