/// <summary>
/// Creates a WriterValidator instance and binds it to settings.
/// </summary>
/// <param name="settings">The ODataMessageWriterSettings instance to bind to.</param>
internal WriterValidator(ODataMessageWriterSettings settings)
{
this.settings = settings;
}
/// <summary> /// Creates an instance of the output context for this format. /// </summary> /// <param name="messageInfo">The context information for the message.</param> /// <param name="messageWriterSettings">Configuration settings of the OData writer.</param> /// <returns>The newly created output context.</returns> public abstract ODataOutputContext CreateOutputContext(ODataMessageInfo messageInfo, ODataMessageWriterSettings messageWriterSettings);
/// <summary>
/// Given the Accept and the Accept-Charset headers of the request message computes the media type, encoding and <see cref="ODataFormat"/>
/// to be used for the response message.
/// </summary>
/// <param name="settings">The message writer settings to use for serializing the response payload.</param>
/// <param name="payloadKind">The kind of payload to be serialized as part of the response message.</param>
/// <param name="mediaTypeResolver">The media type resolver to use when interpreting the content type.</param>
/// <param name="mediaType">The media type to be used in the response message.</param>
/// <param name="encoding">The encoding to be used in the response message.</param>
/// <returns>The <see cref="ODataFormat"/> used when serializing the response.</returns>
internal static ODataFormat GetContentTypeFromSettings(
ODataMessageWriterSettings settings,
ODataPayloadKind payloadKind,
ODataMediaTypeResolver mediaTypeResolver,
out ODataMediaType mediaType,
out Encoding encoding)
{
Debug.Assert(settings != null, "settings != null");
// compute format, media type and encoding
ODataFormat format;
// get the supported and default media types for the specified payload kind
IList <ODataMediaTypeFormat> supportedMediaTypes = mediaTypeResolver.GetMediaTypeFormats(payloadKind).ToList();
if (supportedMediaTypes == null || supportedMediaTypes.Count == 0)
{
throw new ODataContentTypeException(Strings.MediaTypeUtils_DidNotFindMatchingMediaType(null, settings.AcceptableMediaTypes));
}
if (settings.UseFormat == true)
{
Debug.Assert(settings.AcceptableMediaTypes == null, "settings.AcceptableMediaTypes == null");
Debug.Assert(settings.AcceptableCharsets == null, "settings.AcceptableCharsets == null");
mediaType = GetDefaultMediaType(supportedMediaTypes, settings.Format, out format);
// NOTE the default media types don't have any parameters (in particular no 'charset' parameters)
encoding = mediaType.SelectEncoding();
}
else
{
// parse the accept header into its parts
IList <KeyValuePair <ODataMediaType, string> > specifiedTypes = HttpUtils.MediaTypesFromString(settings.AcceptableMediaTypes);
// Starting in V3 we replace all occurrences of application/json with application/json;odata.metadata=minimal
// before handing the acceptable media types to the conneg code. This is necessary because for an accept
// header 'application/json, we want to the result to be 'application/json;odata.metadata=minimal'
ConvertApplicationJsonInAcceptableMediaTypes(specifiedTypes);
ODataMediaTypeFormat selectedMediaTypeWithFormat;
string specifiedCharset = null;
if (specifiedTypes == null || specifiedTypes.Count == 0)
{
selectedMediaTypeWithFormat = supportedMediaTypes[0];
}
else
{
// match the specified media types against the supported/default ones and get the format
MediaTypeMatchInfo matchInfo = MatchMediaTypes(specifiedTypes.Select(kvp => kvp.Key), supportedMediaTypes.Select(smt => smt.MediaType).ToArray());
if (matchInfo == null)
{
// We're calling the ToArray here since not all platforms support the string.Join which takes IEnumerable.
string supportedTypesAsString = String.Join(", ", supportedMediaTypes.Select(mt => mt.MediaType.ToText()).ToArray());
throw new ODataContentTypeException(Strings.MediaTypeUtils_DidNotFindMatchingMediaType(supportedTypesAsString, settings.AcceptableMediaTypes));
}
selectedMediaTypeWithFormat = supportedMediaTypes[matchInfo.TargetTypeIndex];
specifiedCharset = specifiedTypes[matchInfo.SourceTypeIndex].Value;
}
format = selectedMediaTypeWithFormat.Format;
mediaType = selectedMediaTypeWithFormat.MediaType;
// If a charset was specified with the accept header, consider it for the encoding
string acceptableCharsets = settings.AcceptableCharsets;
if (specifiedCharset != null)
{
acceptableCharsets = acceptableCharsets == null ? specifiedCharset : specifiedCharset + "," + acceptableCharsets;
}
encoding = GetEncoding(acceptableCharsets, payloadKind, mediaType, /*useDefaultEncoding*/ true);
}
return(format);
}
/// <summary> /// Creates an instance of the output context for this format. /// </summary> /// <param name="messageInfo">The context information for the message.</param> /// <param name="messageWriterSettings">Configuration settings of the OData writer.</param> /// <returns>Task which represents the pending create operation.</returns> public abstract Task <ODataOutputContext> CreateOutputContextAsync(ODataMessageInfo messageInfo, ODataMessageWriterSettings messageWriterSettings);