xstream-在自定义转换器中重用默认转换器

Field    type1      type2
a        short      String
b        String     Object
c        List       List
d        Object     Object
.
.
.
x        String     String

package a.b.c.reports;

import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;

public class MyConverter implements Converter {

..

@Override
public Object unmarshal(HierarchicalStreamReader reader,UnmarshallingContext context) {

    while (reader.hasMoreChildren()) {
        reader.moveDown();
        if(reader.getNodeName().equals(\"a\"))
        {
            a = reader.getValue();
        }
        else if (reader.getNodeName().equals(\"b\")) 
        {
            b = (Object) context.convertAnother(reader, Object.class);
        } 
        else if(reader.getNodeName().equals(\"c\"))
        {
            a = reader.getValue();
        }
        ..
        ..
    }
}