Casting source object in MapStruct

[Hylton Peimer]

I'm mapping object of class "A" to a dto "ADto".

"A" contains a reference to class "B" which has subclass "C".

Is there a way to tell MapStruct the reference to "B" is an instance of "C"? The reason being that I have another mapping function that does something with "C".

I'm currently doing the following - which works, but I believe there must be a better way (eg. something with annotations)

    @Mapping(expression = "java( someC( (C) obj.gB() ) )", target = "something")
    ADto map(A a);

    D someC(C c);

[Andreas Gudian]

What I would do is quite similar to what you are doing, just without having to use the java-expression:

Create a manual method that does the instance-of check and, if applicable, delegate to someC(..). MapStruct will generate the call to that method and that's it.

We have an issue on GitHub describing a feature that might generate such downcasting methods, but it's not more than an idea currently.

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