internal ODataAtomReader(ODataAtomInputContext atomInputContext, IEdmEntityType expectedEntityType, bool readingFeed) : base(atomInputContext, expectedEntityType, readingFeed, null)
{
this.atomInputContext = atomInputContext;
this.atomEntryAndFeedDeserializer = new ODataAtomEntryAndFeedDeserializer(atomInputContext);
if (this.atomInputContext.MessageReaderSettings.ReaderBehavior.EntryXmlCustomizationCallback != null)
{
this.atomInputContext.InitializeReaderCustomization();
this.atomEntryAndFeedDeserializersStack = new Stack<ODataAtomEntryAndFeedDeserializer>();
this.atomEntryAndFeedDeserializersStack.Push(this.atomEntryAndFeedDeserializer);
}
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="atomInputContext">The input to read the payload from.</param>
/// <param name="expectedEntityType">The expected entity type for the entry to be read (in case of entry reader) or entries in the feed to be read (in case of feed reader).</param>
/// <param name="readingFeed">true if the reader is created for reading a feed; false when it is created for reading an entry.</param>
internal ODataAtomReader(ODataAtomInputContext atomInputContext, IEdmEntityType expectedEntityType, bool readingFeed)
: base(atomInputContext, expectedEntityType, readingFeed, null /*listener*/)
{
DebugUtils.CheckNoExternalCallers();
Debug.Assert(atomInputContext != null, "atomInputContext != null");
this.atomInputContext = atomInputContext;
this.atomEntryAndFeedDeserializer = new ODataAtomEntryAndFeedDeserializer(atomInputContext);
if (this.atomInputContext.MessageReaderSettings.AtomEntryXmlCustomizationCallback != null)
{
this.atomInputContext.InitializeReaderCustomization();
this.atomEntryAndFeedDeserializersStack = new Stack<ODataAtomEntryAndFeedDeserializer>();
this.atomEntryAndFeedDeserializersStack.Push(this.atomEntryAndFeedDeserializer);
}
}
protected override bool ReadAtEntryEndImplementation()
{
bool isTopLevel = base.IsTopLevel;
bool isExpandedLinkContent = base.IsExpandedLinkContent;
bool emptyInline = base.CurrentEntry == null;
base.PopScope(ODataReaderState.EntryEnd);
if (!emptyInline)
{
bool flag4 = false;
if (this.atomInputContext.MessageReaderSettings.ReaderBehavior.EntryXmlCustomizationCallback != null)
{
XmlReader objB = this.atomInputContext.PopCustomReader();
if (!object.ReferenceEquals(this.atomInputContext.XmlReader, objB))
{
flag4 = true;
this.atomEntryAndFeedDeserializersStack.Pop();
this.atomEntryAndFeedDeserializer = this.atomEntryAndFeedDeserializersStack.Peek();
}
}
if (!flag4)
{
this.atomEntryAndFeedDeserializer.ReadEntryEnd();
}
}
bool flag5 = true;
if (isTopLevel)
{
this.atomEntryAndFeedDeserializer.ReadPayloadEnd();
this.ReplaceScope(ODataReaderState.Completed);
return false;
}
if (isExpandedLinkContent)
{
this.atomEntryAndFeedDeserializer.ReadNavigationLinkContentAfterExpansion(emptyInline);
this.ReplaceScope(ODataReaderState.NavigationLinkEnd);
return flag5;
}
if (this.atomEntryAndFeedDeserializer.ReadFeedContent(this.CurrentFeedState, base.IsExpandedLinkContent))
{
this.ReadEntryStart();
return flag5;
}
this.ReplaceScope(ODataReaderState.FeedEnd);
return flag5;
}
private void ReadEntryStart()
{
ODataEntry entry = ReaderUtils.CreateNewEntry();
if (this.atomInputContext.MessageReaderSettings.ReaderBehavior.EntryXmlCustomizationCallback != null)
{
this.atomEntryAndFeedDeserializer.VerifyEntryStart();
Uri xmlBaseUri = this.atomInputContext.XmlReader.XmlBaseUri;
XmlReader objB = this.atomInputContext.MessageReaderSettings.ReaderBehavior.EntryXmlCustomizationCallback(entry, this.atomInputContext.XmlReader, this.atomInputContext.XmlReader.ParentXmlBaseUri);
if (objB != null)
{
if (object.ReferenceEquals(this.atomInputContext.XmlReader, objB))
{
throw new ODataException(Microsoft.Data.OData.Strings.ODataAtomReader_EntryXmlCustomizationCallbackReturnedSameInstance);
}
this.atomInputContext.PushCustomReader(objB, xmlBaseUri);
this.atomEntryAndFeedDeserializer = new ODataAtomEntryAndFeedDeserializer(this.atomInputContext);
this.atomEntryAndFeedDeserializersStack.Push(this.atomEntryAndFeedDeserializer);
}
else
{
this.atomInputContext.PushCustomReader(this.atomInputContext.XmlReader, null);
}
}
this.atomEntryAndFeedDeserializer.ReadEntryStart(entry);
this.EnterScope(ODataReaderState.EntryStart, entry, base.CurrentEntityType);
AtomScope currentScope = (AtomScope) base.CurrentScope;
currentScope.DuplicatePropertyNamesChecker = this.atomInputContext.CreateDuplicatePropertyNamesChecker();
string entityTypeNameFromPayload = this.atomEntryAndFeedDeserializer.FindTypeName();
base.ApplyEntityTypeNameFromPayload(entityTypeNameFromPayload);
if (base.CurrentFeedValidator != null)
{
base.CurrentFeedValidator.ValidateEntry(base.CurrentEntityType);
}
ODataEntityPropertyMappingCache cache = this.atomInputContext.Model.EnsureEpmCache(this.CurrentEntryState.EntityType, 0x7fffffff);
if (cache != null)
{
currentScope.CachedEpm = cache;
}
if (this.atomEntryAndFeedDeserializer.XmlReader.IsEmptyElement)
{
this.CurrentEntryState.EntryElementEmpty = true;
}
else
{
this.atomEntryAndFeedDeserializer.XmlReader.Read();
if (this.atomInputContext.UseServerApiBehavior)
{
this.CurrentEntryState.FirstNavigationLinkDescriptor = null;
}
else
{
this.CurrentEntryState.FirstNavigationLinkDescriptor = this.atomEntryAndFeedDeserializer.ReadEntryContent(this.CurrentEntryState);
}
}
}
/// <summary>
/// Reads the start of an entry and sets up the reader state correctly.
/// </summary>
/// <remarks>
/// Pre-Condition: XmlNodeType.Element - The method will fail if it's not atom:entry.
/// Post-Condition: XmlNodeType.Element (empty) atom:entry - The entry element when reading entry and the entry element is empty.
/// XmlNodeType.EndElement atom:entry - The end element of the entry (if there were no nav. links. in it)
/// XmlNodeType.Element atom:link - The start tag of the atom:link which represents the first navigation link in the entry.
/// </remarks>
private void ReadEntryStart()
{
this.atomEntryAndFeedDeserializer.AssertXmlCondition(XmlNodeType.Element);
ODataEntry entry = ReaderUtils.CreateNewEntry();
if (this.atomInputContext.MessageReaderSettings.AtomEntryXmlCustomizationCallback != null)
{
this.atomEntryAndFeedDeserializer.VerifyEntryStart();
// Note that we're passing in the buffering reader positioned on the atom:entry element, but that element might have been already buffered
// although the reader is currently not in buffering mode.
// We must remember the base URI, since we use it as the starting xml:base for the wrapped buffering reader over the reader returned
// from the customization callback;
Uri entryXmlBaseUri = this.atomInputContext.XmlReader.XmlBaseUri;
this.atomInputContext.XmlReader.AssertNotBuffering();
XmlReader entryReader = this.atomInputContext.MessageReaderSettings.AtomEntryXmlCustomizationCallback(
entry,
this.atomInputContext.XmlReader,
this.atomInputContext.XmlReader.ParentXmlBaseUri);
if (entryReader != null)
{
if (object.ReferenceEquals(this.atomInputContext.XmlReader, entryReader))
{
throw new ODataException(o.Strings.ODataAtomReader_EntryXmlCustomizationCallbackReturnedSameInstance);
}
// Push the new reader.
// We need to use the xml:base from the entry element itself, since the inner reader starts on that element
// and thus our wrapping reader will not see that element again and will not read it's xml:base value for the stack.
this.atomInputContext.PushCustomReader(entryReader, entryXmlBaseUri);
// And push a new deserializer.
this.atomEntryAndFeedDeserializer = new ODataAtomEntryAndFeedDeserializer(this.atomInputContext);
this.atomEntryAndFeedDeserializersStack.Push(this.atomEntryAndFeedDeserializer);
}
else
{
// Push the same reader so that we know that customization didn't happen at this level.
this.atomInputContext.PushCustomReader(this.atomInputContext.XmlReader, /*xmlBaseUri*/ null);
}
}
// Read the start of the entry (etag and type name)
this.atomEntryAndFeedDeserializer.ReadEntryStart(entry);
// Setup the new entry state
this.EnterScope(ODataReaderState.EntryStart, entry, this.CurrentEntityType);
AtomScope entryScope = (AtomScope)this.CurrentScope;
entryScope.DuplicatePropertyNamesChecker = this.atomInputContext.CreateDuplicatePropertyNamesChecker();
// Read ahead to detect the type name and use it.
string typeNameFromPayload = this.atomEntryAndFeedDeserializer.FindTypeName();
this.ApplyEntityTypeNameFromPayload(typeNameFromPayload);
// Validate type with feed validator if available
if (this.CurrentFeedValidator != null)
{
this.CurrentFeedValidator.ValidateEntry(this.CurrentEntityType);
}
// NOTE: when reading, we assume the model has been validated already and thus pass int.MaxValue for the maxMappingCount.
ODataEntityPropertyMappingCache cachedEpm = this.atomInputContext.Model.EnsureEpmCache(this.CurrentEntryState.EntityType, /*maxMappingCount*/ int.MaxValue);
if (cachedEpm != null)
{
entryScope.CachedEpm = cachedEpm;
}
Debug.Assert(
this.atomEntryAndFeedDeserializer.XmlReader.NodeType == XmlNodeType.Element &&
this.atomEntryAndFeedDeserializer.XmlReader.LocalName == AtomConstants.AtomEntryElementName &&
this.atomEntryAndFeedDeserializer.XmlReader.NamespaceURI == AtomConstants.AtomNamespace,
"The XML reader must be on the atom:entry element by now.");
if (this.atomEntryAndFeedDeserializer.XmlReader.IsEmptyElement)
{
// If the entry element is empty, remember that so that we can easily decide what to do next time the reader is called.
this.CurrentEntryState.EntryElementEmpty = true;
}
else
{
// Move to the first child node of the entry
this.atomEntryAndFeedDeserializer.XmlReader.Read();
if (this.atomInputContext.UseServerApiBehavior)
{
this.CurrentEntryState.FirstNavigationLinkDescriptor = null;
}
else
{
// Read the entry content.
// If we find a nav. link, store it on the scope for reporting once we report the entry itself.
this.CurrentEntryState.FirstNavigationLinkDescriptor = this.atomEntryAndFeedDeserializer.ReadEntryContent(this.CurrentEntryState);
}
}
}
/// <summary>
/// Implementation of the reader logic when in state 'EntryEnd'.
/// </summary>
/// <returns>true if more items can be read from the reader; otherwise false.</returns>
/// <remarks>
/// Pre-Condition: XmlNodeType.Element (empty) atom:entry - The empty start tag of atom:entry.
/// XmlNodeType.EndElement atom:entry - The end element of the atom:entry.
/// XmlNodeType.Element (empty) m:inline - the empty m:inline element of an expanded null entry.
/// XmlNodeType.EndElement m:inline - the end element m:inline of an expanded null entry.
/// Post-Condition: Any - The node right after the top-level atom:entry element.
/// XmlNodeType.EndElement atom:feed - The end element of the parent feed for the entry.
/// XmlNodeType.Element (empty) atom:entry - The empty start tag of the next entry in the parent feed.
/// XmlNodeType.EndElement atom:entry - The end element of the next entry in the parent feed (if it had no nav. links).
/// XmlNodeType.Element atom:link - The start tag of the atom:link which represents the first navigation link in the next entry in the parent feed.
/// XmlNodeType.EndElement atom:link - The end of parent expanded link.
/// </remarks>
protected override bool ReadAtEntryEndImplementation()
{
bool isTopLevel = this.IsTopLevel;
bool isExpandedLinkContent = this.IsExpandedLinkContent;
bool isNullEntry = this.CurrentEntry == null;
this.PopScope(ODataReaderState.EntryEnd);
Debug.Assert(!isNullEntry || isExpandedLinkContent, "Null entry can only occure inside an expanded link.");
if (!isNullEntry)
{
bool entryXmlCustomizationUsed = false;
if (this.atomInputContext.MessageReaderSettings.AtomEntryXmlCustomizationCallback != null)
{
XmlReader entryReader = this.atomInputContext.PopCustomReader();
if (!object.ReferenceEquals(this.atomInputContext.XmlReader, entryReader))
{
entryXmlCustomizationUsed = true;
// Pop the deserializer so that we use the one for the parent reader from now on.
this.atomEntryAndFeedDeserializersStack.Pop();
this.atomEntryAndFeedDeserializer = this.atomEntryAndFeedDeserializersStack.Peek();
}
}
// We assume that if the customization was used, then the parent reader was moved to after the end-element (empty start-element)
// only if no customization was used we need to read over it here (note that we leave it on the end-element when we report the EndEntry
// so that streaming scenarios work as expected, that is reading one entry reads just that from the stream and not a byte more).
if (!entryXmlCustomizationUsed)
{
// Read over the end element (or the empty start element)
this.atomEntryAndFeedDeserializer.ReadEntryEnd();
}
}
bool result = true;
if (isTopLevel)
{
Debug.Assert(this.State == ODataReaderState.Start, "this.State == ODataReaderState.Start");
// Read the end of the payload
this.atomEntryAndFeedDeserializer.ReadPayloadEnd();
// replace the 'Start' scope with the 'Completed' scope
this.ReplaceScope(ODataReaderState.Completed);
result = false;
}
else if (isExpandedLinkContent)
{
#if DEBUG
if (isNullEntry)
{
this.atomEntryAndFeedDeserializer.AssertXmlCondition(true, XmlNodeType.EndElement);
Debug.Assert(
this.atomEntryAndFeedDeserializer.XmlReader.LocalName == AtomConstants.ODataInlineElementName &&
this.atomEntryAndFeedDeserializer.XmlReader.NamespaceURI == AtomConstants.ODataMetadataNamespace,
"The reader must be positied on the m:inline empty start tag, or end element");
}
#endif
this.atomEntryAndFeedDeserializer.ReadNavigationLinkContentAfterExpansion(isNullEntry);
// replace the 'NavigationLinkStart' scope with the 'NavigationLinkEnd' scope
Debug.Assert(this.CurrentScope.State == ODataReaderState.NavigationLinkStart, "Should be in NavigationLinkStart state.");
this.ReplaceScope(ODataReaderState.NavigationLinkEnd);
}
else
{
// End of entry in a feed
Debug.Assert(this.State == ODataReaderState.FeedStart, "Expected reader to be in state feed start before reading the next entry.");
// Continue reading the content of the parent feed
if (this.atomEntryAndFeedDeserializer.ReadFeedContent(this.CurrentFeedState, this.IsExpandedLinkContent))
{
this.atomEntryAndFeedDeserializer.AssertXmlCondition(XmlNodeType.Element);
Debug.Assert(
this.atomEntryAndFeedDeserializer.XmlReader.LocalName == AtomConstants.AtomEntryElementName &&
this.atomEntryAndFeedDeserializer.XmlReader.NamespaceURI == AtomConstants.AtomNamespace,
"The reader must be on the start element of atom:entry.");
// Found another entry in the feed
this.ReadEntryStart();
}
else
{
this.atomEntryAndFeedDeserializer.AssertXmlCondition(XmlNodeType.EndElement);
Debug.Assert(
this.atomEntryAndFeedDeserializer.XmlReader.LocalName == AtomConstants.AtomFeedElementName &&
this.atomEntryAndFeedDeserializer.XmlReader.NamespaceURI == AtomConstants.AtomNamespace,
"The reader must be on the end element of atom:feed.");
// End of the parent feed
this.ReplaceScope(ODataReaderState.FeedEnd);
}
}
return result;
}
