/// <summary>
/// Read the deleted resource.
/// </summary>
/// <param name="reader">The OData reader.</param>
/// <param name="itemsStack">The item stack.</param>
private static void ReadDeletedResource(ODataReader reader, Stack <ODataItemWrapper> itemsStack)
{
Contract.Assert(reader != null);
Contract.Assert(itemsStack != null);
Contract.Assert(ODataReaderState.DeletedResourceStart == reader.State);
ODataDeletedResource deletedResource = (ODataDeletedResource)reader.Item;
Contract.Assert(deletedResource != null, "Deleted resource should not be null");
ODataDeletedResourceWrapper deletedResourceWrapper = new ODataDeletedResourceWrapper(deletedResource);
// top-level resource should never be deleted.
Contract.Assert(itemsStack.Count != 0, "Deleted Resource should not be top level item");
ODataItemWrapper parentItem = itemsStack.Peek();
ODataDeltaResourceSetWrapper parentDeletaResourceSet = parentItem as ODataDeltaResourceSetWrapper;
if (parentDeletaResourceSet != null)
{
parentDeletaResourceSet.DeltaItems.Add(deletedResourceWrapper);
}
else
{
ODataNestedResourceInfoWrapper parentNestedResource = (ODataNestedResourceInfoWrapper)itemsStack.Peek();
Contract.Assert(parentNestedResource.NestedResourceInfo.IsCollection == false, "Only singleton nested properties can contain resource as their child.");
Contract.Assert(parentNestedResource.NestedResourceSet == null, "Each single nested property can not contain resource set.");
Contract.Assert(parentNestedResource.NestedResource == null, "Each single nested property can not contain multiple resources as its direct child.");
Contract.Assert(parentNestedResource.NestedLinks == null, "Each single nested property can not contain reference link as its direct child.");
parentNestedResource.NestedResource = deletedResourceWrapper;
}
itemsStack.Push(deletedResourceWrapper);
}
/// <summary>
/// Read OData item.
/// </summary>
/// <param name="reader">The odata reader.</param>
/// <param name="itemsStack">The item stack.</param>
/// <param name="topLevelItem">The top level item.</param>
private static void ReadODataItem(ODataReader reader, Stack <ODataItemWrapper> itemsStack, ref ODataItemWrapper topLevelItem)
{
Contract.Assert(reader != null);
Contract.Assert(itemsStack != null);
switch (reader.State)
{
case ODataReaderState.ResourceStart:
ReadResource(reader, itemsStack, ref topLevelItem);
break;
case ODataReaderState.DeletedResourceStart:
ReadDeletedResource(reader, itemsStack);
break;
case ODataReaderState.ResourceEnd:
Contract.Assert(itemsStack.Count > 0, "The resource which is ending should be on the top of the items stack.");
ODataResourceWrapper resourceWrapper = itemsStack.Peek() as ODataResourceWrapper;
if (resourceWrapper != null)
{
// Resource could be null
Contract.Assert(resourceWrapper.Resource == reader.Item, "The resource should be the same item in the reader.");
}
itemsStack.Pop();
break;
case ODataReaderState.DeletedResourceEnd:
Contract.Assert(itemsStack.Count > 0, "The deleted resource which is ending should be on the top of the items stack.");
ODataDeletedResourceWrapper deletedResourceWrapper = itemsStack.Peek() as ODataDeletedResourceWrapper;
Contract.Assert(deletedResourceWrapper != null, "The top object in the stack should be delete resource wrapper.");
Contract.Assert(deletedResourceWrapper.DeletedResource == reader.Item, "The deleted resource should be the same item in the reader.");
itemsStack.Pop();
break;
case ODataReaderState.NestedResourceInfoStart:
ODataNestedResourceInfo nestedResourceInfo = (ODataNestedResourceInfo)reader.Item;
Contract.Assert(nestedResourceInfo != null, "nested resource info should never be null.");
ODataNestedResourceInfoWrapper nestedResourceInfoWrapper = new ODataNestedResourceInfoWrapper(nestedResourceInfo);
Contract.Assert(itemsStack.Count > 0, "nested resource info can't appear as top-level item.");
{
ODataResourceBaseWrapper parentResource = (ODataResourceBaseWrapper)itemsStack.Peek();
parentResource.NestedResourceInfos.Add(nestedResourceInfoWrapper);
}
itemsStack.Push(nestedResourceInfoWrapper);
break;
case ODataReaderState.NestedResourceInfoEnd:
Contract.Assert(itemsStack.Count > 0, "The nested resource info which is ending should be on the top of the items stack.");
ODataNestedResourceInfoWrapper nestedInfoWrapper = itemsStack.Peek() as ODataNestedResourceInfoWrapper;
Contract.Assert(nestedInfoWrapper != null, "The top object in the stack should be nested resource info wrapper.");
Contract.Assert(nestedInfoWrapper.NestedResourceInfo == reader.Item, "The nested resource info should be the same item in the reader.");
itemsStack.Pop();
break;
case ODataReaderState.ResourceSetStart: // resource set
ReadResourceSet(reader, itemsStack, ref topLevelItem);
break;
case ODataReaderState.DeltaResourceSetStart: // delta resource set
ReadDeltaResourceSet(reader, itemsStack, ref topLevelItem);
break;
case ODataReaderState.ResourceSetEnd:
Contract.Assert(itemsStack.Count > 0, "The resource set which is ending should be on the top of the items stack.");
ODataResourceSetWrapper resourceSetWrapper = itemsStack.Peek() as ODataResourceSetWrapper;
Contract.Assert(resourceSetWrapper != null, "The top object in the stack should be resource set wrapper.");
Contract.Assert(resourceSetWrapper.ResourceSet == reader.Item, "The resource set should be the same item in the reader.");
itemsStack.Pop();
break;
case ODataReaderState.DeltaResourceSetEnd:
Contract.Assert(itemsStack.Count > 0, "The delta resource set which is ending should be on the top of the items stack.");
ODataDeltaResourceSetWrapper deltaResourceSetWrapper = itemsStack.Peek() as ODataDeltaResourceSetWrapper;
Contract.Assert(deltaResourceSetWrapper != null, "The top object in the stack should be delta resource set wrapper.");
Contract.Assert(deltaResourceSetWrapper.DeltaResourceSet == reader.Item, "The delta resource set should be the same item in the reader.");
itemsStack.Pop();
break;
case ODataReaderState.EntityReferenceLink:
ODataEntityReferenceLink entityReferenceLink = (ODataEntityReferenceLink)reader.Item;
Contract.Assert(entityReferenceLink != null, "Entity reference link should never be null.");
ODataEntityReferenceLinkWrapper entityReferenceLinkWrapper = new ODataEntityReferenceLinkWrapper(entityReferenceLink);
Contract.Assert(itemsStack.Count > 0, "Entity reference link should never be reported as top-level item.");
{
ODataNestedResourceInfoWrapper parentNestedResource = (ODataNestedResourceInfoWrapper)itemsStack.Peek();
Contract.Assert(parentNestedResource.NestedResourceSet == null, "Each reference nested property can not contain resource set as its direct child.");
Contract.Assert(parentNestedResource.NestedResource == null, "Each reference nested property can not contain resource as its direct child.");
parentNestedResource.AppendReferenceLink(entityReferenceLinkWrapper);
}
break;
case ODataReaderState.DeltaLink: // added link
case ODataReaderState.DeltaDeletedLink: // deleted link
ODataDeltaLinkBaseWrapper linkBaseWrapper;
if (ODataReaderState.DeltaLink == reader.State)
{
ODataDeltaLink deltaLink = (ODataDeltaLink)reader.Item;
Contract.Assert(deltaLink != null, "Delta link should never be null.");
linkBaseWrapper = new ODataDeltaLinkWrapper(deltaLink);
}
else
{
ODataDeltaDeletedLink deltaDeletedLink = (ODataDeltaDeletedLink)reader.Item;
Contract.Assert(deltaDeletedLink != null, "Delta deleted link should never be null.");
linkBaseWrapper = new ODataDeltaDeletedLinkWrapper(deltaDeletedLink);
}
Contract.Assert(itemsStack.Count > 0, "Delta link should never be reported as top-level item.");
// Should never add a delta link to a non-delta resource set.
ODataDeltaResourceSetWrapper linkResourceSetWrapper = (ODataDeltaResourceSetWrapper)itemsStack.Peek();
Contract.Assert(linkResourceSetWrapper != null, "ODataDeltaResourceSetWrapper for delta link should not be null.");
linkResourceSetWrapper.DeltaItems.Add(linkBaseWrapper);
break;
default:
Contract.Assert(false, "We should never get here, it means the ODataReader reported a wrong state.");
break;
}
}