private uSyncChange TrackSingleItem(TrackingItem item, XElement target, XElement source, TrackingDirection direction)
{
var sourceNode = source.XPathSelectElement(item.Path);
var targetNode = target.XPathSelectElement(item.Path);
if (sourceNode != null)
{
if (targetNode == null)
{
// value is missing, this is a delete or create depending on compare direction
return(AddMissingChange(item.Path, item.Name, sourceNode.ValueOrDefault(string.Empty), direction));
}
// only track updates when tracking target to source.
else if (direction == TrackingDirection.TargetToSource)
{
if (item.HasAttributes())
{
return(Compare(targetNode.Attribute(item.AttributeKey).ValueOrDefault(string.Empty),
sourceNode.Attribute(item.AttributeKey).ValueOrDefault(string.Empty),
item.Path, item.Name, item.MaskValue));
}
else
{
return(Compare(targetNode.ValueOrDefault(string.Empty),
sourceNode.ValueOrDefault(string.Empty),
item.Path, item.Name, item.MaskValue));
}
}
}
return(null);
}
private IEnumerable <uSyncChange> TrackMultipleKeyedItems(TrackingItem trackingItem, XElement target, XElement source, TrackingDirection direction)
{
var changes = new List <uSyncChange>();
var sourceItems = source.XPathSelectElements(trackingItem.Path);
foreach (var sourceNode in sourceItems)
{
// make the selection path for this item.
var itemPath = trackingItem.Path.Replace("*", sourceNode.Parent.Name.LocalName) + MakeSelectionPath(sourceNode, trackingItem.Keys);
var itemName = trackingItem.Name.Replace("*", sourceNode.Parent.Name.LocalName) +
MakeSelectionName(sourceNode, String.IsNullOrWhiteSpace(trackingItem.ValueKey) ? trackingItem.Keys : trackingItem.ValueKey);
var targetNode = target.XPathSelectElement(itemPath);
if (targetNode == null)
{
var value = sourceNode.ValueOrDefault(string.Empty);
if (!string.IsNullOrEmpty(trackingItem.ValueKey))
{
value = GetKeyValue(sourceNode, trackingItem.ValueKey);
}
// missing, we add either a delete or create - depending on tracking direction
changes.AddNotNull(AddMissingChange(trackingItem.Path, itemName, value, direction));
}
// only track updates when tracking target to source.
else if (direction == TrackingDirection.TargetToSource)
{
// check the node to see if its an update.
changes.AddRange(CompareNode(targetNode, sourceNode, trackingItem.Path, itemName, trackingItem.MaskValue));
}
}
return(changes);
}