internal DeltaItemKind GetDelteItemKind(object item) { IEdmChangedObject edmChangedObject = item as IEdmChangedObject; if (edmChangedObject != null) { return(edmChangedObject.DeltaKind); } IDeltaSetItem deltaSetItem = item as IDeltaSetItem; if (deltaSetItem != null) { return(deltaSetItem.Kind); } throw new SerializationException(Error.Format( SRResources.CannotWriteType, GetType().Name, item.GetType().FullName)); }
private async Task WriteFeedAsync(IEnumerable enumerable, IEdmTypeReference feedType, ODataWriter writer, ODataSerializerContext writeContext) { Contract.Assert(writer != null); Contract.Assert(writeContext != null); Contract.Assert(enumerable != null); Contract.Assert(feedType != null); IEdmStructuredTypeReference elementType = GetResourceType(feedType); if (elementType.IsComplex()) { ODataResourceSet resourceSet = new ODataResourceSet() { TypeName = feedType.FullName() }; await writer.WriteStartAsync(resourceSet).ConfigureAwait(false); ODataResourceSerializer entrySerializer = SerializerProvider.GetEdmTypeSerializer(elementType) as ODataResourceSerializer; if (entrySerializer == null) { throw new SerializationException( Error.Format(SRResources.TypeCannotBeSerialized, elementType.FullName())); } foreach (object entry in enumerable) { await entrySerializer.WriteDeltaObjectInlineAsync(entry, elementType, writer, writeContext).ConfigureAwait(false); } } else { ODataDeltaResourceSet deltaFeed = CreateODataDeltaFeed(enumerable, feedType.AsCollection(), writeContext); if (deltaFeed == null) { throw new SerializationException(Error.Format(SRResources.CannotSerializerNull, DeltaFeed)); } // save the next page link for later to support JSON odata.streaming. Func <object, Uri> nextLinkGenerator = GetNextLinkGenerator(deltaFeed, enumerable, writeContext); deltaFeed.NextPageLink = null; //Start writing of the Delta Feed await writer.WriteStartAsync(deltaFeed).ConfigureAwait(false); object lastResource = null; //Iterate over all the entries present and select the appropriate write method. //Write method creates ODataDeltaDeletedEntry / ODataDeltaDeletedLink / ODataDeltaLink or ODataEntry. foreach (object entry in enumerable) { if (entry == null) { throw new SerializationException(SRResources.NullElementInCollection); } lastResource = entry; IEdmChangedObject edmChangedObject = entry as IEdmChangedObject; if (edmChangedObject == null) { throw new SerializationException(Error.Format( SRResources.CannotWriteType, GetType().Name, enumerable.GetType().FullName)); } switch (edmChangedObject.DeltaKind) { case EdmDeltaEntityKind.DeletedEntry: await WriteDeltaDeletedEntryAsync(entry, writer, writeContext).ConfigureAwait(false); break; case EdmDeltaEntityKind.DeletedLinkEntry: await WriteDeltaDeletedLinkAsync(entry, writer, writeContext).ConfigureAwait(false); break; case EdmDeltaEntityKind.LinkEntry: await WriteDeltaLinkAsync(entry, writer, writeContext).ConfigureAwait(false); break; case EdmDeltaEntityKind.Entry: { ODataResourceSerializer entrySerializer = SerializerProvider.GetEdmTypeSerializer(elementType) as ODataResourceSerializer; if (entrySerializer == null) { throw new SerializationException( Error.Format(SRResources.TypeCannotBeSerialized, elementType.FullName())); } await entrySerializer.WriteDeltaObjectInlineAsync(entry, elementType, writer, writeContext) .ConfigureAwait(false); break; } default: break; } } // Subtle and surprising behavior: If the NextPageLink property is set before calling WriteStart(feed), // the next page link will be written early in a manner not compatible with odata.streaming=true. Instead, if // the next page link is not set when calling WriteStart(feed) but is instead set later on that feed // object before calling WriteEnd(), the next page link will be written at the end, as required for // odata.streaming=true support. deltaFeed.NextPageLink = nextLinkGenerator(lastResource); } //End Writing of the Delta Feed await writer.WriteEndAsync().ConfigureAwait(false); }
private void WriteFeed(IEnumerable enumerable, IEdmTypeReference feedType, ODataDeltaWriter writer, ODataSerializerContext writeContext) { Contract.Assert(writer != null); Contract.Assert(writeContext != null); Contract.Assert(enumerable != null); Contract.Assert(feedType != null); ODataDeltaFeed deltaFeed = CreateODataDeltaFeed(enumerable, feedType.AsCollection(), writeContext); if (deltaFeed == null) { throw new SerializationException(Error.Format(SRResources.CannotSerializerNull, DeltaFeed)); } // save this for later to support JSON odata.streaming. Uri nextPageLink = deltaFeed.NextPageLink; deltaFeed.NextPageLink = null; //Start writing of the Delta Feed writer.WriteStart(deltaFeed); //Iterate over all the entries present and select the appropriate write method. //Write method creates ODataDeltaDeletedEntry / ODataDeltaDeletedLink / ODataDeltaLink or ODataEntry. foreach (object entry in enumerable) { if (entry == null) { throw new SerializationException(SRResources.NullElementInCollection); } IEdmChangedObject edmChangedObject = entry as IEdmChangedObject; if (edmChangedObject == null) { throw new SerializationException(Error.Format(SRResources.CannotWriteType, GetType().Name, enumerable.GetType().FullName)); } switch (edmChangedObject.DeltaKind) { case EdmDeltaEntityKind.DeletedEntry: WriteDeltaDeletedEntry(entry, writer, writeContext); break; case EdmDeltaEntityKind.DeletedLinkEntry: WriteDeltaDeletedLink(entry, writer, writeContext); break; case EdmDeltaEntityKind.LinkEntry: WriteDeltaLink(entry, writer, writeContext); break; case EdmDeltaEntityKind.Entry: { IEdmEntityTypeReference elementType = GetEntityType(feedType); ODataEntityTypeSerializer entrySerializer = SerializerProvider.GetEdmTypeSerializer(elementType) as ODataEntityTypeSerializer; if (entrySerializer == null) { throw new SerializationException( Error.Format(SRResources.TypeCannotBeSerialized, elementType.FullName(), typeof(ODataMediaTypeFormatter).Name)); } entrySerializer.WriteDeltaObjectInline(entry, elementType, writer, writeContext); break; } default: break; } } // Subtle and surprising behavior: If the NextPageLink property is set before calling WriteStart(feed), // the next page link will be written early in a manner not compatible with odata.streaming=true. Instead, if // the next page link is not set when calling WriteStart(feed) but is instead set later on that feed // object before calling WriteEnd(), the next page link will be written at the end, as required for // odata.streaming=true support. if (nextPageLink != null) { deltaFeed.NextPageLink = nextPageLink; } //End Writing of the Delta Feed writer.WriteEnd(); }