/// <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;
}