public TokenizedLink CreateLink(Func<string, object> substitution, bool removeIfNull = false)
{
var newLink = new TokenizedLink(Rel, Href);
UpdateHref(newLink, substitution, removeIfNull);
return newLink;
}
private static void UpdateHref(TokenizedLink link, Func<string, object> substitution, bool removeIfNull)
{
var subName = substitution.Method.GetParameters()[0].Name.Trim('_');
var token = string.Format("{{{0}}}", subName);
if (PositionInHref(token, link) <= -1) return;
var val = substitution(null);
var hasVal = val != null;
if (hasVal)
{
link.Href = link.CreateUri(substitution).ToString();
return;
}
if (!removeIfNull) return;
if (!IsQuerystring(token, link))
link.Href = link.Href.Replace(token + HrefSlash, string.Empty);
else
{
//remove querystring pairs if remove is true
if (string.IsNullOrWhiteSpace(link._hrefQueryString))
return;
var queryVals =
link._hrefQueryString.Split(new[] {HrefQueryStringStart, HrefQueryStringAppend},
StringSplitOptions.RemoveEmptyEntries).ToList();
queryVals.RemoveAll(v => v.Contains(token));
var newQueryVals = string.Join(HrefQueryStringAppend, queryVals);
link.Href = link.Href.Replace(link._hrefQueryString, string.Empty);
if (!string.IsNullOrWhiteSpace(newQueryVals))
link.Href = link.Href + HrefQueryStringStart + newQueryVals;
}
}
private static int PositionInHref(string searchFor, TokenizedLink link)
{
var origHref = link._origHref;
return PositionIn(searchFor, origHref);
}
private static bool IsQuerystring(string token, TokenizedLink link)
{
var hrefQueryStringStartPosition = link._hrefQueryStringStartPosition;
if (hrefQueryStringStartPosition < 0) return false;
return PositionInHref(token, link) > hrefQueryStringStartPosition;
}
public TokenizedLink TemplateWithoutQuerystring()
{
var newLink = new TokenizedLink(Rel, _origHref.Replace(_hrefQueryString, string.Empty));
return newLink;
}