public NodeMergeResult Merge(XmlNode ourParent, XmlNode ours, XmlNode theirs, XmlNode ancestor)
{
SendMergeHeartbeat();
if (ours == null && theirs == null && ancestor == null)
{
throw new InvalidOperationException("At least one node has to exist.");
}
var result = new NodeMergeResult();
var listener = EventListener as DispatchingMergeEventListener;
if (listener == null)
{
var dispatcher = new DispatchingMergeEventListener();
dispatcher.AddEventListener(result);
if (EventListener != null)
{
dispatcher.AddEventListener(EventListener);
}
EventListener = dispatcher;
}
else
{
listener.AddEventListener(result);
}
if (XmlMergeService.RemoveAmbiguousChildNodes)
{
// Remove any duplicate child nodes in all three.
XmlMergeService.RemoveAmbiguousChildren(EventListener, MergeStrategies, ours);
XmlMergeService.RemoveAmbiguousChildren(EventListener, MergeStrategies, theirs);
XmlMergeService.RemoveAmbiguousChildren(EventListener, MergeStrategies, ancestor);
}
if (ancestor == null)
{
if (ours == null)
{
// tested
EventListener.ChangeOccurred(new XmlAdditionChangeReport(MergeSituation.PathToFileInRepository, theirs));
result.MergedNode = theirs;
}
else if (theirs == null)
{
// tested
EventListener.ChangeOccurred(new XmlAdditionChangeReport(MergeSituation.PathToFileInRepository, ours));
result.MergedNode = ours;
}
else
{
// Both added.
if (XmlUtilities.AreXmlElementsEqual(ours, theirs))
{
// Same thing. (tested)
EventListener.ChangeOccurred(new XmlBothAddedSameChangeReport(MergeSituation.PathToFileInRepository, ours));
result.MergedNode = ours;
}
else
{
// But, not the same thing.
if (MergeSituation.ConflictHandlingMode == MergeOrder.ConflictHandlingModeChoices.WeWin)
{
// tested
ConflictOccurred(new BothAddedMainElementButWithDifferentContentConflict(ours.Name, ours, theirs, MergeSituation, MergeStrategies.GetElementStrategy(ours), MergeSituation.AlphaUserId));
result.MergedNode = ours;
}
else
{
// tested
ConflictOccurred(new BothAddedMainElementButWithDifferentContentConflict(theirs.Name, theirs, ours, MergeSituation, MergeStrategies.GetElementStrategy(ours), MergeSituation.BetaUserId));
result.MergedNode = theirs;
}
}
}
return(result);
}
// ancestor exists
if (ours == null && theirs == null)
{
// tested
EventListener.ChangeOccurred(new XmlBothDeletionChangeReport(MergeSituation.PathToFileInRepository, ancestor));
result.MergedNode = null;
return(result);
}
if (ours == null)
{
if (XmlUtilities.AreXmlElementsEqual(ancestor, theirs))
{
// tested
EventListener.ChangeOccurred(new XmlDeletionChangeReport(MergeSituation.PathToFileInRepository, ancestor, theirs));
result.MergedNode = null;
}
else
{
// tested
ConflictOccurred(new RemovedVsEditedElementConflict(ancestor.Name, null, theirs, ancestor, MergeSituation, MergeStrategies.GetElementStrategy(ancestor), MergeSituation.BetaUserId));
result.MergedNode = theirs;
}
return(result);
}
if (theirs == null)
{
if (XmlUtilities.AreXmlElementsEqual(ancestor, ours))
{
// tested
EventListener.ChangeOccurred(new XmlDeletionChangeReport(MergeSituation.PathToFileInRepository, ancestor, ours));
result.MergedNode = null;
}
else
{
// tested
ConflictOccurred(new EditedVsRemovedElementConflict(ancestor.Name, ours, null, ancestor, MergeSituation, MergeStrategies.GetElementStrategy(ancestor), MergeSituation.AlphaUserId));
result.MergedNode = ours;
}
return(result);
}
// All three nodes exist.
MergeInner(ourParent, ref ours, theirs, ancestor);
result.MergedNode = ours;
return(result);
}