This is the closest to your setup that I know how to handle with
JAXB annotations. Notice that the adapter is now set up between
Fields (new) and Config. Wrapper is just there so that the adapted
element isn't the root element.
-W
@XmlRootElement(name = "wrapper")
public class Wrapper {
public Config config;
}
//=============================================
@XmlJavaTypeAdapter(FieldListAdapter.class)
public class Config {
public Map<String,Field> field = new HashMap<String,Field>();
}
//=============================================
public class FieldListAdapter extends XmlAdapter<Fields,Config> {
@Override
public Config unmarshal( Fields value ) {
Config c = new Config();
for( Field f : value.carray ) c.field.put( f.getId(), f );
return c;
}
@Override
public Fields marshal( Config bound ){
Fields fields = new Fields();
Collection<Field> c = bound.field.values();
fields.carray = c.toArray(new Field[c.size()]);
return fields;
}
}
//=============================================
public class Fields {
@XmlElement(name="field")
public Field[] carray;
}
//=============================================
<wrapper>
<config>
<field id="1"></field>
<field id="2"></field>
<field id="3"></field>
<field id="4"></field>
</config>
</wrapper>
On Thu, Jan 8, 2009 at 11:02 PM, Smith, Matthew (BRS) <
Matthew.Smith_at_blackrock.com> wrote:
> Ok, I'm stumped.
>
> I want my sequence to be umarshaled as a Map so I'm trying to create an
> XMLAdaptor so that I can unmarshal a sequence of tags into a Map.
>
> E.g. unmarshal some XML:
>
> ----------------------------------
> <config>
> <field id="1">...</field>
> <field id="2">...</field>
> <field id="3">...</field>
> <field id="4">...</field>
> </config>
> ----------------------------------
>
> into a class Config:
>
> ----------------------------------
> @XmlRootElement(name = "config")
> public class Config {
> @XmlJavaTypeAdapter(FieldListAdapter.class)
> @XmlElement(name = "field")
> protected Map<String,Field> fields;
>
> /* accessors omitted for brevity */
> }
> ----------------------------------
>
> With this adapter:
>
> ----------------------------------
> public class FieldListAdapter extends XmlAdapter<Field[], Map<String,
> Field>> {
> public Map<String, Field> unmarshal(Field[] value) {
> Map<String, Field> r = new HashMap<String, Field>();
> for (Field c : value)
> r.put(c.getId(), c);
> return r;
> }
>
> public Field[] marshal(Map<String, Field> value) {
> return value.values().toArray(new Field[value.size()]);
> }
> }
> ----------------------------------
>
> So my adapter unmarshal method gets called but 'value' is empty. Why?
> If I change my Config class to use a List instead of a Map and take away
> the adapter the data gets unmarshaled so I know it's not my XML.
> I even tried creating an adapter to convert Field[] to List<Field> but
> value is still empty.
> Cleary JAXB can do it on it's own, so why can't I? Am I just doing
> something wrong or is what I want impossible?
>
> Thanks for your help.
>
> -Matthew
>
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