CODEWITHSUNDEEP
javaspringmapstruct
Petr
Petr

Reputation: 45

Java and MapStruct

How i can initialize List in field and add in this list some values?

    @Mapper(componentModel = "spring")
public interface MapStructAdapter {

  @Mapping(source = "some", target = "some")
  @Mapping(expression = "java(new java.util.ArrayList<LegalEntity>())", target = "legalEntities")
  @Mapping(expression = "java(new my.some.package.LegalEntity())", target = "getLegalEntities().add()")
  @Mapping(source = "entityShortName", target = "legalEntities.legalEntity.shortName")
  Representative convert(Message message);
}

Upvotes: 0

Views: 305

Answers (2)

Sjaak
Sjaak

Reputation: 4160

Just add a (factory)method to your mapper. No argument and return the List. Can be a default method or a method in s class you @Mapper#uses

Upvotes: 0

bobbroker
bobbroker

Reputation: 26

You should be able to add your own conversion methods in a mapper.

https://mapstruct.org/documentation/stable/reference/html/#adding-custom-methods

Example,

@Mapper(componentModel = "spring")
public interface MapStructAdapter {

    @Mapping(source = "some", target = "some")
    @Mapping(source = "entityShortName", target = "legalEntities")
    Representative convert(Message message);

    default List<LegalEntity> toLegalEntities(String entityShortName) {
        LegalEntity legalEntity = new LegalEntity();
        legalEntity.setShortName(entityShortName);
        return Collections.singletonList(legalEntity);
    }
}

Upvotes: 1

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