public Func <Stream, Stream> GetEncoder(HttpHeaderValueCollection <StringWithQualityHeaderValue> list)
{
if (list != null && list.Count() > 0)
{
var headerValue = list.OrderByDescending(e => e.Quality ?? 1.0D)
.Where(e => !e.Quality.HasValue ||
e.Quality.Value > 0.0D)
.FirstOrDefault(e => supported.Keys
.Contains(e.Value, StringComparer.OrdinalIgnoreCase));
if (headerValue != null)
{
return(GetStreamForSchema(headerValue.Value));
}
if (list.Any(e => e.Value == "*" &&
(!e.Quality.HasValue || e.Quality.Value > 0.0D)))
{
var encoding = supported.Keys.Where(se =>
!list.Any(e =>
e.Value.Equals(se, StringComparison.OrdinalIgnoreCase) &&
e.Quality.HasValue &&
e.Quality.Value == 0.0D))
.FirstOrDefault();
if (encoding != null)
{
return(GetStreamForSchema(encoding));
}
}
if (list.Any(e => e.Value.Equals(IDENTITY, StringComparison.OrdinalIgnoreCase) &&
e.Quality.HasValue && e.Quality.Value == 0.0D))
{
throw new NegotiationFailedException();
}
// Case 4: Client is not willing to accept one of the encodings
// we support and is not willing to accept identity
if (list.Any(e => e.Value == "*" &&
(e.Quality.HasValue || e.Quality.Value == 0.0D)))
{
if (!list.Any(e => e.Value.Equals(IDENTITY, StringComparison.OrdinalIgnoreCase)))
{
throw new NegotiationFailedException();
}
}
}
return(null);
}