Mapping Lists of objects with Dozer

Question

I created a dozer mapping for ClassA to ClassB.

Now I want to map a List<ClassA> to a List<ClassB>.

Is it possible to just

mapper.map(variableListClassA, variableListClassB)

or do I have to go over a loop, e.g.

for (ClassA classA : variableListClassA) {
    variableListClassB.add(mapper.map(classA, ClassB.class))
}

score 14 · Accepted Answer · answered Jan 17 '13 at 15:59

14

You need to use the loop, because the type of the list is erased at runtime.

If both lists are a field of a class, you can map the owning classes.

answered Jan 17 '13 at 15:59

artbristol

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score 13 · Answer 2 · edited Mar 18 '14 at 13:17

you could also use A helper class to do that in one step

public class DozerHelper {

    public static <T, U> ArrayList<U> map(final Mapper mapper, final List<T> source, final Class<U> destType) {

        final ArrayList<U> dest = new ArrayList<U>();

        for (T element : source) {
        if (element == null) {
            continue;
        }
        dest.add(mapper.map(element, destType));
    }

    // finally remove all null values if any
    List s1 = new ArrayList();
    s1.add(null);
    dest.removeAll(s1);

    return dest;
}
}

and your call above would be like

List<ClassB> listB = DozerHelper.map(mapper, variableListClassA, ClassB.class);

wouldn't it be more correct to add the generics to s1 list? like List s1 = new ArrayList(); — Turtletrail, Mar 29 '16 at 09:41

Mapping Lists of objects with Dozer

2 Answers2