private void Read(Lazy<ODataReader> lazyReader)
{
foreach (var state in this.expectedStates)
{
lazyReader.Value.Read();
ExceptionUtilities.Assert(lazyReader.Value.State == state, "Expected %1, Found %2", state, lazyReader.Value.State);
switch (state)
{
case ODataReaderState.FeedStart:
if (readItems.Count > 0)
{
ODataNavigationLink navLink = (ODataNavigationLink)readItems.Peek();
var annotation = navLink.GetAnnotation<ODataNavigationLinkExpandedItemObjectModelAnnotation>();
if (annotation == null)
{
annotation = new ODataNavigationLinkExpandedItemObjectModelAnnotation();
navLink.SetAnnotation(annotation);
}
annotation.ExpandedItem = lazyReader.Value.Item;
}
readItems.Push(lazyReader.Value.Item);
break;
case ODataReaderState.EntryStart:
var currentEntry = (ODataEntry)lazyReader.Value.Item;
if (readItems.Count > 0)
{
ODataFeed feed = readItems.Peek() as ODataFeed;
if (feed != null)
{
var annotation = feed.GetAnnotation<ODataFeedEntriesObjectModelAnnotation>();
if (annotation == null)
{
annotation = new ODataFeedEntriesObjectModelAnnotation();
feed.SetAnnotation(annotation);
}
annotation.Add((ODataEntry)lazyReader.Value.Item);
}
else
{
ODataNavigationLink navLink = (ODataNavigationLink)readItems.Peek();
var annotation = navLink.GetAnnotation<ODataNavigationLinkExpandedItemObjectModelAnnotation>();
if (annotation == null)
{
annotation = new ODataNavigationLinkExpandedItemObjectModelAnnotation();
navLink.SetAnnotation(annotation);
}
annotation.ExpandedItem = currentEntry;
}
}
readItems.Push(currentEntry);
break;
case ODataReaderState.NavigationLinkStart:
ODataEntry entry = (ODataEntry)readItems.Peek();
var navLinksAnnotation = entry.GetAnnotation<ODataEntryNavigationLinksObjectModelAnnotation>();
if (navLinksAnnotation == null)
{
navLinksAnnotation = new ODataEntryNavigationLinksObjectModelAnnotation();
entry.SetAnnotation(navLinksAnnotation);
}
navLinksAnnotation.Add((ODataNavigationLink)lazyReader.Value.Item, entry.Properties.Count() + navLinksAnnotation.Count);
readItems.Push(lazyReader.Value.Item);
break;
case ODataReaderState.EntryEnd:
case ODataReaderState.FeedEnd:
case ODataReaderState.NavigationLinkEnd:
if (readItems.Count() > 1)
readItems.Pop();
break;
}
}
this.expectedStates.Clear();
}
/// <summary>
/// Read a navigation link with an <see cref="ODataReader"/> positioned on the navigation link start.
/// </summary>
/// <param name="reader">The <see cref="ODataReader"/> to use for reading the navigation link.</param>
/// <returns>An <see cref="ODataNavigationLink"/>, possibly with annotations.</returns>
/// <returns></returns>
private ODataNavigationLink ReadNavigationLink(ODataReader reader)
{
this.assert.AreEqual(ODataReaderState.NavigationLinkStart, reader.State, "Reader states don't match.");
reader.Read();
List<ODataItem> expandedItems = new List<ODataItem>();
while (reader.State != ODataReaderState.NavigationLinkEnd)
{
if (reader.State == ODataReaderState.EntryStart)
{
if (reader.Item == null)
{
expandedItems.Add(null);
// Read over the entry start
reader.Read();
}
else
{
expandedItems.Add(this.ReadEntry(reader));
}
this.assert.AreEqual(ODataReaderState.EntryEnd, reader.State, "Reader states don't match.");
}
else if (reader.State == ODataReaderState.FeedStart)
{
expandedItems.Add(this.ReadFeed(reader));
this.assert.AreEqual(ODataReaderState.FeedEnd, reader.State, "Reader states don't match.");
}
else if (reader.State == ODataReaderState.EntityReferenceLink)
{
this.assert.IsTrue(this.testConfiguration.IsRequest, "EntityReferenceLink state should only be returned in requests.");
ODataEntityReferenceLink entityReferenceLink = (ODataEntityReferenceLink)reader.Item;
this.assert.IsNotNull(entityReferenceLink, "Reader should never report null entity reference link.");
expandedItems.Add(entityReferenceLink);
}
else
{
this.assert.Fail("Unexpected reader state '" + reader.State + "' for reading a navigation link.");
}
reader.Read();
}
this.assert.AreEqual(ODataReaderState.NavigationLinkEnd, reader.State, "Reader states don't match.");
ODataNavigationLink navigationLink = (ODataNavigationLink)reader.Item;
ODataNavigationLinkExpandedItemObjectModelAnnotation expandedLinkAnnotation = null;
if (this.testConfiguration.IsRequest)
{
this.assert.IsTrue(expandedItems.Count > 0, "Deferred link (navigation link without any content) should only be returned in responses.");
expandedLinkAnnotation = expandedItems.Count > 1
? new ODataNavigationLinkExpandedItemObjectModelAnnotation() { ExpandedItem = expandedItems }
: new ODataNavigationLinkExpandedItemObjectModelAnnotation() { ExpandedItem = expandedItems[0] };
}
else
{
this.assert.IsTrue(expandedItems.Count <= 1, "In response each navigation link may contain at most one item in its content (entry or feed).");
if (expandedItems.Count == 1)
{
expandedLinkAnnotation = new ODataNavigationLinkExpandedItemObjectModelAnnotation() { ExpandedItem = expandedItems[0] };
}
}
if (expandedLinkAnnotation != null)
{
navigationLink.SetAnnotation(expandedLinkAnnotation);
}
return navigationLink;
}