On Sun, Apr 15, 2018 at 9:53 AM, Marcel Overdijk <mar...@overdijk.me> wrote:
> Hi,
> Is it possible to provide (request-based) context to a custom
> `JsonSerializer`? Like a `fieldsets` request param to remove some fields
> from the generated json?
> Or is the best option to bind the needed context to a `ThreadLocal`?
> Basically when calling objectMapper.writeValueAsString(document) in a custom
> serializer I want to change the json data based on a particular context
> which is not part of the provided document.

Yes, there are "context attributes" that were added to reduce/remove
need for passing things using ThreadLocals.
You  can specify baseline attributes via ObjectMapper, but usually
they are set on ObjectReader and ObjectWriter
which are light-weight reconfigurable entities constructed from
ObjectMapper (configuration of which may not be
changed on per-call basis).

So, something like:

   ObjectWriter w = mapper.writer() // or, `writerFor(type)` to cache
lookup for serializer
         .withAttribute("key", value);

   w.writeValue(new File("foo.json"), thingToSerialize);

Serialize can then call `provider.getAttribute("key")` to locate active value.

I hope this helps,

-+ Tatu +-

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