[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: SAX2: Should SAXException extend IOException?
David Megginson wrote: > > 1. Is SAXException logically a kind of I/O exception? > > After a lot of thought (and practical experience writing apps and > libraries that use SAX), I'm certain that the answer to this > question is 'yes'. I know that to many of us on the list, XML is > the sun, the moon, and the stars, but for the rest of the world > it's just a fancy format that you can write information to or read > it from -- in other words, XML is almost never the point, just a > means. > > From that point of view, reading information from an XML document > is a kind of I/O, so it makes sense for SAXException to be a kind > of IOException. But SAXExceptions do not just represent exceptions in reading information from an XML document. They also represent arbitrary exceptions thrown by callbacks during the course of processing an XML document. I cannot see any argument on the basis of which these can be considered I/O Exceptions. > 2. Should SAX2 callbacks throw IOException or SAXException? This seems like a false dichotomy to me. Why not keep SAXException as it is, not derived from IOException, but change the handler functions to throw both IOException and SAXException? This avoids tunnelling in the common case. Note that in Java if I have an interface that declares a method as throwing exceptions A and B, an implementation of that method can be declared as throwing both A and B, or just A or just B or nothing at all. James 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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