private IEnumerable <FileSystemItem> GetFileSystemEnumerable(IEnumerable <FileSystemItem> entities)
{
OnStart(null);
var fileSystemItems = entities.ToList();
var filteredEntities = fileSystemItems.Where(_filter).ToList();
foreach (var entity in fileSystemItems)
{
var isFile = entity.Type == FileSystemItemType.File;
var args = new SystemVisitorEventArgs
{
IsStop = false,
IsSkip = false,
FoundItem = entity
};
if (isFile)
{
OnFileFound(args);
}
else
{
OnDirectoryFound(args);
}
if (!filteredEntities.Contains(entity))
{
continue;
}
if (isFile)
{
OnFilteredFileFound(args);
}
else
{
OnFilteredDirectoryFound(args);
}
if (_isStop)
{
yield break;
}
if (!_isSkip)
{
yield return(entity);
}
}
OnFinish(null);
}
protected virtual void OnFilteredDirectoryFound(SystemVisitorEventArgs e)
{
FilteredDirectoryFound?.Invoke(this, e);
_isStop = e.IsStop;
_isSkip = e.IsSkip;
}
protected virtual void OnDirectoryFound(SystemVisitorEventArgs e) => DirectoryFound?.Invoke(this, e);
protected virtual void OnFileFound(SystemVisitorEventArgs e) => FileFound?.Invoke(this, e);
protected virtual void OnFinish(SystemVisitorEventArgs e) => Finish?.Invoke(this, e);
protected virtual void OnStart(SystemVisitorEventArgs e) => Start?.Invoke(this, e);