/// <summary>
/// Throws <see cref="ApplicationException"/> if <see cref="Change.Path"/> and / or <see cref="Change.OldPath"/>
/// properties have incorrect values.
///
/// The performance of this check is same as <see cref="Directory.Exists"/>
/// </summary>
/// <exception cref="ApplicationException"></exception>
public void ThrowIfIncorrectPath(Change change)
{
if (change.FileSystemWatcher == null)
{
return;
}
lock (_sync)
{
if (!_initialWatchPaths.TryGetValue(change.FileSystemWatcher, out var expectedPath))
{
return;
}
string actualPath = WatcherPathInspector.GetActualPath(change.FileSystemWatcher);
if (PathString.Comparer.Equals(expectedPath, actualPath))
{
return;
}
throw new ApplicationException(new StringBuilder()
.AppendLine("Observed directory was moved. Initial path:")
.AppendLine(expectedPath)
.AppendLine()
.AppendLine("Current path:")
.AppendLine(actualPath)
.ToString());
}
}
private void saveInitialWatchLocation(FileSystemWatcher watcher)
{
string initialPath = WatcherPathInspector.GetActualPath(watcher);
if (String.IsNullOrEmpty(initialPath))
{
throw new ApplicationException("Failed to retrieve actual watcher path");
}
_initialWatchPaths[watcher] = initialPath;
}
/// <summary>
/// Returns false if <see cref="Change.Path"/> and / or <see cref="Change.OldPath"/>
/// properties have incorrect values.
///
/// The performance of this check is same as <see cref="Directory.Exists"/>
/// </summary>
public bool IsPathCorrect(WatchTarget target)
{
lock (_sync)
{
if (!_watchers.TryGetValue(target, out var watcher))
{
return(true);
}
string expectedPath = _initialWatchPaths[watcher];
string actualPath = WatcherPathInspector.GetActualPath(watcher);
return(PathString.Comparer.Equals(expectedPath, actualPath));
}
}