elygre wrote:
>
> It seems to me that it is a fairly hard requirement that the model and the
> choice list have identical types. I'll investigate a bit further, to see
> if I can build a generic mechanism for both a Map and a "bean"-style
> object.
>
After looking deeper into this, I created two different specialized
DropDownChoices, with different properties. The class signatures
(interfaces) are as follows with complete code further below
Now, of all the things I did in Wicket, this is the one thing that turned
out to be furthest from expectations. It wasn't the hardest, but it was the
easiest thing that turned out to be hard :-). If there is interest (or at
least no objections...), I'll create a jira issue and submit this code for
inclusion into 1.5.
Class signatures:
public class MapDropDownChoice<T> extends DropDownChoice<T> {
public MapDropDownChoice(String id, Map<T, ?> choices);
public MapDropDownChoice(String id, IModel<T> model, Map<T, ?> choices);
}
public class BeanDropDownChoice<T> extends MapDropDownChoice<T> {
public BeanDropDownChoice(String id, List choices, IChoiceRenderer
renderer);
public BeanDropDownChoice(String id, IModel<T> model, List choices,
IChoiceRenderer renderer);
}
Full code:
public class MapDropDownChoice<T> extends DropDownChoice<T> {
public MapDropDownChoice(String id, Map<T, ?> choices) {
super(id, new ArrayList<T>(choices.keySet()), new
MapChoiceRenderer(choices));
}
public MapDropDownChoice(String id, IModel<T> model, Map<T, ?> choices)
{
super(id, model, new ArrayList<T>(choices.keySet()), new
MapChoiceRenderer(choices));
}
private static class MapChoiceRenderer extends ChoiceRenderer {
private final Map map;
public MapChoiceRenderer(Map map) {
super("value", "key");
this.map = map;
}
public Object getDisplayValue(Object object) {
Object value = map.get(object);
return value == null ? "" : value.toString();
}
public String getIdValue(Object object, int index) {
return object == null ? "" : object.toString();
}
}
}
public class BeanDropDownChoice<T> extends MapDropDownChoice<T> {
public BeanDropDownChoice(String id, List choices, IChoiceRenderer
renderer) {
super(id, createMap(choices, renderer));
}
public BeanDropDownChoice(String id, IModel<T> model, List choices,
IChoiceRenderer renderer) {
super(id, model, createMap(choices, renderer));
}
static Map createMap(Collection choices, IChoiceRenderer renderer) {
Map map = new HashMap();
for (Object choice : choices) {
map.put(renderer.getIdValue(choice, -1),
renderer.getDisplayValue(choice));
}
return map;
}
}
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