/// <exception cref="System.IO.IOException"></exception>
private RefUpdate.Result UpdateImpl(RevWalk walk, RefUpdate.Store store)
{
RevObject newObj;
RevObject oldObj;
if (GetRefDatabase().IsNameConflicting(GetName()))
{
return RefUpdate.Result.LOCK_FAILURE;
}
try
{
if (!TryLock(true))
{
return RefUpdate.Result.LOCK_FAILURE;
}
if (expValue != null)
{
ObjectId o;
o = oldValue != null ? oldValue : ObjectId.ZeroId;
if (!AnyObjectId.Equals(expValue, o))
{
return RefUpdate.Result.LOCK_FAILURE;
}
}
if (oldValue == null)
{
return store.Execute(RefUpdate.Result.NEW);
}
newObj = SafeParse(walk, newValue);
oldObj = SafeParse(walk, oldValue);
if (newObj == oldObj && !detachingSymbolicRef)
{
return store.Execute(RefUpdate.Result.NO_CHANGE);
}
if (newObj is RevCommit && oldObj is RevCommit)
{
if (walk.IsMergedInto((RevCommit)oldObj, (RevCommit)newObj))
{
return store.Execute(RefUpdate.Result.FAST_FORWARD);
}
}
if (IsForceUpdate())
{
return store.Execute(RefUpdate.Result.FORCED);
}
return RefUpdate.Result.REJECTED;
}
finally
{
Unlock();
}
}