Mapping from Map within a Map

[Alan Balinju Cassar]

I have an input which consists of a Map. One of the fields within this map, is another Map.

I am trying to map a field from the inner map, to my destination object like the following:

<mapping map-null="false">

        <class-a>java.util.Map</class-a>

        <class-b>DesClass</class-b>

        <field>

         <a>ai.aiInner</a>

         <b>aiResult</b>

        </field>

</mapping>

This never sets my aiResult field, because from what I can see from my debugging, Dozer will try to do the following: input.get("ai.aiInner"), treating ai.aiInner as the name of a field.

I tried also setting <a-hint>java.util.Map</a-hint> and <a-deep-index-hint>java.util.Map</a-deep-index-hint>, but still same result.

I also tried the following:

<mapping map-null="false">

        <class-a>java.util.Map</class-a>

        <class-b>DesClass</class-b>

        <field>

        <a key="aiInner">ai</a>

        <b>aiResult</b>

        </field>

</mapping>

However this is throwing an error saying that it cannot find a getter for "ai" in call java.util.LinkedHashMap.

Any ideas?

[Tausif Farooqi]

I have the same problem. Did you find any easy solution for this?

I couldn't find a direct way to do this, so I did it by adding a custom converter that would extract the inner map first and then apply the mapping.

The mapping will look something like this:

<mapping map-null="false">

        <class-a>java.util.Map</class-a>

        <class-b>WrapperClass</class-b>

        <field custom-converter="mypackage.ConverterClass">

         <a>ai</a>

         <b>aiResult</b>

        </field>

</mapping>

<mapping map-null="false"  map-id="innerMapMapper">

        <class-a>java.util.Map</class-a>

        <class-b>DesClass</class-b>

        <field>

         <a>innerMapKey1</a>

         <b>aiResultField1</b>

        </field>

        <field>

         <a>innerMapKey2</a>

         <b>aiResultField2</b>

        </field>

</mapping>

And the class will look like this:

public class ConverterClass extends DozerConverter<Map, DesClass> implements MapperAware {

private Mapper mapper;

public ConverterClass() {

super(Map.class, DesClass.class);

}

@Override

public DesClass convertTo(Map source, DesClass destination) {

if (source != null) {

Map innerMap = source.get("aiInner");

return mapper.map(innerMap , DesClass.class, "innerMapMapper");

}

return null;

}

@Override

public Map convertFrom(DesClass source, Map destination) {

// add reverse conversion code

}

@Override

public void setMapper(Mapper mapper) {

this.mapper = mapper;

}

}