public override void WriteStart(DataServiceODataWriterNavigationLinkArgs args)
{
var current = new CustomInstanceAnnotationsDescriptor {
TypeOfAnnotatedItem = typeof(ODataNavigationLink)
};
writtenItemsStack.Push(current);
base.WriteStart(args);
}
public override void WriteEnd(DataServiceODataWriterNavigationLinkArgs args)
{
if (WriteLinkEnd.Value != null)
{
if (WriteLinkEnd.Value(args))
{
return;
}
}
base.WriteEnd(args);
}
private void WriteNavigationProperties(IExpandedResult expanded, EntityToSerialize entityToSerialize, bool resourceInstanceInFeed, IEnumerable <ProjectionNode> projectionNodesForCurrentResourceType)
{
Debug.Assert(entityToSerialize != null, "entityToSerialize != null");
Debug.Assert(
projectionNodesForCurrentResourceType == null ||
projectionNodesForCurrentResourceType.All(projectionNode => projectionNode.TargetResourceType.IsAssignableFrom(entityToSerialize.ResourceType)),
"The projection nodes must be filtered to the current resource type only.");
IEnumerable <ResourceProperty> navProperties =
projectionNodesForCurrentResourceType == null
? this.Provider.GetResourceSerializableProperties(this.CurrentContainer, entityToSerialize.ResourceType).Where(p => p.TypeKind == ResourceTypeKind.EntityType)
: projectionNodesForCurrentResourceType.Where(p => p.Property != null && p.Property.TypeKind == ResourceTypeKind.EntityType).Select(p1 => p1.Property);
foreach (ResourceProperty property in navProperties)
{
ResourcePropertyInfo navProperty = this.GetNavigationPropertyInfo(expanded, entityToSerialize.Entity, entityToSerialize.ResourceType, property);
ODataNavigationLink navLink = this.GetNavigationLink(entityToSerialize, navProperty.Property);
// WCF Data Services show performance degradation with JsonLight when entities have > 25 Navgations on writing entries
// DEVNOTE: for performance reasons, if the link has no content due to the metadata level, and is not expanded
// then don't tell ODataLib about it at all.
if (navLink.Url == null && navLink.AssociationLinkUrl == null && !navProperty.Expand)
{
continue;
}
var linkArgs = new DataServiceODataWriterNavigationLinkArgs(navLink, this.Service.OperationContext);
this.dataServicesODataWriter.WriteStart(linkArgs);
if (navProperty.Expand)
{
object navPropertyValue = navProperty.Value;
IExpandedResult navPropertyExpandedResult = navPropertyValue as IExpandedResult;
object expandedPropertyValue =
navPropertyExpandedResult != null?
GetExpandedElement(navPropertyExpandedResult) :
navPropertyValue;
bool needPop = this.PushSegmentForProperty(navProperty.Property, entityToSerialize.ResourceType, navProperty.ExpandedNode);
// if this.CurrentContainer is null, the target set of the navigation property is hidden.
if (this.CurrentContainer != null)
{
if (navProperty.Property.Kind == ResourcePropertyKind.ResourceSetReference)
{
IEnumerable enumerable;
bool collection = WebUtil.IsElementIEnumerable(expandedPropertyValue, out enumerable);
Debug.Assert(collection, "metadata loading must have ensured that navigation set properties must implement IEnumerable");
QueryResultInfo queryResults = new QueryResultInfo(enumerable);
try
{
queryResults.MoveNext();
Func <Uri> getNavPropertyRelativeUri = () => RequestUriProcessor.AppendUnescapedSegment(entityToSerialize.SerializedKey.RelativeEditLink, navLink.Name);
Func <Uri> getNavPropertyAbsoluteUri = () => RequestUriProcessor.AppendUnescapedSegment(entityToSerialize.SerializedKey.AbsoluteEditLink, navLink.Name);
this.WriteFeedElements(navPropertyExpandedResult, queryResults, navProperty.Property.ResourceType, navLink.Name, getNavPropertyRelativeUri, getNavPropertyAbsoluteUri, false);
}
finally
{
// After the navigation property is completely serialized, dispose the property value.
WebUtil.Dispose(queryResults);
}
}
else if (WebUtil.IsNullValue(expandedPropertyValue))
{
// Write a null reference navigation property
var entryArgs = new DataServiceODataWriterEntryArgs(null, null, this.Service.OperationContext);
this.dataServicesODataWriter.WriteStart(entryArgs);
this.dataServicesODataWriter.WriteEnd(entryArgs);
}
else
{
this.WriteEntry(navPropertyExpandedResult, expandedPropertyValue, resourceInstanceInFeed, navProperty.Property.ResourceType);
}
}
this.PopSegmentName(needPop);
}
this.dataServicesODataWriter.WriteEnd(linkArgs); // end of navigation property
}
}
private void WriteNavigationProperties(IExpandedResult expanded, EntityToSerialize entityToSerialize, bool resourceInstanceInFeed, IEnumerable<ProjectionNode> projectionNodesForCurrentResourceType)
{
Debug.Assert(entityToSerialize != null, "entityToSerialize != null");
Debug.Assert(
projectionNodesForCurrentResourceType == null ||
projectionNodesForCurrentResourceType.All(projectionNode => projectionNode.TargetResourceType.IsAssignableFrom(entityToSerialize.ResourceType)),
"The projection nodes must be filtered to the current resource type only.");
IEnumerable<ResourceProperty> navProperties =
projectionNodesForCurrentResourceType == null
? this.Provider.GetResourceSerializableProperties(this.CurrentContainer, entityToSerialize.ResourceType).Where(p => p.TypeKind == ResourceTypeKind.EntityType)
: projectionNodesForCurrentResourceType.Where(p => p.Property != null && p.Property.TypeKind == ResourceTypeKind.EntityType).Select(p1 => p1.Property);
foreach (ResourceProperty property in navProperties)
{
ResourcePropertyInfo navProperty = this.GetNavigationPropertyInfo(expanded, entityToSerialize.Entity, entityToSerialize.ResourceType, property);
ODataNavigationLink navLink = this.GetNavigationLink(entityToSerialize, navProperty.Property);
// WCF Data Services show performance degradation with JsonLight when entities have > 25 Navgations on writing entries
// DEVNOTE: for performance reasons, if the link has no content due to the metadata level, and is not expanded
// then don't tell ODataLib about it at all.
if (navLink.Url == null && navLink.AssociationLinkUrl == null && !navProperty.Expand)
{
continue;
}
var linkArgs = new DataServiceODataWriterNavigationLinkArgs(navLink, this.Service.OperationContext);
this.dataServicesODataWriter.WriteStart(linkArgs);
if (navProperty.Expand)
{
object navPropertyValue = navProperty.Value;
IExpandedResult navPropertyExpandedResult = navPropertyValue as IExpandedResult;
object expandedPropertyValue =
navPropertyExpandedResult != null ?
GetExpandedElement(navPropertyExpandedResult) :
navPropertyValue;
bool needPop = this.PushSegmentForProperty(navProperty.Property, entityToSerialize.ResourceType, navProperty.ExpandedNode);
// if this.CurrentContainer is null, the target set of the navigation property is hidden.
if (this.CurrentContainer != null)
{
if (navProperty.Property.Kind == ResourcePropertyKind.ResourceSetReference)
{
IEnumerable enumerable;
bool collection = WebUtil.IsElementIEnumerable(expandedPropertyValue, out enumerable);
Debug.Assert(collection, "metadata loading must have ensured that navigation set properties must implement IEnumerable");
QueryResultInfo queryResults = new QueryResultInfo(enumerable);
try
{
queryResults.MoveNext();
Func<Uri> getNavPropertyRelativeUri = () => RequestUriProcessor.AppendUnescapedSegment(entityToSerialize.SerializedKey.RelativeEditLink, navLink.Name);
Func<Uri> getNavPropertyAbsoluteUri = () => RequestUriProcessor.AppendUnescapedSegment(entityToSerialize.SerializedKey.AbsoluteEditLink, navLink.Name);
this.WriteFeedElements(navPropertyExpandedResult, queryResults, navProperty.Property.ResourceType, navLink.Name, getNavPropertyRelativeUri, getNavPropertyAbsoluteUri, false);
}
finally
{
// After the navigation property is completely serialized, dispose the property value.
WebUtil.Dispose(queryResults);
}
}
else if (WebUtil.IsNullValue(expandedPropertyValue))
{
// Write a null reference navigation property
var entryArgs = new DataServiceODataWriterEntryArgs(null, null, this.Service.OperationContext);
this.dataServicesODataWriter.WriteStart(entryArgs);
this.dataServicesODataWriter.WriteEnd(entryArgs);
}
else
{
this.WriteEntry(navPropertyExpandedResult, expandedPropertyValue, resourceInstanceInFeed, navProperty.Property.ResourceType);
}
}
this.PopSegmentName(needPop);
}
this.dataServicesODataWriter.WriteEnd(linkArgs); // end of navigation property
}
}