custom converter in XStream

Question

Hi All,

I am using XStream to serialize my Objects to XML format. The formatted xml that I get is as below: node1, node2, node 3 are attributes of pojo,DetailDollars DetailDollars
node1 100 /node1 node2
25 /node2 node3 10
/node3 /DetailDollars

I have requirement where in I have to calucluate a percentage, for example 100/ 25 and add the new node to the existing ones. So, the final output should be : DetailDollars node1 100 /node1 node2 25 /node2 node3 10 /node3
node4 4 /node4
DetailDollars

I wrote a custom converter and registered to my xstream object. public void marshal(..){ writer.startNode("node4");
writer.setValue(getNode1()/ getnode2() ); writer.endNode(); }

But, the xml stream I get has only the new node: DetailDollars
node4
4
/node4 /DetailDollars

I am not sure which xstream api would get me the desired format. could you please help me with this .

Thanks, Raja chandra Rangineni.

Answer 1

Here is the converter you need:

public class DetailDollarsConverter extends ReflectionConverter {

public DetailDollarsConverter(Mapper mapper,
        ReflectionProvider reflectionProvider) {
    super(mapper, reflectionProvider);
}

@Override
public void marshal(Object obj, HierarchicalStreamWriter writer,
        MarshallingContext context) {
    super.marshal(obj,writer,context);

    DetailDollars dl = (DetailDollars) obj;

    writer.startNode("node4");
    writer.setValue(Double.toString(dl.getNode1() / dl.getNode2()));
    writer.endNode();
}

@Override
public Object unmarshal(HierarchicalStreamReader reader,
        UnmarshallingContext context) {
    return super.unmarshal(reader,context);
}

@SuppressWarnings("unchecked")
@Override
public boolean canConvert(Class clazz) {
    return clazz.equals(DetailDollars.class);
}

}