private static string GetRootElementName(ODataPath path)
{
if (path != null)
{
ODataPathSegment lastSegment = path.Segments.LastOrDefault();
if (lastSegment != null)
{
OperationSegment actionSegment = lastSegment as OperationSegment;
if (actionSegment != null)
{
IEdmAction action = actionSegment.Operations.Single() as IEdmAction;
if (action != null)
{
return(action.Name);
}
}
PropertySegment propertyAccessSegment = lastSegment as PropertySegment;
if (propertyAccessSegment != null)
{
return(propertyAccessSegment.Property.Name);
}
}
}
return(null);
}
internal static IEdmAction GetAction(ODataDeserializerContext readContext)
{
if (readContext == null)
{
throw Error.ArgumentNull("readContext");
}
ODataPath path = readContext.Path;
if (path == null || path.Segments.Count == 0)
{
throw new SerializationException(SRResources.ODataPathMissing);
}
IEdmAction action = null;
if (path.PathTemplate == "~/unboundaction")
{
// only one segment, it may be an unbound action
OperationImportSegment unboundActionSegment = path.Segments.Last() as OperationImportSegment;
if (unboundActionSegment != null)
{
IEdmActionImport actionImport = unboundActionSegment.OperationImports.First() as IEdmActionImport;
if (actionImport != null)
{
action = actionImport.Action;
}
}
}
else
{
// otherwise, it may be a bound action
OperationSegment actionSegment = path.Segments.Last() as OperationSegment;
if (actionSegment != null)
{
action = actionSegment.Operations.First() as IEdmAction;
}
}
if (action == null)
{
string message = Error.Format(SRResources.RequestNotActionInvocation, path.ToString());
throw new SerializationException(message);
}
return(action);
}
// This function is used to determine whether an OData path includes operation (import) path segments.
// We use this function to make sure the value of ODataUri.Path in ODataMessageWriterSettings is null
// when any path segment is an operation. ODL will try to calculate the context URL if the ODataUri.Path
// equals to null.
private static bool IsOperationPath(ODataPath path)
{
if (path == null)
{
return(false);
}
foreach (ODataPathSegment segment in path.Segments)
{
if (segment is OperationSegment ||
segment is OperationImportSegment)
{
return(true);
}
}
return(false);
}
private void WriteResponseBody(OutputFormatterWriteContext context)
{
HttpContext httpContext = context.HttpContext;
HttpRequest request = context.HttpContext.Request;
HttpResponse response = context.HttpContext.Response;
IEdmModel model = context.HttpContext.ODataFeature().Model;
if (model == null)
{
throw Error.InvalidOperation(SRResources.RequestMustHaveModel);
}
object value = null;
object graph = null;
var objectResult = context.Object as PageResult <object>;
if (objectResult != null)
{
value = objectResult.Items;
graph = objectResult;
}
else
{
value = context.Object;
graph = value;
}
var type = value.GetType();
ODataSerializer serializer = GetSerializer(type, value, context);
IUrlHelper urlHelper = context.HttpContext.UrlHelper();
ODataPath path = httpContext.ODataFeature().Path;
IEdmNavigationSource targetNavigationSource = path == null ? null : path.NavigationSource;
string preferHeader = RequestPreferenceHelpers.GetRequestPreferHeader(request);
string annotationFilter = null;
if (!String.IsNullOrEmpty(preferHeader))
{
ODataMessageWrapper messageWrapper = new ODataMessageWrapper(response.Body, response.Headers);
messageWrapper.SetHeader(RequestPreferenceHelpers.PreferHeaderName, preferHeader);
annotationFilter = messageWrapper.PreferHeader().AnnotationFilter;
}
IODataResponseMessage responseMessage = new ODataMessageWrapper(response.Body, response.Headers);
if (annotationFilter != null)
{
responseMessage.PreferenceAppliedHeader().AnnotationFilter = annotationFilter;
}
Uri baseAddress = GetBaseAddress(request);
ODataMessageWriterSettings writerSettings = _messageWriterSettings.Clone();
writerSettings.BaseUri = baseAddress;
writerSettings.Version = ODataVersion.V4;
writerSettings.Validations = writerSettings.Validations & ~ValidationKinds.ThrowOnUndeclaredPropertyForNonOpenType;
string metadataLink = urlHelper.CreateODataLink(request, MetadataSegment.Instance);
if (metadataLink == null)
{
throw new SerializationException(SRResources.UnableToDetermineMetadataUrl);
}
writerSettings.ODataUri = new ODataUri
{
ServiceRoot = baseAddress,
// TODO: 1604 Convert webapi.odata's ODataPath to ODL's ODataPath, or use ODL's ODataPath.
SelectAndExpand = httpContext.ODataFeature().SelectExpandClause,
Path = (path == null) ? null : path.ODLPath
//Path = (path == null || IsOperationPath(path)) ? null : path.ODLPath,
};
using (ODataMessageWriter messageWriter = new ODataMessageWriter(responseMessage, writerSettings, model))
{
ODataSerializerContext writeContext = new ODataSerializerContext()
{
Context = context.HttpContext,
Url = urlHelper,
NavigationSource = targetNavigationSource,
Model = model,
RootElementName = GetRootElementName(path) ?? "root",
SkipExpensiveAvailabilityChecks = serializer.ODataPayloadKind == ODataPayloadKind.ResourceSet,
Path = path,
MetadataLevel = ODataMediaTypes.GetMetadataLevel(MediaTypeHeaderValue.Parse(context.ContentType.Value)),
SelectExpandClause = request.ODataFeature().SelectExpandClause,
};
serializer.WriteObject(graph, type, messageWriter, writeContext);
}
}
private static void GenerateBaseODataPathSegmentsForNonSingletons(
ODataPath path,
IEdmNavigationSource navigationSource,
IList <ODataPathSegment> odataPath)
{
// If the navigation is not a singleton we need to walk all of the path segments to generate a
// contextually accurate URI.
bool segmentFound = false;
bool containedFound = false;
if (path != null)
{
var segments = path.Segments;
int length = segments.Count;
int previousNavigationPathIndex = -1;
for (int i = 0; i < length; i++)
{
ODataPathSegment pathSegment = segments[i];
IEdmNavigationSource currentNavigationSource = null;
var entitySetPathSegment = pathSegment as EntitySetSegment;
if (entitySetPathSegment != null)
{
currentNavigationSource = entitySetPathSegment.EntitySet;
}
var navigationPathSegment = pathSegment as NavigationPropertySegment;
if (navigationPathSegment != null)
{
currentNavigationSource = navigationPathSegment.NavigationSource;
}
if (containedFound)
{
odataPath.Add(pathSegment);
}
else
{
if (navigationPathSegment != null &&
navigationPathSegment.NavigationProperty.ContainsTarget)
{
containedFound = true;
//The path should have the last non-contained navigation property
if (previousNavigationPathIndex != -1)
{
for (int j = previousNavigationPathIndex; j <= i; j++)
{
odataPath.Add(segments[j]);
}
}
}
}
// If we've found our target navigation in the path that means we've correctly populated the
// segments up to the navigation and we can ignore the remaining segments.
if (currentNavigationSource != null)
{
previousNavigationPathIndex = i;
if (currentNavigationSource == navigationSource)
{
segmentFound = true;
break;
}
}
}
}
if (!segmentFound || !containedFound)
{
// If the target navigation was not found in the current path that means we lack any context that
// would suggest a scenario other than directly accessing an entity set, so we must assume that's
// the case.
odataPath.Clear();
IEdmContainedEntitySet containmnent = navigationSource as IEdmContainedEntitySet;
if (containmnent != null)
{
EdmEntityContainer container = new EdmEntityContainer("NS", "Default");
IEdmEntitySet entitySet = new EdmEntitySet(container, navigationSource.Name,
navigationSource.EntityType());
odataPath.Add(new EntitySetSegment(entitySet));
}
else
{
odataPath.Add(new EntitySetSegment((IEdmEntitySet)navigationSource));
}
}
}
///// <summary>
///// Initializes a new instance of the <see cref="ODataCountMediaTypeMapping"/> class.
///// </summary>
//public ODataCountMediaTypeMapping()
// : base("text/plain")
//{
//}
///// <inheritdoc/>
//public override double TryMatchMediaType(HttpRequestMessage request)
//{
// if (request == null)
// {
// throw Error.ArgumentNull("request");
// }
// return IsCountRequest(request) ? 1 : 0;
//}
internal static bool IsCountRequest(HttpContext context)
{
ODataPath path = context.ODataFeature().Path;
return(path != null && path.Segments.LastOrDefault() is CountSegment);
}
private void WriteResponseBody(OutputFormatterWriteContext context)
{
HttpContext httpContext = context.HttpContext;
HttpRequest request = context.HttpContext.Request;
HttpResponse response = context.HttpContext.Response;
IEdmModel model = context.HttpContext.ODataFeature().Model;
if (model == null)
{
throw Error.InvalidOperation(SRResources.RequestMustHaveModel);
}
object value = null;
object graph = null;
var objectResult = context.Object as PageResult <object>;
if (objectResult != null)
{
value = objectResult.Items;
graph = objectResult;
}
else
{
value = context.Object;
graph = value;
}
var type = value.GetType();
ODataSerializer serializer = GetSerializer(type, value, context);
IUrlHelper urlHelper = context.HttpContext.UrlHelper();
ODataPath path = httpContext.ODataFeature().Path;
IEdmNavigationSource targetNavigationSource = path == null ? null : path.NavigationSource;
string preferHeader = RequestPreferenceHelpers.GetRequestPreferHeader(request);
string annotationFilter = null;
if (!String.IsNullOrEmpty(preferHeader))
{
ODataMessageWrapper messageWrapper = new ODataMessageWrapper(response.Body, response.Headers);
messageWrapper.SetHeader(RequestPreferenceHelpers.PreferHeaderName, preferHeader);
annotationFilter = messageWrapper.PreferHeader().AnnotationFilter;
}
IODataResponseMessage responseMessage = new ODataMessageWrapper(response.Body, response.Headers);
if (annotationFilter != null)
{
responseMessage.PreferenceAppliedHeader().AnnotationFilter = annotationFilter;
}
Uri baseAddress = GetBaseAddress(request);
ODataMessageWriterSettings writerSettings = _messageWriterSettings.Clone();
writerSettings.BaseUri = baseAddress;
writerSettings.Version = ODataVersion.V4;
writerSettings.Validations = writerSettings.Validations & ~ValidationKinds.ThrowOnUndeclaredPropertyForNonOpenType;
string metadataLink = urlHelper.CreateODataLink(request, MetadataSegment.Instance);
if (metadataLink == null)
{
throw new SerializationException(SRResources.UnableToDetermineMetadataUrl);
}
writerSettings.ODataUri = new ODataUri
{
ServiceRoot = baseAddress,
// TODO: 1604 Convert webapi.odata's ODataPath to ODL's ODataPath, or use ODL's ODataPath.
SelectAndExpand = httpContext.ODataFeature().SelectExpandClause,
Path = (path == null) ? null : path.ODLPath
//Path = (path == null || IsOperationPath(path)) ? null : path.ODLPath,
};
#region 为OData添加缓存 使用的EF二级缓存 这里是先从缓存获取数据
//var queryResult = graph as IQueryable;
//PageResult<object> target = null;
//if (queryResult == null)
//{
// target = graph as PageResult<object>;
// if (target != null) queryResult = target.Items.AsQueryable();
//}
//var isReadCache = queryResult != null || target != null;
//var cacheValue = isReadCache?queryResult.CacheResult(context.HttpContext.RequestServices):null;
//if (isReadCache&&target != null && cacheValue != null)
//{
// var pageResult = cacheValue as IEnumerable<object>;
// //long? count = target.Count.HasValue ? (long?)pageResult.LongCount() : null;
// cacheValue = new PageResult<object>(pageResult, null, target.Count);
//}
//if (isReadCache&&cacheValue != null) graph = cacheValue;
#endregion
using (ODataMessageWriter messageWriter = new ODataMessageWriter(responseMessage, writerSettings, model))
{
ODataSerializerContext writeContext = new ODataSerializerContext()
{
Context = context.HttpContext,
Url = urlHelper,
NavigationSource = targetNavigationSource,
Model = model,
RootElementName = GetRootElementName(path) ?? "root",
SkipExpensiveAvailabilityChecks = serializer.ODataPayloadKind == ODataPayloadKind.ResourceSet,
Path = path,
MetadataLevel = ODataMediaTypes.GetMetadataLevel(MediaTypeHeaderValue.Parse(context.ContentType.Value)),
SelectExpandClause = request.ODataFeature().SelectExpandClause,
};
serializer.WriteObject(graph, type, messageWriter, writeContext);
#region 这里是往缓存中 存储数据
//if (isReadCache&&cacheValue == null)
//{
// writeContext.Context.Response.Body.Position = 0;
// StreamReader reder = new StreamReader(writeContext.Context.Response.Body);
// var bodyStr = reder.ReadToEnd();
// JObject.Parse(bodyStr).TryGetValue("value",out JToken values);
// cacheValue = values.ToObject(type.MarkListType());
// queryResult.CacheQuerable(cacheValue, writeContext.Context.RequestServices);
//}
#endregion
}
}
