private void EnsureInitialized()
{
try
{
_entries = new DirectoryInfo(_directory)
.EnumerateFileSystemInfos()
.Where(info => !FileSystemInfoHelper.IsExcluded(info, _filters))
.Select <FileSystemInfo, IFileInfo>(info =>
{
if (info is FileInfo file)
{
return(new PhysicalFileInfo(file));
}
else if (info is DirectoryInfo dir)
{
return(new PhysicalDirectoryInfo(dir));
}
// shouldn't happen unless BCL introduces new implementation of base type
throw new InvalidOperationException("Unexpected type of FileSystemInfo");
});
}
catch (Exception ex) when(ex is DirectoryNotFoundException || ex is IOException)
{
_entries = Enumerable.Empty <IFileInfo>();
}
}
private void OnFileSystemEntryChange(string fullPath)
{
try
{
var fileSystemInfo = new FileInfo(fullPath);
if (FileSystemInfoHelper.IsExcluded(fileSystemInfo, _filters))
{
return;
}
var relativePath = fullPath.Substring(_root.Length);
ReportChangeForMatchedEntries(relativePath);
}
catch (Exception ex) when(
ex is IOException ||
ex is SecurityException ||
ex is UnauthorizedAccessException)
{
// Swallow the exception.
}
}
/// <summary>
/// Locate a file at the given path by directly mapping path segments to physical directories.
/// </summary>
/// <param name="subpath">A path under the root directory</param>
/// <returns>The file information. Caller must check <see cref="IFileInfo.Exists"/> property. </returns>
public IFileInfo GetFileInfo(string subpath)
{
subpath = AdjustSubpath(subpath);
if (string.IsNullOrEmpty(subpath) || PathUtils.HasInvalidPathChars(subpath))
{
return(new NotFoundFileInfo(subpath));
}
// Relative paths starting with leading slashes are okay
subpath = subpath.TrimStart(PathSeparators);
// Absolute paths not permitted.
if (Path.IsPathRooted(subpath))
{
return(new NotFoundFileInfo(subpath));
}
var fullPath = GetFullPath(subpath);
if (fullPath == null)
{
return(new NotFoundFileInfo(subpath));
}
var fileInfo = new FileInfo(fullPath);
if (FileSystemInfoHelper.IsExcluded(fileInfo, _filters))
{
return(new NotFoundFileInfo(subpath));
}
var info = new PhysicalFileInfo(fileInfo);
return(info);
}
