/// <summary>Parses a link for the specified <paramref name="targetEntry"/>.</summary>
/// <param name="targetEntry">Entry to update with link information.</param>
private void ParseCurrentLink(AtomEntry targetEntry)
{
Debug.Assert(targetEntry != null, "targetEntry != null");
Debug.Assert(
this.reader.NodeType == XmlNodeType.Element,
"this.reader.NodeType == XmlNodeType.Element -- otherwise we shouldn't try to parse a link");
Debug.Assert(
this.reader.LocalName == "link",
"this.reader.LocalName == 'link' -- otherwise we shouldn't try to parse a link");
string propertyName = null;
string relation = this.reader.GetAttribute(XmlConstants.AtomLinkRelationAttributeName);
if (relation == null)
{
return;
}
if ((relation == XmlConstants.AtomEditRelationAttributeValue ||
XmlConstants.AtomEditRelationAttributeValue == UriUtil.GetNameFromAtomLinkRelationAttribute(relation, XmlConstants.IanaLinkRelationsNamespace))
&& targetEntry.EditLink == null)
{
// Only process the first link that has @rel='edit'.
string href = this.reader.GetAttribute(XmlConstants.AtomHRefAttributeName);
if (String.IsNullOrEmpty(href))
{
throw Error.InvalidOperation(Strings.Context_MissingEditLinkInResponseBody);
}
targetEntry.EditLink = this.ProcessUriFromPayload(href);
}
else if ((relation == XmlConstants.AtomSelfRelationAttributeValue ||
XmlConstants.AtomSelfRelationAttributeValue == UriUtil.GetNameFromAtomLinkRelationAttribute(relation, XmlConstants.IanaLinkRelationsNamespace))
&& targetEntry.QueryLink == null)
{
// Only process the first link that has @rel='self'.
string href = this.reader.GetAttribute(XmlConstants.AtomHRefAttributeName);
if (String.IsNullOrEmpty(href))
{
throw Error.InvalidOperation(Strings.Context_MissingSelfLinkInResponseBody);
}
targetEntry.QueryLink = this.ProcessUriFromPayload(href);
}
else if ((relation == XmlConstants.AtomEditMediaRelationAttributeValue ||
XmlConstants.AtomEditMediaRelationAttributeValue == UriUtil.GetNameFromAtomLinkRelationAttribute(relation, XmlConstants.IanaLinkRelationsNamespace))
&& targetEntry.MediaEditUri == null)
{
string href = this.reader.GetAttribute(XmlConstants.AtomHRefAttributeName);
if (String.IsNullOrEmpty(href))
{
throw Error.InvalidOperation(Strings.Context_MissingEditMediaLinkInResponseBody);
}
targetEntry.MediaEditUri = this.ProcessUriFromPayload(href);
targetEntry.EntityDescriptor.StreamETag = this.reader.GetAttribute(XmlConstants.AtomETagAttributeName, XmlConstants.DataWebMetadataNamespace);
}
else if ((propertyName = UriUtil.GetNameFromAtomLinkRelationAttribute(relation, XmlConstants.DataWebRelatedNamespace)) != null)
{
#region Read the navigation link from the href attribute and handle expanded entities, if any
bool isFeed = false;
string propertyValueText = this.reader.GetAttribute(XmlConstants.AtomTypeAttributeName);
if (!IsAllowedNavigationLinkType(propertyValueText, out isFeed))
{
return;
}
// Get the link for the navigation property from the href attribute
string href = this.reader.GetAttribute(XmlConstants.AtomHRefAttributeName);
if (String.IsNullOrEmpty(href))
{
throw Error.InvalidOperation(Strings.Context_MissingRelationshipLinkInResponseBody(propertyName));
}
// Add the link to the target entry so that we do use the link while querying the relationship
Uri uri = this.ProcessUriFromPayload(href);
targetEntry.AddNavigationLink(propertyName, uri, isFeed);
if (!this.reader.IsEmptyElement)
{
this.HandleExpandedNavigationProperties(targetEntry, propertyName, isFeed);
}
#endregion Read the navigation link from the href attribute and handle expanded entities, if any
}
else if ((propertyName = UriUtil.GetNameFromAtomLinkRelationAttribute(relation, XmlConstants.DataWebRelatedLinkNamespace)) != null)
{
string propertyValueText = this.reader.GetAttribute(XmlConstants.AtomTypeAttributeName);
// check type="application/xml"
if (!IsAllowedAssociationLinkType(propertyValueText))
{
return;
}
// Get the related link for the navigation property from the href attribute
string href = this.reader.GetAttribute(XmlConstants.AtomHRefAttributeName);
if (String.IsNullOrEmpty(href))
{
throw Error.InvalidOperation(Strings.Context_MissingRelationshipLinkInResponseBody(propertyName));
}
// Add the link to the target entry so that we do use the link while querying the association
Uri uri = this.ProcessUriFromPayload(href);
targetEntry.AddAssociationLink(propertyName, uri);
}
else if ((propertyName = UriUtil.GetNameFromAtomLinkRelationAttribute(relation, XmlConstants.DataWebMediaResourceEditNamespace)) != null)
{
this.ReadNamedStreamInfoFromLinkElement(targetEntry, propertyName, true/*editLink*/);
}
else if ((propertyName = UriUtil.GetNameFromAtomLinkRelationAttribute(relation, XmlConstants.DataWebMediaResourceNamespace)) != null)
{
this.ReadNamedStreamInfoFromLinkElement(targetEntry, propertyName, false/*editLink*/);
}
}
