Mapping deep properties with intermediate collections in dozer

Question

Suppose I have the following classes

public class Baz {
  private List<Foo> foos = new ArrayList<Foo>();
}

public class Foo {
  private String string;
}

public class Target {
  private List<String> fooStrings = new ArrayList<String>();
}

Is there any mapping I can use to, given a Baz, map it to the target class and get a list of the strings contained within the foo's in Baz? The following mapping does not work

<mapping>
  <class-a>Baz</class-a>
  <class-b>Target</class-b>
  <field>
    <a>foos.string</a>
    <b>fooStrings</b>
  </field>
</mapping>

Because string is not a property of foos (which is of type List). I would have thought Dozer would be clever enough to, if it encountered a collection in a deep mapping, and the target was also a collection, to be able to break the deep property name into two and iterate across the collection to get the child part of the deep mapping from the collection members. Apparently not. Is there a solution short of making a feature request of Dozer?

Answer 1

You could always write your own CustomConverter.

It makes sense why Dozer isn't able to handle this as you expect since at runtime it has no type information about the List foos and can't guarantee that every Object in the list is actually a Foo.

Answer 2

I think, you can write such a mapping

<mapping>
  <class-a>Baz</class-a>
  <class-b>Target</class-b>
  <field>
    <a>foos</a>
    <b>fooStrings</b>
  </field>
</mapping>

<custom-converters> 
  <converter type="CustomFooConverter">
    <class-a>
      Foo
    </class-a>
    <class-b>
      String
    </class-b>
  </converter>
</custom-converters>

And implement CustomFooConverter to get string field of foo and return it as a String.

I think you can post a feature request to support mapping to primitives as

<mapping>
  <class-a>Foo</class-a>
  <class-b>String</class-b>
  <field>
    <a>string</a>
  </field>
</mapping>

into Dozer GitHub