/// <summary>
/// Internal method to initially create and then access the cached version of the file entry list
/// <param name="startUsn">USN of first entry to consider</param>
/// </summary>
private IEnumerable <Record> GetRecords(long startUsn)
{
const Win32USN.USNReason InclusionFlags = Win32USN.USNReason.USN_REASON_ANY
& ~(Win32USN.USNReason.USN_REASON_INDEXABLE_CHANGE | Win32USN.USNReason.USN_REASON_COMPRESSION_CHANGE |
Win32USN.USNReason.USN_REASON_ENCRYPTION_CHANGE | Win32USN.USNReason.USN_REASON_EA_CHANGE |
Win32USN.USNReason.USN_REASON_REPARSE_POINT_CHANGE | Win32USN.USNReason.USN_REASON_CLOSE);
if (m_entryList == null || m_startUsn != startUsn)
{
m_startUsn = startUsn;
m_entryList = ResolveFullPaths(GetRawRecords(startUsn, rec => (rec.UsnRecord.Reason & InclusionFlags) != 0));
}
return(m_entryList);
}
private static ChangeReason MapChangeReason(Win32USN.USNReason reason)
{
if (reason.HasFlag(Win32USN.USNReason.USN_REASON_FILE_CREATE))
{
return(ChangeReason.Created);
}
if (reason.HasFlag(Win32USN.USNReason.USN_REASON_FILE_DELETE))
{
return(ChangeReason.Deleted);
}
if (reason.HasFlag(Win32USN.USNReason.USN_REASON_RENAME_OLD_NAME))
{
return(ChangeReason.RenamedFrom);
}
if (reason.HasFlag(Win32USN.USNReason.USN_REASON_RENAME_NEW_NAME))
{
return(ChangeReason.RenamedTo);
}
return(ChangeReason.Modified);
}
