On Tue, Dec 11, 2018 at 7:04 PM Denis Mouraviev
<denis.mourav...@gmail.com> wrote:
>
> Hello,
>
> i need to serialize cyclic object graph, i dont own those pojos, so
> annotations are not the way to go.
> I guess i need to write a custom serializer for that. The problem is there a
> lot of different types in that graph.
> i will end up with atleast a function for each type like:
>
> gen.writeStartObject();
> gen.writeStringField("id", value.getId());
> writeFlowers(gen, value.getFlowers());
> gen.writeEndObject();
>
>
> Is there any way to reuse BeanSerializer with ignores or maybe
> BeanPropertyWriter
> (i know which fields are bidirectional or cyclic references i can exclude em).
>
> Or may be there is known serailizer which takes for example yaml
> specification and based on that specification
> serialized objects?
No, annotations (*) are needed to make Jackson handle cyclic
references; either full identity (@JsonIdentityInfo)
or parent/child style relationship (@JsonManagedReference / @JsonBackReference)
(*) or something exposed through `AnnotationIntrospector`
But there are 2 ways to supply annotation information even without
types themselves having annotations:
1. Mix-in annotations (associate annotations from different
interface/class with target type)
2. Custom `AnnotationIntrospector` that obtains configuration from
some other source
so you may be able to implement it that way.
-+ Tatu +-
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