For completeness, we actually have a few more JSON libraries in
GeoTools/GeoServer in addition to what you listed:
* Google GSON for MongoDB and ArcGIS REST (in GeoTools) and for
WMS TopoJSON format and the GeoGig community module (in
GeoServer), which is active.
* Jettison 1.0.1 (via XStream) for the JSON portion of the REST
API (Only in GeoServer). While the project is active, we're
stuck on a 10-year old version for backwards compatibility
reasons.
GSON is primarily intended for transforming Java to and from JSON
, but it does have minimal JsonPath
<https://google.github.io/gson/apidocs/com/google/gson/stream/JsonReader.html#getPath-->
support (With more robust integration added by the Jayway
implementation that you already mentioned). There's also a
seemingly abandoned fork
<https://github.com/johnnylambada/gson/commit/344bd2fd4911146e761926d5ee1b441ba6bb9cfa>
that adds Json-Pointer support.
Overall, it seems like GSON doesn't quite have the capabilities
you are looking for, but it is already a dependency of some
GeoTools modules so maybe consider it?
More generally, I'd definitely say go for a JSON library we
already depend upon (given that we have too many already), be it
Jackson or something else.
I think it's reasonable to add Jackson to gt-main. Having a JSON
library as part of a core module might encourage others to use it
rather than adding their own (although I rather doubt it).
Torben
On Wed, Jan 23, 2019 at 8:24 AM Ian Turton <ijtur...@gmail.com
<mailto:ijtur...@gmail.com>> wrote:
I'd say go for Jackson as a main dependency and then someone
(or me) could try to bring the other JSON modules uptodate by
using it, I might even merge the two at the same time, but
not until the weekend :-)
Ian
On Wed, 23 Jan 2019 at 15:45, Andrea Aime
<andrea.a...@geo-solutions.it
<mailto:andrea.a...@geo-solutions.it>> wrote:
Hi all,
as you probably know GeoTools is now sometimes carrying
around JSON in feature attributes
(e.g., see JSON support in PostGIS data store).
The JSON is represented as a String.
Now, I'd like to add a filter function to parse and
extract specific properties out of the JSON string... which
requires new dependencies. And boy we have a mess of them
in the classpath already:
* json-simple, used in geojson and mbstyles, but dead,
last release is 2012
* json-lib, used in GeoServer for geojson generation,
and also dead, last release is 2010
* jackson, used by Spring and directly by some
GeoServer community modules, with recent releases and
latest commits of only a few days ago
There are basically two languages to extract stuff from
JSON, json-path and json-pointer.
json-path is the one I would have preferred as it's more
powerful, but its situation library wise is not
exactly in great shape, the jayway implementation uses
yet another json java library, json-smart2, also dead.
There are a couple of other options for json-path, either
dead or with a bizzarre "do not evil" licence.
json-pointer is instead supported directly by
jackson-core, which is well alive, and comes with a 300kb jar
that has no external dependencies. This seems the best
bet, just one hesitation... should I add a jackson-core
to gt-main? On one side, it seems a large-ish dependency
for just a function, on the other side having a single
class new module also seems a bit overkill.
Opinions?
Cheers
Andrea
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