How to map collections in Dozer

Question

I\'d like to do something like:

ArrayList objects = new ArrayList();
...
DozerBeanMapper MAPPER = new DozerBeanMapper         


        

Answer 1

I have done it using Java 8 and dozer 5.5. You don't need any XML files for mapping. You can do it in Java.

You don't need any additional mapping for lists, only thing you need is

you need to add the list as a field in the mapping

. See the sample bean config below.

Spring configuration class

@Configuration
public class Config {

@Bean
    public DozerBeanMapper dozerBeanMapper() throws Exception {
        DozerBeanMapper mapper = new DozerBeanMapper();
        mapper.addMapping( new BeanMappingBuilder() {
            @Override
            protected void configure() {
                mapping(Answer.class, AnswerDTO.class);
                mapping(QuestionAndAnswer.class, QuestionAndAnswerDTO.class).fields("answers", "answers");                  
            }
        });
        return mapper;
    }

}

//Answer class and AnswerDTO classes have same attributes

public class AnswerDTO {

    public AnswerDTO() {
        super();
    }

    protected int id;
    protected String value;

    //setters and getters
}

//QuestionAndAnswerDTO class has a list of Answers

public class QuestionAndAnswerDTO {

    protected String question;
    protected List answers;

   //setters and getters
}

//LET the QuestionAndAnswer class has similar fields as QuestionAndAnswerDTO

//Then to use the mapper in your code, autowire it

@Autowired
private DozerBeanMapper dozerBeanMapper;
// in your method


 QuestionAndAnswerDTO questionAndAnswerDTO =
    dozerBeanMapper.map(questionAndAnswer, QuestionAndAnswerDTO.class);

Hope this will help someone follow the Java approach instead of XML.