/// <summary>
/// Binds a service operation segment.
/// </summary>
/// <param name="segmentToken">The segment which represents a service operation.</param>
/// <param name="serviceOperation">The service operation to bind.</param>
/// <returns>The bound node.</returns>
private QueryNode BindServiceOperation(SegmentQueryToken segmentToken, IEdmFunctionImport serviceOperation)
{
Debug.Assert(segmentToken != null, "segmentToken != null");
Debug.Assert(serviceOperation != null, "serviceOperation != null");
Debug.Assert(segmentToken.Name == serviceOperation.Name, "The segment represents a different service operation.");
//// This is a metadata copy of the RequestUriProcessor.CreateSegmentForServiceOperation
//// The WCF DS checks the verb in this place, we can't do that here
// All service operations other than those returning IQueryable MUST NOT have () appended to the URI
// V1/V2 behavior: if it's IEnumerable<T>, we do not allow () either, because it's not further composable.
ODataServiceOperationResultKind? resultKind = serviceOperation.GetServiceOperationResultKind(this.model);
if (resultKind != ODataServiceOperationResultKind.QueryWithMultipleResults && segmentToken.NamedValues != null)
{
throw new ODataException(Strings.MetadataBinder_NonQueryableServiceOperationWithKeyLookup(segmentToken.Name));
}
if (!resultKind.HasValue)
{
throw new ODataException(Strings.MetadataBinder_ServiceOperationWithoutResultKind(serviceOperation.Name));
}
IEnumerable<QueryNode> serviceOperationParameters = this.BindServiceOperationParameters(serviceOperation);
switch (resultKind.Value)
{
case ODataServiceOperationResultKind.QueryWithMultipleResults:
if (serviceOperation.ReturnType.TypeKind() != EdmTypeKind.Entity)
{
throw new ODataException(Strings.MetadataBinder_QueryServiceOperationOfNonEntityType(serviceOperation.Name, resultKind.Value.ToString(), serviceOperation.ReturnType.ODataFullName()));
}
CollectionServiceOperationQueryNode collectionServiceOperationQueryNode = new CollectionServiceOperationQueryNode()
{
ServiceOperation = serviceOperation,
Parameters = serviceOperationParameters
};
if (segmentToken.NamedValues != null)
{
return this.BindKeyValues(collectionServiceOperationQueryNode, segmentToken.NamedValues);
}
else
{
return collectionServiceOperationQueryNode;
}
case ODataServiceOperationResultKind.QueryWithSingleResult:
if (!serviceOperation.ReturnType.IsODataEntityTypeKind())
{
throw new ODataException(Strings.MetadataBinder_QueryServiceOperationOfNonEntityType(serviceOperation.Name, resultKind.Value.ToString(), serviceOperation.ReturnType.ODataFullName()));
}
return new SingleValueServiceOperationQueryNode()
{
ServiceOperation = serviceOperation,
Parameters = serviceOperationParameters
};
case ODataServiceOperationResultKind.DirectValue:
if (serviceOperation.ReturnType.IsODataPrimitiveTypeKind())
{
// Direct primitive values are composable, $value is allowed on them.
return new SingleValueServiceOperationQueryNode()
{
ServiceOperation = serviceOperation,
Parameters = serviceOperationParameters
};
}
else
{
// Direct non-primitive values are not composable at all
return new UncomposableServiceOperationQueryNode()
{
ServiceOperation = serviceOperation,
Parameters = serviceOperationParameters
};
}
case ODataServiceOperationResultKind.Enumeration:
case ODataServiceOperationResultKind.Void:
// Enumeration and void service operations are not composable
return new UncomposableServiceOperationQueryNode()
{
ServiceOperation = serviceOperation,
Parameters = serviceOperationParameters
};
default:
throw new ODataException(Strings.General_InternalError(InternalErrorCodes.MetadataBinder_BindServiceOperation));
}
}
/// <summary> /// Translates a service operation node which returns a collection of entities. /// </summary> /// <param name="serviceOperationNode">The collection service operation node to translate.</param> /// <returns>Expression which evaluates to IQueryable<T> where T is the InstanceType of the ResultType of the service operation.</returns> protected abstract Expression TranslateCollectionServiceOperation(CollectionServiceOperationQueryNode serviceOperationNode);
