custom converter in XStream

converters, xstream

Solution

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);
}

}

Problem

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 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> </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 .

Original source