Getting out-of-order outputs when using map builder

[cavenaghi9]

I try to put key and values with MapBuilder, for instance

mapBuilder.put(-2, "v1");
mapBuilder.put(0, "v2");

However, key 0 will on first item, when encoding map. Is it possible to keep the same order what I inserted?

[c-rack]

Map internally uses a HashMap. If you come up with a PR that changes the current HashMap implementation to a TreeMap one, I will merge it.

[beclever]

I found that it was not the https://github.com/c-rack/cbor-java/blob/master/src/main/java/co/nstant/in/cbor/model/Map.java but the sortedMap of TreeMap
type in https://github.com/c-rack/cbor-java/blob/master/src/main/java/co/nstant/in/cbor/encoder/MapEncoder.java caused the problem. In the case, -2 encode as 33, 0 encode as 0, so key 0 will on first item. I don't know why it should bee sortedMap here?

[c-rack]

The TreeMap is used because the CBOR specification has a section about a canonical format:
https://tools.ietf.org/html/rfc7049#section-3.9

One could consider to introduce a non-canoncial mode, which does not use a TreeMap. Any PRs in that direction are welcome.

[illumi]

I'm also interested in map insertion order. How would you prefer to configure such a mode?

[c-rack]

@cavenaghi9 @beclever @illumi I have pushed an update that keeps the order of map entries if the non-canonical mode is active (see README). Publishing to maven central follows.

[vcamargo]

@c-rack when the version 0.9 of the library will be available on maven central repository?