/// <summary>
/// Build the top level select clause as a string.
/// </summary>
/// <param name="selectExpandClause">top level select expand clause.</param>
/// <returns>the string representation of the top level select clause.</returns>
private static string BuildTopLevelSelect(SelectExpandClause selectExpandClause)
{
// Special case to build the top level select clause (this it the only time that we actualy
// modify the selectClause because in V4 the the top level select clause can only modify the top
// level).
return(String.Join(",", selectExpandClause.GetCurrentLevelSelectList().ToArray()));
}
/// <summary>
/// Traverse a SelectExpandClause using given functions.
/// </summary>
/// <typeparam name="T">Type of the sub processing result for expand items.</typeparam>
/// <param name="selectExpandClause">The select expand clause for evaluation.</param>
/// <param name="processSubResult">The method to deal with sub expand result.</param>
/// <param name="combineSelectAndExpand">The method to combine select and expand result lists.</param>
/// <param name="result">The result of the traversing.</param>
internal static void Traverse<T>(this SelectExpandClause selectExpandClause, Func<string, T, T> processSubResult, Func<IList<string>, IList<T>, T> combineSelectAndExpand, out T result)
{
List<string> selectList = selectExpandClause.GetCurrentLevelSelectList();
List<T> expandList = new List<T>();
foreach (ExpandedNavigationSelectItem expandSelectItem in selectExpandClause.SelectedItems.Where(I => I.GetType() == typeof(ExpandedNavigationSelectItem)))
{
string currentExpandClause = String.Join("/", expandSelectItem.PathToNavigationProperty.WalkWith(PathSegmentToStringTranslator.Instance).ToArray());
T subResult = default(T);
if (expandSelectItem.SelectAndExpand.SelectedItems.Any())
{
Traverse(expandSelectItem.SelectAndExpand, processSubResult, combineSelectAndExpand, out subResult);
}
var expandItem = processSubResult(currentExpandClause, subResult);
if (expandItem != null)
{
expandList.Add(expandItem);
}
}
foreach (ExpandedReferenceSelectItem expandSelectItem in selectExpandClause.SelectedItems.Where(I => I.GetType() == typeof(ExpandedReferenceSelectItem)))
{
string currentExpandClause = String.Join("/", expandSelectItem.PathToNavigationProperty.WalkWith(PathSegmentToStringTranslator.Instance).ToArray());
currentExpandClause += "/$ref";
var expandItem = processSubResult(currentExpandClause, default(T));
if (expandItem != null)
{
expandList.Add(expandItem);
}
}
result = combineSelectAndExpand(selectList, expandList);
}
