How to get the underlying OutputStream of a PrintWriter ?

Question

There's an interface method (in javax.sql.DataSource)
setLogWriter(PrintWriter log)
which I have to implement, and which supplies me an output channel for log messages.
I want to use java.utils.logging to output to this log.
The nearest thing I got is
java.util.logging.Logger logger = Logger.getAnonymousLogger(); // or any other method
java.util.logging.StreamHandler streamHandler = new StreamHandler();
streamHandler.setOutputStream ( os ); // supply an existing java.io.OutputStream
logger.addHandler(streamHandler);My problem:
- how can I get the underlying OutputStream from a given PrintWriter object ?
- is there an easier way than to subclass my own PrintWriterHandler from StreamHandler ?
- if the previous answer is "no, there no easier way, and that's the way to go", any recommendations on how to ?
- any other idea ?
Thanks

Answer 1

Data Fiddler wrote:
There's an interface method (in javax.sql.DataSource)
setLogWriter(PrintWriter log)
which I have to implement, and which supplies me an output channel for log messages.You're creating your own DataSource?
- how can I get the underlying OutputStream from a given PrintWriter object ?You can't. As far as I know the PrintWriter class doesn't provide a method for that.
- is there an easier way than to subclass my own PrintWriterHandler from StreamHandler ?The Javadoc for StreamHandler says "This is primarily intended as a base class or support class to be used in implementing other logging Handlers.". So I guess creating your own PrintWriterHandler
would be a good way to go.
- if the previous answer is "no, there no easier way, and that's the way to go", any recommendations on how to ? Well, since you want to write to a PrintWriter and not an OutputStream, it's kind of like breaking the contract for that class (since it says "LogRecords are published to a given java.io.OutputStream").
But that shouldn't be a big problem. You'd end up making a few of the methods no-ops (like the setOutputStream and setEncoding) and add your setPrintWriter (or maybe setWriter) method to get the functionality you want.