public static Converter getSelectItemConverter(
Application facesApplication, Iterator<SelectItem> selectItems) {
Converter converter = null;
while (selectItems.hasNext() && converter == null) {
SelectItem selectItem = selectItems.next();
if (selectItem instanceof SelectItemGroup) {
SelectItemGroup selectItemGroup = (SelectItemGroup) selectItem;
Iterator<SelectItem> groupSelectItems =
Iterators.forArray(selectItemGroup.getSelectItems());
// Recursively get the converter from the SelectItems of the SelectItemGroup
converter = getSelectItemConverter(facesApplication, groupSelectItems);
} else {
Class<?> selectItemClass = selectItem.getValue().getClass();
if (String.class.equals(selectItemClass)) {
return null; // No converter required for strings
}
try {
converter =
facesApplication.createConverter(
selectItemClass); // Lookup the converter registered for the class
} catch (FacesException exception) {
// Converter cannot be created
}
}
}
return converter;
}
@SuppressWarnings("unchecked")
private SelectItem[] createSelectItems(Object value) {
List<SelectItem> items = new ArrayList<SelectItem>();
if (value instanceof SelectItem[]) {
return (SelectItem[]) value;
} else if (value instanceof Collection) {
Collection<Object> col = null;
try {
col = (Collection<Object>) value;
} catch (ClassCastException cce) {
throw new FacesException(cce);
}
for (Object item : col) {
if (item instanceof SelectItemGroup) {
SelectItemGroup itemGroup = (SelectItemGroup) item;
SelectItem[] itemsFromGroup = itemGroup.getSelectItems();
for (int i = 0; i < itemsFromGroup.length; i++) {
items.add(itemsFromGroup[i]);
}
} else {
FacesContext.getCurrentInstance()
.getExternalContext()
.getRequestMap()
.put(this.getVar(), item);
SelectItem selectItem = this.createSelectItem();
FacesContext.getCurrentInstance()
.getExternalContext()
.getRequestMap()
.remove(this.getVar());
items.add(selectItem);
}
}
} else if (value instanceof Map) {
Map<String, Object> map = null;
try {
map = (Map<String, Object>) value;
} catch (ClassCastException cce) {
throw new FacesException(cce);
}
for (Map.Entry<String, Object> item : map.entrySet()) {
FacesContext.getCurrentInstance()
.getExternalContext()
.getRequestMap()
.put(this.getVar(), item.getValue());
SelectItem selectItem = this.createSelectItem();
FacesContext.getCurrentInstance()
.getExternalContext()
.getRequestMap()
.remove(this.getVar());
items.add(selectItem);
}
}
return items.toArray(new SelectItem[0]);
}
private int getSize(UIComponent component) {
int size = UIComponentUtil.getPrimitiveIntAttribute(component, JsfConstants.SIZE_ATTR);
if (0 < size) {
return size;
}
size = 0;
for (Iterator it = new SelectItemsIterator(component); it.hasNext(); ) {
SelectItem item = (SelectItem) it.next();
if (item instanceof SelectItemGroup) {
SelectItemGroup itemGroup = (SelectItemGroup) item;
size += itemGroup.getSelectItems().length;
}
size++;
}
return size;
}
// Create an options list with nested groups
protected List setupOptions() {
SelectItemGroup group, subgroup;
subgroup = new SelectItemGroup("Group C");
subgroup.setSelectItems(
new SelectItem[] {new SelectItem("C1"), new SelectItem("C2"), new SelectItem("C3")});
List options = new ArrayList();
options.add(new SelectItem("A1"));
group = new SelectItemGroup("Group B");
group.setSelectItems(
new SelectItem[] {
new SelectItem("B1"), subgroup, new SelectItem("B2"), new SelectItem("B3")
});
options.add(group);
options.add(new SelectItem("A2"));
options.add(new SelectItem("A3"));
return (options);
}
protected void resolveAndAddItems(SelectItemGroup group, List<SelectItem> items) {
for (SelectItem item : group.getSelectItems()) {
if (item instanceof SelectItemGroup) {
resolveAndAddItems((SelectItemGroup) item, items);
} else {
items.add(item);
}
}
}
protected void renderSelectItems(
FacesContext context,
UIComponent component,
ResponseWriter writer,
Iterator it,
String[] selectedValues)
throws IOException {
while (it.hasNext()) {
final SelectItem selectItem = (SelectItem) it.next();
if (selectItem instanceof SelectItemGroup) {
SelectItemGroup selectItemGroup = (SelectItemGroup) selectItem;
SelectItem[] selectItems = selectItemGroup.getSelectItems();
Iterator selectItemsIt = new ArrayIterator(selectItems);
writer.startElement(JsfConstants.OPTGROUP_ELEM, component);
RendererUtil.renderAttribute(writer, JsfConstants.LABEL_ATTR, selectItemGroup.getLabel());
// TODO case: optgroup is disabled
renderSelectItems(context, component, writer, selectItemsIt, selectedValues);
writer.endElement(JsfConstants.OPTGROUP_ELEM);
} else {
writer.startElement(JsfConstants.OPTION_ELEM, component);
final Object value = selectItem.getValue();
RendererUtil.renderAttribute(writer, JsfConstants.VALUE_ATTR, value);
final boolean disabled = UIComponentUtil.isDisabled(component) || selectItem.isDisabled();
final String labelClass = getLabelStyleClass(component, disabled);
if (labelClass != null) {
RendererUtil.renderAttribute(writer, JsfConstants.CLASS_ATTR, labelClass);
}
if (value != null && isSelected(selectedValues, value.toString())) {
renderSelectedAttribute(writer);
}
if (selectItem.isDisabled()) {
renderDisabledAttribute(writer);
}
writer.writeText(selectItem.getLabel(), null);
writer.endElement(JsfConstants.OPTION_ELEM);
}
}
}
