[josm-dev] JOSM version detect

[Frederik Ramm]

Hi,

> I will modify JOSM to store a version number with each data set. When 
> you load data from a file, it has the version number given in the file. 
> When you download data from the server, JOSM will (for performance) 
> first try the configured version number but if that fails, it will make 
> a capabilities request and use the version number supported by the 
> server (if JOSM is capable of speaking that version of course).

I have now implemented most of this and just checked it in. I found the 
whole data upload/download thing to be somewhat over-engineered and 
tried to make it a bit simpler and easier to work with. It is still some 
way to go to perfect clarity but I think it was a first step in the 
direction.

All API requests are now channeled through the OsmApi class which also 
takes care of using the right version to talk to the server. Objects are 
still built with the help of OsmWriter but we're not using the rather 
complex interface and stream stuff but simply create strings containing XML.

What I have just committed seems to work all right with 0.5 and 0.6 
servers. The cancel and error situation handling still needs to be 
checked and probably improved. Also, I have to check whether it always 
behaves right when dealing with 0.5 and 0.6 files and mixing them.

Of course, anyone is welcome to look at my code and fix things. There 
are a few situations where I think I have not yet found the best design 
decision especially concerning the division of labour between 
OsmServerWriter and OsmApi. Maybe they should be merged.

http://josm.openstreetmap.de/changeset/1523

If you find any strangeness regarding server up-/download on josm-latest 
in the next few days, send me a quick e-mail and I'll investigate.

Bye
Frederik

-- 
Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"