protected IExpandedResult GetSkipToken(IExpandedResult expanded)
{
if (((expanded != null) && !this.IsCustomPaged) && !this.RequestDescription.IsRequestForEnumServiceOperation)
{
return(expanded.GetExpandedPropertyValue("$skiptoken") as IExpandedResult);
}
return(null);
}
protected object GetExpandedProperty(IExpandedResult expanded, object customObject, ResourceProperty property, ExpandedProjectionNode expandedNode)
{
if (expanded == null)
{
return(WebUtil.GetPropertyValue(this.Provider, customObject, null, property, null));
}
string name = property.Name;
if ((expandedNode != null) && (this.GetCurrentExpandedProjectionNode().ResourceType != expandedNode.TargetResourceType))
{
name = expandedNode.TargetResourceType.FullName + "/" + property.Name;
}
return(expanded.GetExpandedPropertyValue(name));
}
/// <summary>
/// Gets the skip token object contained in the expanded result for standard paging.
/// </summary>
/// <param name="expanded">Current expanded result.</param>
/// <returns>Skip token object if any.</returns>
protected IExpandedResult GetSkipToken(IExpandedResult expanded)
{
if (expanded != null && !this.IsCustomPaged && !this.RequestDescription.IsRequestForEnumServiceOperation)
{
return expanded.GetExpandedPropertyValue(XmlConstants.HttpQueryStringSkipToken) as IExpandedResult;
}
return null;
}
/// <summary>Gets the expandable value for the specified object.</summary>
/// <param name="provider">underlying data source instance.</param>
/// <param name="expanded">Expanded properties for the result, possibly null.</param>
/// <param name="customObject">Object with value to retrieve.</param>
/// <param name="property">Property for which value will be retrieved.</param>
/// <returns>The property value.</returns>
protected static object GetExpandedProperty(DataServiceProviderWrapper provider, IExpandedResult expanded, object customObject, ResourceProperty property)
{
Debug.Assert(property != null, "property != null");
if (expanded == null)
{
return WebUtil.GetPropertyValue(provider, customObject, null, property, null);
}
else
{
// We may end up projecting null as a value of ResourceSetReference property. This can in theory break
// the serializers as they expect a non-null (possibly empty) IEnumerable instead. But note that
// if we project null into the expanded property, we also project null into the ExpandedElement property
// and thus the serializers should recognize this value as null and don't try to expand its properties.
Debug.Assert(
expanded.ExpandedElement != null,
"We should not be accessing expanded properties on null resource.");
return expanded.GetExpandedPropertyValue(property.Name);
}
}