What does this code do? Are there any bugs? does the code
require refactoring?
static void
Cache(WindowsIdentity identity, FileInfo Source, FileInfo
Target, Dictionary<string, ReplaceContents>
rc)
{
lock
(lockThis)
{
List<string> children = null;
string
text = null;
byte[]
data = null;
DateTime?
Source_LastWriteTime = null;
// Get target
last-modification time
// Note:
.Exists returns false for Directories, hence the Attribute checking
// .Attributes returns -1 on error (such as
doesnt exist). Perhaps I should simply check this value? (would need further
testing).
bool
Target_Exists = Target.Exists || (((int)Target.Attributes
!= -1) && ((Target.Attributes & FileAttributes.Directory)
== FileAttributes.Directory));
DateTime?
Target_LastWriteTime = null;
if
(Target_Exists)
Target_LastWriteTime =
Target.LastWriteTime;
//
Read/Enumerate Source using impersonation
using
(identity.Impersonate())
{
try
{
if
(((int)Source.Attributes != -1) &&
((Source.Attributes & FileAttributes.Directory)
== FileAttributes.Directory))
{
children = new List<string>();
foreach
(var child in Directory.EnumerateFileSystemEntries(Source.FullName))
children.Add(new FileInfo(child).Name);
}
else
if (Source.Exists &&
((Target_LastWriteTime == null) ||
(Target_LastWriteTime.Value < Source.LastWriteTime)))
{
Source_LastWriteTime =
Source.LastWriteTime;
if
(rc.ContainsKey(Source.Extension))
text = File.ReadAllText(Source.FullName);
else
data = File.ReadAllBytes(Source.FullName);
}
}
catch
(Exception ex)
{
//
Only swallow error if target already exists (assume cache has current version
of file/folder)
if
(Target_Exists)
return;
else
throw;
}
}
// Source is
a Directory?
if
(children != null)
{
if
(Target.Exists)
Target.Delete();
else
if (((int)Target.Attributes
== -1) || ((Target.Attributes & FileAttributes.Directory)
!= FileAttributes.Directory))
Directory.CreateDirectory(Target.FullName);
foreach
(var child in
children)
Cache(identity, new FileInfo(Path.Combine(Source.FullName, child)), new FileInfo(Path.Combine(Target.FullName, child)), rc);
}
// Source is
a text file with a matching delegate for replacing its contents
else if (text != null)
{
Directory.CreateDirectory(Target.DirectoryName);
text =
rc[Source.Extension](Source.FullName, Target.FullName, text);
File.WriteAllText(Target.FullName,
text);
Target.LastWriteTime =
Source_LastWriteTime.Value;
}
// Source is
a file
else if (data != null)
{
Directory.CreateDirectory(Target.DirectoryName);
File.WriteAllBytes(Target.FullName,
data);
Target.LastWriteTime =
Source_LastWriteTime.Value;
}
}
}
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