> Imagine, you use the DummyCalendar in Calendar2DateFieldConversion.
>
> javaToSql will be ok.
> (... if (source instanceof Calendar) ...)
>
> but sqlToJava will materialize not the DummyCalendar (that you need),
> but a GregorianCalendar.
> (... GregorianCalendar cal = new GregorianCalendar()...)
>
> public class TestThingy2 extends TestCase
> {
> public void testCalendarConv()
> {
> DummyCalendar dc0 = new DummyCalendar();
> Date d = Calendar2DateFieldConversion.javaToSql(dc);
> Calendar dc1 = Calendar2DateFieldConversion.javaToSql(d);
>
> assertEquals(dc1, dc0); //will fail
>
> DummyCalendar dc2 = (DummyCalendar)dc1; //will fail
> }
> }
>
Absolutely - but then you must create your own conversion strategy !
Instanceof has nothing to do with this.
The Fieldconversion implementation must know what calendar implementation to
instantiate (although Calendar2DateFieldConversion should, probably, do
Calendar.getInstance and not instantiate GregorianCalendar directly) - and
it can't derive this information for the java.sql.Date
If you want to convert java.sql.Date <--> DummyCalendar then you have to
create a DummyCalendar2DateFileConversion class...
Cheers,
Charles.
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