Hi,
Villemos wrote:
>
> Sorry if this is an answer that show how little I know of XStream; I cant
> find the ListConverter in the XStream API...?
I am sorry, I mixed up some project-specific extensions with the standard
functionality. So it is not your fault, if you do not find something.
However, the approach stays the same. You'll need a local custom converters
that handles your lists. You may derive them from the CollectionConverter:
class AliasingCollectionConverter extends CollectionConverter {
private String alias;
private Class itemType;
public AliasingCollectionConverter(Mapper mapper, String alias, Class
itemType) {
super(mapper);
this.alias = alias;
this.itemType = itemType;
}
protected void writeItem(Object item, MarshallingContext context,
HierarchicalStreamWriter writer) {
if (item != null) {
ExtendedHierarchicalStreamWriterHelper.startNode(writer, alias,
item.getClass());
context.convertAnother(item);
writer.endNode();
} else {
super.writeItem(item. context, writer);
}
}
protected Object readItem(HierarchicalStreamReader reader,
UnmarshallingContext context, Object current) {
if (alias.equals(reader.getNodeName())) {
return context.convertAnother(current, itemType);
} else {
return super.readItem(reader, object, current);
}
}
}
then you register two instance locally for your lists:
xstream.registerLocalConverter(Metadata.class, "result", new
AliasingCollectionConverter(xstream.getMapper(), "item",
MetadataItem.class));
xstream.registerLocalConverter(MetadataItem.class, "fields", new
AliasingCollectionConverter(xstream.getMapper(), "item",
MetadataField.class));
The registration can be done alternatively also with annotations:
public class Metadata {
// ...
@XStreamConverter(value=AliasingCollectionConverter.class,
types={MetadataItem.class}, strings={"item"})
public List<MetadataItem> result = new ArrayList<MetadataItem>();
// ...
}
public class MetadataItem {
// ...
@XStreamConverter(value=AliasingCollectionConverter.class,
types={MetadataField.class}, strings={"item"})
public List<MetadataField> fields = new ArrayList<MetadataField>();
// ...
}
I did not cross-check this code, but you get the ides. Hope this helps,
Jörg
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