/// <summary>
/// 访问者模式相关
/// </summary>
/// <param name="visitor"></param>
public void Accept(IFileVisitor visitor)
{
foreach (var item in this._childList)
{
item.Accept(visitor);
}
visitor.Visit(this);
}
/// <summary>
/// Walk through a directory tree start with a root file, and performs <see cref="IFileVisitor.Visit"/> on each walked file
/// </summary>
/// <param name="fileSystemInfo">the root file</param>
/// <param name="visitor">a visitor pattern</param>
/// <exception cref="DirectoryNotFoundException"></exception>
/// <exception cref="SecurityException"></exception>
/// <exception cref="UnauthorizedAccessException"></exception>
public static void WalkFileTree(this FileSystemInfo fileSystemInfo, IFileVisitor visitor)
{
switch (fileSystemInfo)
{
case FileInfo file:
visitor.Visit(file);
return;
case DirectoryInfo directoryInfo:
{
// walk thru directories
var dirRemains = new Stack <DirectoryInfo>();
if (!directoryInfo.Exists)
{
throw new DirectoryNotFoundException(directoryInfo.FullName);
}
dirRemains.Push(directoryInfo);
while (dirRemains.Any())
{
var toWalk = dirRemains.Pop();
foreach (var fileInfo in toWalk.GetFiles())
{
visitor.Visit(fileInfo);
}
foreach (var subDirectory in toWalk.GetDirectories())
{
dirRemains.Push(subDirectory);
}
}
return;
}
default:
throw new ArgumentException($"parameter {nameof(fileSystemInfo)} must be one of {{{nameof(FileInfo)}, {nameof(DirectoryInfo)}}}");
}
}
/// <summary>
/// 访问者模式相关
/// </summary>
/// <param name="visitor"></param>
public void Accept(IFileVisitor visitor)
{
visitor.Visit(this);
}