Using @JsonFormat throws an exception as well.
I think your idea merging the maps would work but creates unwanted API and
intermediate objects.
FYI: I ended up using @JsonSerializer(using =...) (note that as does not
work when interface already implements Map) and implemented a fully custom
rendering of the maps and properties.
/Jan
Am Dienstag, 19. März 2019 05:37:46 UTC+1 schrieb Tatu Saloranta:
>
> On Mon, Mar 18, 2019 at 7:28 PM Jan Bernitt <jaanb...@gmail.com
> <javascript:>> wrote:
> >
> > Hi,
> >
> > given this model:
> >
> > interface A<T> extends Map<String, T> {
> >
> > Map<String, Object> getExtensions();
> >
> > String getX();
> >
> > void setX(String x);
> > }
> >
> > class Foo extends A<Bar> { }
> > class Bar { }
> >
> > Filling it with data:
> >
> > Foo foo = new Foo();
> > foo.put("bar", new Bar()); // using it as Map
> > foo.setX("y");
> > foo.getExtension().put("ext", "ext-value");
> >
> > I want this JSON generated:
> >
> > {
> > "bar": {
> > // bar's properties
> > },
> > "x": "y" ,
> > "ext": "ext-value"
> > }
> >
> > So the extensions Map is flattened into the same object as the extended
> map. And properties like `x` are included as well.
> >
> > This has proven hard to configure.
> > Treating it as bean would require two usages of @JsonAnyGetter (extended
> and extension map).
> > Treating it as map ignores the other properties.
> > Using custom serializers would need to delegate to a map and a bean
> serializer as it would be used if I would not configure a custom
> serializer. I failed to do this so far.
> >
> > Any suggestion is welcome.
>
> I think you covered all available options, and I can't think of
> others. About the only note I'll make is that it is not possible to
> annotate more than one accessor with `@JsonAnyGetter`: it will not
> work and may (should) throw an exception to indicate problem.
>
> What I would probably due would be to treat is as POJO (with
> @JsonFormat(shape = Shape.POJO)), and then define custom accessor to
> annotate with `@JsonAnyGetter`: one that would combine `extensions`
> with entries of `Map` itself.
>
> -+Tatu +-
>
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