static public DiffOperation Merge(DiffOperation left, DiffOperation right)
{
// Remove always trumps other operations
if (right is RemoveOperation)
{
return(right);
}
if (left is RemoveOperation)
{
return(left);
}
// Change operation trumps other operations and right changes take precedent
if (right is ChangeOperation)
{
return(right);
}
if (left is ChangeOperation)
{
return(left);
}
// Recurseively merge array and object ops
Debug.Assert(left.GetType() == right.GetType());
if (left is ChangeObjectOperation)
{
return(ChangeObjectOperation.Merge(left as ChangeObjectOperation, right as ChangeObjectOperation));
}
if (left is ChangePositionArrayOperation)
{
return(ChangePositionArrayOperation.Merge(left as ChangePositionArrayOperation, right as ChangePositionArrayOperation));
}
if (left is ChangeIdArrayOperation)
{
return(ChangeIdArrayOperation.Merge(left as ChangeIdArrayOperation, right as ChangeIdArrayOperation));
}
Debug.Assert(false);
return(null);
}
public static ChangePositionArrayOperation Merge(ChangePositionArrayOperation left, ChangePositionArrayOperation right)
{
return(new ChangePositionArrayOperation(ListDiff.Merge(left.Diff, right.Diff)));
}
public static ChangePositionArrayOperation Merge(ChangePositionArrayOperation left, ChangePositionArrayOperation right)
{
return new ChangePositionArrayOperation(ListDiff.Merge(left.Diff, right.Diff));
}