static boolean matchValue(FacesContext ctx,
    UIComponent component,
    Object value,
    Iterator<SelectItem> items,
    Converter converter) 
{
        while (items.hasNext()) {
            SelectItem item = items.next();
            if (item instanceof SelectItemGroup) {
                SelectItem subitems[] =
                      ((SelectItemGroup) item).getSelectItems();
                if ((subitems != null) && (subitems.length  > 0)) {
                    if (matchValue(ctx, component, value, new ArrayIterator(subitems), converter)) {
                        return (true);
                    }
                }
            } else {
                Object compareValue = null;
                try {
                    compareValue = doConversion(ctx, component, item, value,
                        converter);
                } catch (IllegalStateException ise) {
                    continue;
                }
                if (null == compareValue && null == value) {
                    return true;
                }
                if (value.equals(compareValue)) {
                    return (true);
                }
            }
        }
        return (false);
}

Return true if the specified value matches one of the available options, performing a recursive search if if a javax.faces.model.SelectItemGroup instance is detected.

 static boolean valueIsNoSelectionOption(FacesContext ctx,
    UIComponent component,
    Object value,
    Iterator<SelectItem> items,
    Converter converter) 
{
        boolean result = false;
        while (items.hasNext()) {
            SelectItem item = items.next();
            if (item instanceof SelectItemGroup) {
                SelectItem subitems[] =
                      ((SelectItemGroup) item).getSelectItems();
                if ((subitems != null) && (subitems.length  > 0)) {
                    if (valueIsNoSelectionOption(ctx, component, value, new ArrayIterator(subitems), converter)) {
                        result = true;
                        break;
                    }
                }
            } else {
                Object compareValue = null;
                try {
                    compareValue = doConversion(ctx, component, item, value,
                        converter);
                } catch (IllegalStateException ise) {
                    continue;
                }
                if (null == compareValue && null == value &&
                    item.isNoSelectionOption()) {
                    result = true;
                    break;
                } else if (value.equals(compareValue) && item.isNoSelectionOption()) {
                    result = true;
                    break;
                }
            }
        }
        return result;
}

Returns true iff component has a UISelectItem child whose itemValue exactly matches the argument value