public static LinkBuilder Create(LinksFromAttribute attribute, ApiDescription apiDescription)
{
var modelTypeName = attribute.ModelType.Name;
var getters = new List <ILinkPropertyGetter>();
Dictionary <string, Tuple <string, bool> > parameters =
apiDescription.ParameterDescriptions.Where(p => p.Source == ApiParameterSource.FromUri)
.ToDictionary(s => s.Name, s => Tuple.Create("{" + s.Name + "}", IsOptional(s, attribute)), StringComparer.OrdinalIgnoreCase);
int questionMark = apiDescription.RelativePath.IndexOf('?');
string path;
string queryString;
string[] queryStringSegments;
if (questionMark > -1)
{
path = apiDescription.RelativePath.Substring(0, questionMark);
queryString = apiDescription.RelativePath.Substring(questionMark + 1);
queryStringSegments = queryString.Split('&');
}
else
{
path = apiDescription.RelativePath;
queryString = string.Empty;
queryStringSegments = new string[0];
}
foreach (var parameterDescription in apiDescription.ParameterDescriptions.Where(p => p.Source == ApiParameterSource.FromUri))
{
var property =
attribute.ModelType.GetProperties().FirstOrDefault(p => p.Name.Equals(parameterDescription.Name, StringComparison.OrdinalIgnoreCase));
var regex = new Regex(@"\{\*?" + parameterDescription.Name + @"[:\?]?.*?\}");
if (property != null)
{
bool isOptional = IsOptional(parameterDescription, attribute);
if (regex.IsMatch(path))
{
getters.Add(new PathPropertyGetter(regex, property, isOptional));
}
else if (regex.IsMatch(queryString))
{
var segment = queryStringSegments.FirstOrDefault(regex.IsMatch);
getters.Add(new QueryStringPropertyGetter(regex, segment, property, isOptional));
}
}
else
{
if (regex.IsMatch(path))
{
getters.Add(new NullPropertyGetter(parameterDescription.Name));
}
}
}
if (getters.Count(g => !g.Optional) != parameters.Count(p => !p.Value.Item2))
{
return(null);
}
return(new LinkBuilder(attribute.ModelType, attribute.Rel, getters.ToArray(), apiDescription.Route.RouteTemplate));
}
private static bool IsOptional(ApiParameterDescription parameterDescription, LinksFromAttribute attribute)
{
return((parameterDescription.ParameterDescriptor != null && parameterDescription.ParameterDescriptor.IsOptional) &&
!attribute.IsRequired(parameterDescription.Name));
}