private HttpResponseMessage CreateQueryResponse(IQueryable query, IEdmType edmType, ETag etag)
{
var typeReference = GetTypeReference(edmType);
BaseSingleResult singleResult = null;
HttpResponseMessage response = null;
if (typeReference.IsPrimitive())
{
if (shouldReturnCount || shouldWriteRawValue)
{
var rawResult = new RawResult(query, typeReference);
singleResult = rawResult;
response = Request.CreateResponse(HttpStatusCode.OK, rawResult);
}
else
{
var primitiveResult = new PrimitiveResult(query, typeReference);
singleResult = primitiveResult;
response = Request.CreateResponse(HttpStatusCode.OK, primitiveResult);
}
}
if (typeReference.IsComplex())
{
var complexResult = new ComplexResult(query, typeReference);
singleResult = complexResult;
response = Request.CreateResponse(HttpStatusCode.OK, complexResult);
}
if (typeReference.IsEnum())
{
if (shouldWriteRawValue)
{
var rawResult = new RawResult(query, typeReference);
singleResult = rawResult;
response = Request.CreateResponse(HttpStatusCode.OK, rawResult);
}
else
{
var enumResult = new EnumResult(query, typeReference);
singleResult = enumResult;
response = Request.CreateResponse(HttpStatusCode.OK, enumResult);
}
}
if (singleResult != null)
{
if (singleResult.Result == null)
{
// Per specification, If the property is single-valued and has the null value,
// the service responds with 204 No Content.
return(Request.CreateResponse(HttpStatusCode.NoContent));
}
return(response);
}
if (typeReference.IsCollection())
{
var elementType = typeReference.AsCollection().ElementType();
if (elementType.IsPrimitive() || elementType.IsEnum())
{
return(Request.CreateResponse(HttpStatusCode.OK, new NonResourceCollectionResult(query, typeReference)));
}
return(Request.CreateResponse(HttpStatusCode.OK, new ResourceSetResult(query, typeReference)));
}
var entityResult = query.SingleOrDefault();
if (entityResult == null)
{
return(Request.CreateResponse(HttpStatusCode.NoContent));
}
// Check the ETag here
if (etag != null)
{
// request with If-Match header, if match, then should return whole content
// request with If-Match header, if not match, then should return 412
// request with If-None-Match header, if match, then should return 304
// request with If-None-Match header, if not match, then should return whole content
etag.EntityType = query.ElementType;
query = etag.ApplyTo(query);
entityResult = query.SingleOrDefault();
if (entityResult == null && !etag.IsIfNoneMatch)
{
return(Request.CreateResponse(HttpStatusCode.PreconditionFailed));
}
else if (entityResult == null)
{
return(Request.CreateResponse(HttpStatusCode.NotModified));
}
}
// Using reflection to create response for single entity so passed in parameter is not object type,
// but will be type of real entity type, then EtagMessageHandler can be used to set ETAG header
// when response is single entity.
// There are three HttpRequestMessageExtensions class defined in different assembles
// Fix by @xuzhg in PR #609.
var assembly = System.Reflection.Assembly.GetAssembly(typeof(AcceptVerbsAttribute));
var type = assembly.GetType("System.Net.Http.HttpRequestMessageExtensions");
var genericMethod = type.GetMethods()
.Where(m => m.Name == "CreateResponse" && m.GetParameters().Length == 3);
var method = genericMethod.FirstOrDefault().MakeGenericMethod(query.ElementType);
response = method.Invoke(null, new object[] { Request, HttpStatusCode.OK, entityResult }) as HttpResponseMessage;
return(response);
}