Get composite component inputs' converted values - jsf

Question

I have a composite component made of two p:calendars:
<cc:interface componentType="testComponent">
<cc:attribute name="value" type="org.primefaces.test.DateRange" />
</cc:interface>
<cc:implementation>
<c:set value="dd-MM-yyyy" var="pattern" />
<p:panelGrid columns="2">
<p:outputLabel for="from" value="From" />
<p:calendar id="from" binding="#{cc.from}" pattern="#{pattern}" />
<p:outputLabel for="to" value="To" />
<p:calendar id="to" binding="#{cc.to}" pattern="#{pattern}" />
</p:panelGrid>
</cc:implementation>
Class DateRange:
public class DateRange {
private Date from;
private Date to;
public DateRange() {
}
public DateRange(Date from, Date to) {
this.from = from;
this.to = to;
}
public Date getFrom() {
return from;
}
public void setFrom(Date from) {
this.from = from;
}
public Date getTo() {
return to;
}
public void setTo(Date to) {
this.to = to;
}
#Override
public String toString() {
return from + " --> " + to;
}
}
Backing class:
#FacesComponent("testComponent")
public class TestComponent extends UIInput implements NamingContainer {
private UIInput from;
private UIInput to;
private static final String DELIMITER = "-->";
#Override
public String getFamily() {
return UINamingContainer.COMPONENT_FAMILY;
}
#Override
public void encodeBegin(FacesContext context) throws IOException {
DateRange range = (DateRange) getValue();
System.out.println(range);
if (range != null) {
from.setValue(range.getFrom());
to.setValue(range.getTo());
}
super.encodeBegin(context);
}
#Override
public Object getSubmittedValue() {
if (from == null || to == null) return null;
String submittedFrom = (String) from.getSubmittedValue();
String submittedTo = (String) to.getSubmittedValue();
if (submittedFrom == null) {
submittedFrom = "";
}
if (submittedTo == null) {
submittedTo = "";
}
return submittedFrom + DELIMITER + submittedTo;
}
#Override
protected Object getConvertedValue(FacesContext context, Object newSubmittedValue) throws ConverterException {
String submitted = (String) newSubmittedValue;
if (submitted == null || submitted.isEmpty()) {
return null;
}
String[] split = submitted.split(DELIMITER);
String fromStr = split.length > 0 ? split[0] : "";
String toStr = split.length > 1 ? split[1] : "";
// TODO: Do I need to perform a manual conversion of the inputs???
return new DateRange((Date) fromObj, (Date) toObj);
}
getConvertedValue() should return an instance of DateRange. To get dates from calendars, I would need to call getConvertedValue() on each but this method is protected and I cannot access it.
Do I need to manually get the pattern from the p:calendar and convert the value myself? If yes, how do I even know how the conversion is really done in Calendaritself? I wonder how is this approached in more complex components where conversion on subcomponents is not that trivial.