private ExpandSegmentCollection CheckSingleExpandPath(List <string> path)
{
ResourceType targetResourceType = this.description.TargetResourceType;
ResourceSetWrapper targetContainer = this.description.LastSegmentInfo.TargetContainer;
ExpandSegmentCollection segments = new ExpandSegmentCollection(path.Count);
bool flag = false;
bool previousSegmentIsTypeSegment = false;
for (int i = 0; i < path.Count; i++)
{
string propertyName = path[i];
ResourcePropertyKind stream = ResourcePropertyKind.Stream;
ResourceProperty navigationProperty = targetResourceType.TryResolvePropertyName(propertyName, stream);
if (navigationProperty == null)
{
ResourceType type2 = WebUtil.ResolveTypeIdentifier(this.service.Provider, propertyName, targetResourceType, previousSegmentIsTypeSegment);
if (type2 == null)
{
if (targetResourceType.IsOpenType)
{
throw DataServiceException.CreateBadRequestError(System.Data.Services.Strings.OpenNavigationPropertiesNotSupportedOnOpenTypes(propertyName));
}
throw DataServiceException.CreateSyntaxError(System.Data.Services.Strings.RequestUriProcessor_PropertyNotFound(targetResourceType.FullName, propertyName));
}
this.description.VerifyProtocolVersion(RequestDescription.Version3Dot0, this.service);
targetResourceType = type2;
previousSegmentIsTypeSegment = true;
}
else
{
previousSegmentIsTypeSegment = false;
if (navigationProperty.TypeKind == ResourceTypeKind.EntityType)
{
targetContainer = this.service.Provider.GetContainer(targetContainer, targetResourceType, navigationProperty);
if (targetContainer == null)
{
throw DataServiceException.CreateBadRequestError(System.Data.Services.Strings.BadRequest_InvalidPropertyNameSpecified(navigationProperty.Name, targetResourceType.FullName));
}
bool singleResult = navigationProperty.Kind == ResourcePropertyKind.ResourceReference;
DataServiceConfiguration.CheckResourceRightsForRead(targetContainer, singleResult);
Expression filter = DataServiceConfiguration.ComposeQueryInterceptors(this.service, targetContainer);
if (((targetContainer.PageSize != 0) && !singleResult) && !this.IsCustomPaged)
{
OrderingInfo orderingInfo = new OrderingInfo(true);
ParameterExpression expression = Expression.Parameter(targetContainer.ResourceType.InstanceType, "p");
foreach (ResourceProperty property2 in targetContainer.GetKeyPropertiesForOrderBy())
{
Expression expression3;
if (property2.CanReflectOnInstanceTypeProperty)
{
expression3 = Expression.Property(expression, targetContainer.ResourceType.GetPropertyInfo(property2));
}
else
{
expression3 = Expression.Convert(Expression.Call(null, DataServiceProviderMethods.GetValueMethodInfo, expression, Expression.Constant(property2)), property2.Type);
}
orderingInfo.Add(new OrderingExpression(Expression.Lambda(expression3, new ParameterExpression[] { expression }), true));
}
segments.Add(new ExpandSegment(navigationProperty.Name, filter, targetContainer.PageSize, targetContainer, targetResourceType, navigationProperty, orderingInfo));
this.description.VerifyProtocolVersion(RequestDescription.Version2Dot0, this.service);
this.description.VerifyAndRaiseResponseVersion(RequestDescription.Version2Dot0, this.service);
}
else
{
if (!singleResult && this.IsCustomPaged)
{
this.CheckAndApplyCustomPaging(null);
}
segments.Add(new ExpandSegment(navigationProperty.Name, filter, this.service.Configuration.MaxResultsPerCollection, targetContainer, targetResourceType, navigationProperty, null));
}
this.description.UpdateAndCheckEpmFeatureVersion(targetContainer, this.service);
this.description.UpdateVersions(this.service.OperationContext.Host.RequestAccept, targetContainer, this.service);
flag = false;
targetResourceType = navigationProperty.ResourceType;
}
else
{
flag = true;
}
}
}
if (previousSegmentIsTypeSegment)
{
throw DataServiceException.CreateBadRequestError(System.Data.Services.Strings.RequestQueryProcessor_QueryParametersPathCannotEndInTypeIdentifier("$expand", targetResourceType.FullName));
}
if (!flag)
{
return(segments);
}
return(null);
}
