public Queue<WatcherEvent> GetChangeQueue()
{
lock (changeLock)
{
Queue<WatcherEvent> changeQueue = new Queue<WatcherEvent>();
int changeListCount = changeList.Count;
for (int i = 0; i < changeListCount; i++)
{
WatcherEvent watcherEvent = changeList[i];
FileSystemEventArgs change = watcherEvent.GetFileSystemEventArgs();
string fileName = System.IO.Path.GetFileName(change.FullPath);
string dirName = System.IO.Path.GetDirectoryName(change.FullPath);
bool redundantChange = false;
if (change.ChangeType == WatcherChangeTypes.Deleted)
{
//Detect a file/folder move...
FileSystemEventArgs nextChange = ((i + 1) < changeListCount) ? changeList[i + 1].GetFileSystemEventArgs() : null;
if (nextChange != null)
{
string nextFileName = System.IO.Path.GetFileName(nextChange.FullPath);
string nextDirName = System.IO.Path.GetDirectoryName(nextChange.FullPath);
if (nextChange.ChangeType == WatcherChangeTypes.Created &&
nextFileName.Equals(fileName) && !nextDirName.Equals(dirName))
{
//Move detected...
change = new MovedEventArgs(WatcherChangeTypes.Renamed, dirName, nextDirName, fileName);
++i; //Skip nextChange
}
}
}
else if (change.ChangeType == WatcherChangeTypes.Changed)
{
//Detect redundant changes...
for (int j = i - 1; j >= 0; j--)
{
//Iterate backwards through the list of changes, find the most recent operation on this specific file
if (change.FullPath.Equals(changeList[j].GetFileSystemEventArgs().FullPath))
{
//If the most recent operation is a created or changed operation this operation is redundant
if (changeList[j].GetFileSystemEventArgs().ChangeType == WatcherChangeTypes.Created ||
changeList[j].GetFileSystemEventArgs().ChangeType == WatcherChangeTypes.Changed)
{
redundantChange = true;
}
break;
}
}
}
if (redundantChange)
{
Logger.DebugFormat("Local file change {0} discarded because redundant", change.ChangeType);
}
else
{
changeQueue.Enqueue(watcherEvent);
}
}
return changeQueue;
}
}
