/// <summary>Marks the entire subtree as projected.</summary>
/// <remarks>This is used when there were no projections specified in the query
/// to mark the entire tree as projected.</remarks>
internal void MarkSubtreeAsProjected()
{
this.projectSubtree = true;
this.projectAllImmediateProperties = false;
foreach (ProjectionNode node in this.nodes)
{
ExpandedProjectionNode expandedNode = node as ExpandedProjectionNode;
if (expandedNode != null)
{
expandedNode.MarkSubtreeAsProjected();
}
}
}
/// <summary>
/// Applies projections from the given select/expand clause to the tree represented by the given node.
/// </summary>
/// <param name="currentNode">The expand tree to apply projections to.</param>
private void ApplyProjectionsToExpandTree(ExpandedProjectionNode currentNode)
{
// If this is the last segment in the path and it was a navigation property,
// mark it to include the entire subtree
if (currentNode.SelectExpandClause.AllSelected)
{
currentNode.ProjectionFound = true;
currentNode.MarkSubtreeAsProjected();
}
foreach (var selectItem in currentNode.SelectExpandClause.SelectedItems)
{
currentNode.ProjectionFound = true;
// '*' is special, it means "Project all immediate properties on this level."
if (selectItem is WildcardSelectItem)
{
currentNode.ProjectAllImmediateProperties = true;
continue;
}
if (selectItem is NamespaceQualifiedWildcardSelectItem)
{
currentNode.ProjectAllImmediateOperations = true;
continue;
}
ODataPath path;
var expandItem = selectItem as ExpandedNavigationSelectItem;
if (expandItem != null)
{
path = expandItem.PathToNavigationProperty;
}
else
{
var pathSelectionItem = selectItem as PathSelectItem;
Debug.Assert(pathSelectionItem != null, "Unexpeced selection item type: " + selectItem.GetType());
path = pathSelectionItem.SelectedPath;
}
ExpandedProjectionNode childNode = this.ApplyPathSelection(path, currentNode);
if (expandItem != null)
{
if (childNode == null)
{
throw DataServiceException.CreateBadRequestError(Strings.RequestQueryProcessor_ProjectedPropertyWithoutMatchingExpand(((NavigationPropertySegment)path.LastSegment).NavigationProperty.Name));
}
this.ApplyProjectionsToExpandTree(childNode);
}
}
}
