public static class MapEntryConverter implements Converter {
public boolean canConvert(Class clazz) {
return AbstractMap.class.isAssignableFrom(clazz);
}
public void marshal(Object value, HierarchicalStreamWriter writer, MarshallingContext context) {
AbstractMap map = (AbstractMap) value;
for (Object obj : map.entrySet()) {
Entry entry = (Entry) obj;
writer.startNode(entry.getKey().toString());
if (entry.getValue() instanceof HashMap) {
marshal(entry.getValue(), writer, context);
} else {
writer.setValue(entry.getValue().toString());
}
writer.endNode();
}
}
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
Map<String, Object> map = new HashMap<String, Object>();
while(reader.hasMoreChildren()) {
reader.moveDown();
map.put(reader.getNodeName(), reader.getValue());
reader.moveUp();
}
return map;
}
}
The code shown above is based on the Xstream code provided in this link from stackoverflow.com. A recursive call is added to take account of nested Hashmaps.
