mapping 2 objects over to collection

[Anton Dorn]

Hi,

I've got the following source:

class Source{

     ClassA propA;

    ClassB propB;

}

class Target{

   List<ClassAB> list;

}

I'm trying to create 2 elements of ClassAB in list and map propA to 1st, propB to 2nd.

i tried:

public abstract ClassAB map1(ClassA value);

public abstract ClassAB map2(ClassB value);

    void map1(ClassB prevValue, @MappingTarget List<ClassAB> list){

    ClassAB type = map2(prevValue);

    list.add(type);

    }

    void map2(ClassA value, @MappingTarget List<ClassAB> addresses){

     ClassAB type = map2(prevValue);

     list.add(type);

    }

Getting errors when generating. I believe i've see somewhere that i can map multiple sources to one target but i can't find it in reference... 

Thanks in advance for any suggestions :)

Anton

[Gunnar Morling]

Hi Anton,

You can indeed combine several sources to one target object (see http://mapstruct.org/documentation/#section-def-mapper-03), but that's a bit different from what you are trying to do.

Using a Java expression (see http://mapstruct.org/documentation/#section-expressions) may do the trick, assuming you have (generated or manually written methods for mapping ClassA/ClassB to ClassAB):

    @Mapping(target="list", expression="java( Arrays.asList( toClassAb( source.getPropA() ), toClassAb( source.getPropB() ) )")

    public Target sourceToTarget(Source source);

Out of interest, what's your actual use case for this? Combining two distinct source props into one target list is something I've not come across before :)

Hth,

--Gunnar

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[Anton Dorn]

Thanks!!! I ended up using ListUtils from apache-collections. 

Well, i'm transforming pretty flat structure into xml schema where a lot of elements are presented as lists (with type on each element saying what it is, eg. Home/Work for address). 

And in source objects, i've got separate elements for homeaddress and workaddress.