Re: SAX2: Should SAXException extend IOException?
David Megginson wrote: > > Rajiv Mordani <Rajiv.Mordani@e...> writes: > > > java.util.zip.ZipException deriving from IOException is > > appropriate. It is related to i/o so it makes sense to have that. Also, the only place it's documented to be thrown is in a constructor which also throws IOException. I expect the documentation is missing a fair number of uses though -- which often happens when an exception inherits from another one. > I'd be interested in a clear statement of the criteria for this > distinction I doubt you'll get such a clear statement. Organizational politics have come in, as well as sloppiness on the part of some developers. That's not just at Sun; many organizations get that way for any particular category of design decision you can identify. I'll just say that questions get asked if an exception has strange inheritance, which can permit it to masquerade as something it isn't, and defining new categories of RuntimeException is really perceived as undesirable. Increasingly, those questions need good answers if such exceptions are expected to become parts of public APIs. > -- you get a ZipException, presumably, because of an error > in the format of the zip file you're reading from; Curious example. java.util.zip.DataFormatException is what I'd expect to get when faced with bad ZIP data. (Recalling some of the chaos involved in seeing JDK 1.1 get ZIP/JAR support, it's no surprise that its exception architecture seems pretty odd.) That's not an IOException. > you get a > SAXException because of an error in the format of the XML file you're > reading from. Looking at the JDK 1.2 javadocs, I also see these data format style exceptions, which don't derive from IOException: java.security.certificate.CertificateEncodingException java.security.certificate.CertificateParsingException java.text.ParseException java.lang.NumberFormatException java.awt.image.RasterFormatException org.omg.CORBA. ... several ... As with XML format errors, higher layers won't usually see those; they get morphed by intermediate layers into diagnostics that are more task-relevant. (A few of those are RuntimeExceptions though.) - Dave xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To unsubscribe, mailto:majordomo@i... the following message; unsubscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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