public TemplatedPathRoller(string pathTemplate)
{
if (pathTemplate == null)
{
throw new ArgumentNullException(nameof(pathTemplate));
}
var directory = Path.GetDirectoryName(pathTemplate);
if (string.IsNullOrEmpty(directory))
{
directory = Directory.GetCurrentDirectory();
}
Specifier directorySpecifier;
if (Specifier.TryGetSpecifier(directory, out directorySpecifier))
{
throw new ArgumentException($"The {directorySpecifier.Token} specifier cannot form part of the directory name.");
}
directory = Path.GetFullPath(directory);
var filenameTemplate = Path.GetFileName(pathTemplate);
if (!Specifier.TryGetSpecifier(filenameTemplate, out _specifier))
{
_specifier = Specifier.Date;
filenameTemplate = Path.GetFileNameWithoutExtension(filenameTemplate) + DefaultSeparator +
_specifier.Token + Path.GetExtension(filenameTemplate);
}
var indexOfSpecifier = filenameTemplate.IndexOf(_specifier.Token, StringComparison.Ordinal);
var prefix = filenameTemplate.Substring(0, indexOfSpecifier);
var suffix = filenameTemplate.Substring(indexOfSpecifier + _specifier.Token.Length);
_filenameMatcher = new Regex(
"^" +
Regex.Escape(prefix) +
"(?<" + SpecifierMatchGroup + ">\\d{" + _specifier.Format.Length + "})" +
"(?<" + SequenceNumberMatchGroup + ">_[0-9]{3,}){0,1}" +
Regex.Escape(suffix) +
"$");
DirectorySearchPattern = filenameTemplate.Replace(_specifier.Token, "*");
LogFileDirectory = directory;
_pathTemplate = Path.Combine(LogFileDirectory, filenameTemplate);
}
public static bool TryGetSpecifier(string pathTemplate, out Specifier specifier)
{
if (pathTemplate == null)
{
throw new ArgumentNullException(nameof(pathTemplate));
}
var specifiers = new[] { HalfHour, Hour, Date }.Where(s => pathTemplate.Contains(s.Token)).ToArray();
if (specifiers.Length > 1)
{
throw new ArgumentException("Only one interval specifier can be used in a rolling log file path.", nameof(pathTemplate));
}
specifier = specifiers.FirstOrDefault();
return(specifier != null);
}