/// <summary>
/// Returns the next unused filename similar to the current one,by incrementing (i)
/// </summary>
/// <returns></returns>
public yrl GetNextAvailableDerivitive()
{
yrl newfilename = this.Copy();
if (newfilename.FileExists)
{
//This section here just looks for the next unused filname in the form
// oldfilename (1).oldextension
// This way, if the same file is uploaded 5 times it will appear as
// file.txt
// file (1).txt
// file (2).txt
// file (3).txt
// file (4).txt
string minusext = newfilename.Parent.Local +
System.IO.Path.DirectorySeparatorChar +
newfilename.NameWithoutExtension;
for (int i = 1; i < 100; i++)
{
if (!System.IO.File.Exists(minusext + " (" + i.ToString() + ")" + newfilename.Extension))
{
newfilename = new yrl(minusext + " (" + i.ToString() + ")" + newfilename.Extension);
break;
}
}
}
return(newfilename);
}
/// <summary>
/// Creates a deep copy of the yrl
/// </summary>
/// <returns></returns>
public yrl Copy()
{
yrl temp = new yrl();
temp.BaseFile = string.Copy(this.BaseFile);
foreach (string s in QueryString.Keys)
{
string value = QueryString[s];
temp.QueryString.Add(string.Copy(s), string.Copy(value));
}
return(temp);
}
/// <summary>
/// Returns true if the yrl is null or empty (site root)
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
public static bool IsNullOrEmpty(yrl path)
{
if (path == null)
{
return(true);
}
if (path.IsEmpty)
{
return(true);
}
return(false);
}
/// <summary>
/// Creates an instance from a yrl-syntax string (virtual, but without ~/). Use FromString if you're not sure what type of syntax is used.
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
public static yrl FromYrlString(string path)
{
if (path.Length == 0)
{
return(yrl.Root);
}
yrl temp = new yrl();
int firstdelimiter = path.IndexOfAny(new char[] { '?', '&' });
if (firstdelimiter < 0)
{
firstdelimiter = path.Length;
}
if (path.IndexOfAny(new char[] { '/', '\\', '~', ':' }) == 0)
{
return(null);
}
//throw new Exception("The specified path \"" + path + "\" starts with an invalid character! yrl paths cannot begin with any sort of slash, tilde, or colon!");
temp.BaseFile = path.Substring(0, firstdelimiter);
string querystring = "";
if (firstdelimiter < path.Length)
{
querystring = path.Substring(firstdelimiter, path.Length - firstdelimiter);
}
if (querystring.Length > 0)
{
string[] pairs = querystring.Split(new char[] { '?', '&' }, StringSplitOptions.RemoveEmptyEntries);
foreach (string s in pairs)
{
string[] namevalue = s.Split(new char[] { '=' }, StringSplitOptions.RemoveEmptyEntries);
if (namevalue.Length == 2)
{
temp.QueryString[HttpUtility.UrlDecode(namevalue[0])] =
HttpUtility.UrlDecode(namevalue[1]);
}
else
{
//No value, so we set a blank value
//Setting a null value would be confusing, as that is how we determine
//whether a certain paramater exists
temp.QueryString[HttpUtility.UrlDecode(namevalue[0])] = "";
//throw new Exception("The specified path \"" + path + "\" contains a query paramater pair \"" + s + "\" that does not parse!");
}
}
}
return(temp);
}
public yrl(string path)
{
if (path == null)
{
throw new ArgumentNullException("path", "Cannot create a yrl from a null string");
}
yrl temp = FromString(path);
if (temp == null)
{
throw new ArgumentException("The specified path (" + path + ") could not be parsed! It may be outside the bounds of the application, or it may contain an invalid character, such as a tilde in the middle of the path.", "path");
}
this.BaseFile = temp.BaseFile;
this.QueryString = temp.QueryString;
}
/// <summary>
/// Joins two yrls. Querystrings on either are discarded.
/// </summary>
/// <param name="folder"></param>
/// <param name="filenameOrSubdir"></param>
/// <returns></returns>
public static yrl Combine(yrl folder, yrl filenameOrSubdir)
{
return(new yrl(folder.Local + System.IO.Path.DirectorySeparatorChar + filenameOrSubdir.BaseFile.Replace('/', '\\')));
}