internal static void CheckResourceExists(bool resourceExists, string identifier)
{
if (!resourceExists)
{
throw DataServiceException.CreateResourceNotFound(identifier);
}
}
internal static void CheckNullDirectReference(object result, SegmentInfo segmentInfo)
{
if (segmentInfo.IsDirectReference && (result == null))
{
throw DataServiceException.CreateResourceNotFound(segmentInfo.Identifier);
}
}
/// <summary>
/// Checks query result.
/// </summary>
/// <param name="result">Query result to be checked.</param>
/// <param name="segmentInfo">Segment details for the <paramref name="result"/>.</param>
internal static void CheckQueryResult(object result, SegmentInfo segmentInfo)
{
// e.g. /Customers(4) - if there is a direct reference to an entity, it should not be null.
// e.g. $value also must not be null, since you are dereferencing the values
// Any other case, having null is fine
if (segmentInfo.IsDirectReference && result == null)
{
throw DataServiceException.CreateResourceNotFound(segmentInfo.Identifier);
}
IEnumerable enumerable;
if (segmentInfo.TargetKind == RequestTargetKind.OpenProperty &&
WebUtil.IsElementIEnumerable(result, out enumerable))
{
throw DataServiceException.CreateSyntaxError(
Strings.InvalidUri_OpenPropertiesCannotBeCollection(segmentInfo.Identifier));
}
}
