/**
* Gets the date pattern to use for putting selected values in the coupled component. If you
* override this method to support components that would otherwise not be supported, you should
* override {@link #checkComponentProvidesDateFormat(Component)} and let it return normally.
*
* @return The date pattern
*/
protected String getDatePattern() {
if (component instanceof ITextFormatProvider) {
return ((ITextFormatProvider) component).getTextFormat();
} else {
// cast from hell, but we checked before whether we could
IConverter converter = component.getConverter(DateTime.class);
if (converter == null) {
converter = component.getConverter(Date.class);
}
return ((SimpleDateFormat) ((DateConverter) converter).getDateFormat(component.getLocale()))
.toPattern();
}
}
/**
* Check that this behavior can get a date format out of the component it is coupled to. if you
* override this method to allow for other types (such as your own), you should override {@link
* #getDatePattern()} as well. This method should return normally if the component is accepted or
* throw a RTE when it is not.
*
* @param component the component this behavior is being coupled to
* @throws WicketRuntimeException if the component is not support.
*/
protected void checkComponentProvidesDateFormat(Component component) {
if (component instanceof ITextFormatProvider) {
// were ok
return;
}
IConverter converter = component.getConverter(DateTime.class);
if (converter == null) {
converter = component.getConverter(Date.class);
}
if (converter instanceof DateConverter) {
return; // This is ok
}
throw new WicketRuntimeException(
"this behavior can only be added to components that either implement "
+ ITextFormatProvider.class.getName()
+ " or that use "
+ DateConverter.class.getName()
+ " configured with an instance of "
+ SimpleDateFormat.class.getName()
+ " (like Wicket's default configuration has)");
}
