/// <summary>
/// Gets the type and uri specified in the metadata object in the given json object.
/// </summary>
/// <param name="jsonObjectTable">jsonObject which contains the metadata information</param>
/// <param name="expectedType">expected type that this segment of the uri is targeted to</param>
/// <param name="topLevel">whether the segment represents the top level object.</param>
/// <param name="uri">uri as specified in the metadata object. If its not specified, this is set to null</param>
/// <param name="metadataElementSpecified">returns true if the metadata element was specified</param>
/// <returns>typename and uri as specified in the metadata object</returns>
private ResourceType GetTypeAndUriFromMetadata(
Dictionary <String, Object> jsonObjectTable,
ResourceType expectedType,
bool topLevel,
out string uri,
out bool metadataElementSpecified)
{
metadataElementSpecified = false;
// Get the metadata object
object metadataObject;
ResourceType targetType = expectedType;
bool typeNameSpecified = false;
uri = null;
if (jsonObjectTable.TryGetValue(XmlConstants.JsonMetadataString, out metadataObject))
{
metadataElementSpecified = true;
JsonReader.JsonObjectRecords metadata = metadataObject as JsonReader.JsonObjectRecords;
if (metadata == null)
{
throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidMetadataContent);
}
// Get the type information from the metadata object. if the type name is not specified,
// then return the expectedType as the target type
object objectTypeName;
if (metadata.Entries.TryGetValue(XmlConstants.JsonTypeString, out objectTypeName))
{
string typeName = objectTypeName as string;
if (string.IsNullOrEmpty(typeName))
{
throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidTypeMetadata);
}
// Resolve resource type name
targetType = this.Service.Provider.TryResolveResourceType(typeName);
if (targetType == null || targetType.ResourceTypeKind == ResourceTypeKind.Primitive)
{
throw DataServiceException.CreateBadRequestError(Strings.BadRequest_InvalidTypeName(typeName));
}
if (expectedType != null && !expectedType.IsAssignableFrom(targetType))
{
throw DataServiceException.CreateBadRequestError(Strings.BadRequest_InvalidTypeSpecified(typeName, expectedType.FullName));
}
typeNameSpecified = true;
}
uri = JsonDeserializer.ReadUri(metadata.Entries);
}
// Type information is optional for bind operations.
// Top level operations cannot be bind operations, since uri need to have $links
// for top level bind operations and that's a different code path.
// For bind operations, uri must be specified and nothing else should be specified.
bool bindOperation = !topLevel && uri != null && jsonObjectTable.Count == 1;
// type name must be specified for POST or PUT/MERGE operations.
if (!typeNameSpecified)
{
if (!bindOperation)
{
if (expectedType == null)
{
// For open properties, you must specify the type information
throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingTypeInformationForOpenTypeProperties);
}
else if (this.Service.Provider.HasDerivedTypes(expectedType))
{
// For types that take part in inheritance, type information must be specified.
throw DataServiceException.CreateBadRequestError(Strings.BadRequest_TypeInformationMustBeSpecifiedForInhertiance);
}
}
else
{
// If the type name is not specified, we should set the type name to null, since in case of inheritance,
// we don't want to guess the type information.
targetType = null;
}
}
return(targetType);
}
/// <summary>
/// Creates a new <see cref="Deserializer"/> for the specified stream.
/// </summary>
/// <param name="description">description about the request uri.</param>
/// <param name="dataService">Data service for which the deserializer will act.</param>
/// <param name="update">indicates whether this is a update operation or not</param>
/// <param name="tracker">Tracker to use for modifications.</param>
/// <returns>A new instance of <see cref="Deserializer"/>.</returns>
internal static Deserializer CreateDeserializer(RequestDescription description, IDataService dataService, bool update, UpdateTracker tracker)
{
string mimeType;
System.Text.Encoding encoding;
DataServiceHostWrapper host = dataService.OperationContext.Host;
HttpProcessUtility.ReadContentType(host.RequestContentType, out mimeType, out encoding);
ContentFormat requestFormat = WebUtil.SelectRequestFormat(mimeType, description);
Stream requestStream = host.RequestStream;
Debug.Assert(requestStream != null, "requestStream != null");
Debug.Assert(tracker != null, "Change tracker must always be created.");
Deserializer deserializer = null;
Debug.Assert(
(!update /*POST*/ && dataService.OperationContext.Host.AstoriaHttpVerb == AstoriaVerbs.POST) ||
(update /*PUT,MERGE*/ && (dataService.OperationContext.Host.AstoriaHttpVerb == AstoriaVerbs.MERGE || dataService.OperationContext.Host.AstoriaHttpVerb == AstoriaVerbs.PUT)),
"For PUT and MERGE, update must be true; for POST, update must be false");
switch (requestFormat)
{
case ContentFormat.Json:
deserializer = new JsonDeserializer(
requestStream,
encoding,
update,
dataService,
tracker);
break;
case ContentFormat.Atom:
SyndicationFormatterFactory factory = new Atom10FormatterFactory();
deserializer = new SyndicationDeserializer(
requestStream, // stream
encoding, // encoding
dataService, // dataService
update,
factory,
tracker); // factory
break;
case ContentFormat.PlainXml:
deserializer = new PlainXmlDeserializer(
requestStream,
encoding,
dataService,
update,
tracker);
break;
default:
throw new DataServiceException(415, Strings.BadRequest_UnsupportedRequestContentType(host.RequestContentType));
}
Debug.Assert(deserializer != null, "deserializer != null");
return deserializer;
}