On 05/05/2008 09:09 AM, Neal Gafter wrote:
On Mon, May 5, 2008 at 5:54 AM, David M. Lloyd <[EMAIL PROTECTED]> wrote:
On 05/03/2008 08:40 AM, Paulo Levi wrote:
Is it possible to make the java.sql interface Connection, Statement and
ResultSet descend from closeable?
Not that I'm aware of, since SQLException doesn't extend IOException. That
said, it might be nice to have a java.sql.Closeable for some future JDBC...
I guess once you have that, you could do a java.lang.Closeable with a close
method that throws Exception, and derive both java.io.Closeable and
java.sql.Closeable from that. :-)
I think you want Closeable to be something like
interface Closeable<X extends Exception> {
void close() throws X;
}
Deciding how to do this is more of a Java SE specification issue than
an OpenJDK implementation issue.
Not really - I mean, this is more complex than it needs to be. You could
just have:
void close() throws Exception;
on the base (java.lang perhaps?) interface, and override with the existing
void close() throws IOException;
in java.io. Similarly covariant interfaces could exist elsewhere too. The
problem with introducing generics on the base interface is that if you want
to inherit it from more than once place, you can't - even if the desired
exception type is a subclass of all the specified parent interfaces. Using
generics where basic covariance can work introduces more problems than it
solves.
- DML
