How cast an Object to another Object with the same attributes using design pattern? without libraries

Question

I've two POJOs in Java: Movie to use in my database and other Movie to use like result from request to webservice.

package .service
public class Movie{
 @Serialized("Title")
 private String title;
 @Serialized("Year")
 private String year;
 @Serialized("Poster")
 private String poster
}

package .database
public class Movie{
  @ColumnInfo(name = "title")
  private String title;
  @ColumnInfo(name = "year")
  private String year;
  @ColumnInfo(name = "poster")
  private String poster;
}

I've solved this by creating a class that does the conversion:

 public class MovieObjectAdapter {
    public static List<service.Movie> castFrom(List<database.Movie>moviesDatabase){
        List<service.Movie> moviesModel = new ArrayList<>();
        for (database.Movie movie:
             moviesDatabase) {
            service.Movie movieModel = new service.Movie();
            movieModel.setTitle(movie.getTitle());
            movieModel.setPoster(movie.getPoster());
            movieModel.setYear(movie.getYear());
            moviesModel.add(movieModel);
        }
        return moviesModel;
    }
}

But I'm not very happy with this. So which design pattern can you recommend for me to use?

Edit:

Oh I´m sorry i forgot a little detail, my service have another attributes names that my database, that is the reason of i´ve have two pojos. Sorry for omit this.

score 1 · Accepted Answer · answered Sep 27 '18 at 17:50

I have done this with Mapper class

public final class Mapper {

   public static service.Movie from(database.Movie dMovie) {
      service.Movie movie = new service.Movie();
      // set the properties based on database.Movie
      return movie;
   }
}

score 1 · Answer 2 · answered Sep 27 '18 at 18:20

You can use a technique called "reflection". Like in this article: https://www.javainuse.com/java/chap1 This technique is potent for tasks like mapping one object to another. But it has one drawback - such mapping may be slow (relatively, compared with direct mapping, as you do). But, I think, in your case, it's an ideal solution.

score 0 · Answer 3 · answered Sep 27 '18 at 17:49

0

Movie from service package and Movie from database package have same attributes. You should consider having a package for common objects. For example using Movie from application main package wherever needed either in service or in database is much easier and clear.

answered Sep 27 '18 at 17:49

Gratien Asimbahwe

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I´m sorry for the confusion of my question. But if you see my edit, I´ve have different annotations to my POJO´s – Daniel Carreto Sep 27 '18 at 18:01

How cast an Object to another Object with the same attributes using design pattern? without libraries

3 Answers3