Map one object structure to an different XML structure

Question

I have an object similar to the following:

public class FooObj
{
    private Long id;
    private List<BarObj> subBar;
    private String someStr;

    public Long getId()
    {
        return id;
    }

    public List<BarObj> getSubBar()
    {
        return subBar;
    }

    public String getSomeStr()
    {
        return someStr;
    }

    public void setId(Long id)
    {
        this.id = id;
    }

    public void setSubBar(List<BarObj> subBar)
    {
        this.subBar = subBar;
    }

    public void setSomeStr(String someStr)
    {
        this.someStr = someStr;
    }

    public static class BarObj
    {
        private String groupId;
        private Long id;

        public String getGroupId()
        {
            return groupId;
        }

        public Long getId()
        {
            return id;
        }

        public void setGroupId(String groupId)
        {
            this.groupId = groupId;
        }

        public void setId(Long id)
        {
            this.id = id;
        }
    }
}

And I want to map the Object to an XML structure like the XML in the link: http://pastebin.com/cw018jqc EDIT: (Please look at the ObjBars element for an exact definition of what I'm looking for.)

Is there any library available that would allow me to do this?

Answer 1

So you're basically trying to split a list into multiple sublists before you serialize it to XML? I think that JAXB could really help you here. I think you could use an @XmlTypeAdapter to convert between List<BarObj> and List<List<BarObj>> , which would be one way of representing this data the way you want it marshalled to XML. Check out http://blog.bdoughan.com/2010/07/xmladapter-jaxbs-secret-weapon.html for details.