/// <summary>
/// Ctor
/// </summary>
/// <param name="writers">inject with all possible writers</param>
public DataWriterProvider(IEnumerable <IDataWriter> writers)
{
if (writers != null)
{
foreach (IDataWriter writer in writers)
{
if (this.DefaultWriter == null)
{
// TODO: decide less arbitrary way to choose default
// without hardcoding value into IDataWriter
this.DefaultWriter = writer;
}
if (!String.IsNullOrEmpty(writer.ContentType))
{
this.WritersByMime[writer.ContentType] = writer;
}
if (!String.IsNullOrEmpty(writer.ContentType))
{
string ext = DataWriterProvider.NormalizeExtension(writer.FileExtension);
this.WritersByExt[ext] = writer;
}
}
}
}
/// <summary>
///
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
public static string ParseMediaType(string type)
{
foreach (string mime in DataWriterProvider.SplitTrim(type, ';'))
{
// only return first part
return(mime);
}
// if no parts then was empty
return(String.Empty);
}
public IDataWriter Find(string extension)
{
extension = DataWriterProvider.NormalizeExtension(extension);
if (this.WritersByExt.ContainsKey(extension))
{
return(WritersByExt[extension]);
}
return(null);
}
/// <summary>
/// Finds an IDataReader by content-type header
/// </summary>
/// <param name="contentTypeHeader"></param>
/// <returns></returns>
public IDataReader Find(string contentTypeHeader)
{
string type = DataWriterProvider.ParseMediaType(contentTypeHeader);
if (this.ReadersByMime.ContainsKey(type))
{
return(ReadersByMime[type]);
}
return(null);
}
public IDataWriter Find(string acceptHeader, string contentTypeHeader)
{
foreach (string type in DataWriterProvider.ParseHeaders(acceptHeader, contentTypeHeader))
{
if (this.WritersByMime.ContainsKey(type))
{
return(WritersByMime[type]);
}
}
return(null);
}
/// <summary>
/// Parses HTTP headers for Media-Types
/// </summary>
/// <param name="accept">HTTP Accept header</param>
/// <param name="contentType">HTTP Content-Type header</param>
/// <returns>sequence of Media-Types</returns>
/// <remarks>
/// http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
/// </remarks>
public static IEnumerable <string> ParseHeaders(string accept, string contentType)
{
string mime;
// check for a matching accept type
foreach (string type in DataWriterProvider.SplitTrim(accept, ','))
{
mime = DataWriterProvider.ParseMediaType(type);
if (!String.IsNullOrEmpty(mime))
{
yield return(mime);
}
}
// fallback on content-type
mime = DataWriterProvider.ParseMediaType(contentType);
if (!String.IsNullOrEmpty(mime))
{
yield return(mime);
}
}