internal static FilesystemEntry TryFindFilesystemEntryInDirectory(DirectoryEntryBase parentDirectory, string childName)
{
if (parentDirectory == null)
{
throw new ArgumentNullException(nameof(parentDirectory));
}
if (String.IsNullOrEmpty(childName))
{
throw new ArgumentException();
}
return(parentDirectory
.EnumerateChildFilesystemEntries()
.FirstOrDefault(entry => FilesystemEntryNamesEquals(entry.Name, childName)));
}
/// <summary>
/// Finds filesystem entry representing given path. If no such entry exists, returns null.
/// </summary>
internal static FilesystemEntry TryFindFilesystemEntry(string path, DirectoryEntryBase rootDirectory)
{
var pathNames = SplitPath(path);
var currentDirectory = rootDirectory;
FileEntryBase file = null;
foreach (var pathName in pathNames)
{
if (currentDirectory == null)
{
return(null);
}
if (file != null)
{
//File cannot contain children
return(null);
}
var childEntry = TryFindFilesystemEntryInDirectory(currentDirectory, pathName);
if (childEntry is DirectoryEntryBase childDirectory)
{
currentDirectory = childDirectory;
}
else if (childEntry is FileEntryBase f)
{
file = f;
}
else
{
return(null);
}
}
if (file != null)
{
return(file);
}
else
{
return(currentDirectory);
}
}
