[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Exceptions or not (Was: RE: ModSAX (SAX 1.1) Proposal)
David Megginson wrote: > Jarle Stabell writes: > > > I haven't used Java much, so personally I don't know whether I find > > this forced declarations of exception throwing a good thing. (It > > seems to me quite a lot of people throws in the towel and just > > writes "throws exception") > > Sure, it can get to that point, but then the exception falls off the > top level, and you still end up with some useful information about > where your bug was, so you're still better off than you would have > been. True. I love exceptions and find that they greatly improves the robustness of applications, but the reason I'm not convinced about whether it is good to be forced to specify what will be thrown is that this in many cases seem to require psychic powers of the designer (or that the "real" exceptions must be catched and converted into an "acceptable" one, which looses information). > Besides, "throws Exception" requires a conscious effort to turn off > the safety mechanisms. Not when you are desperate or in a hurry! ;-) > boolean hasNamespaces = true; > boolean hasXLink = true; > boolean hasDDML = true; > boolean hasXPointer = true; > > try { > parser.setFeature("com.foo.features.namespaces", true); > } catch (SAXNotSupportedException e) { > hasNamespaces = false; > } > > try { > parser.setFeature("com.foo.features.xlink", true); > } catch (SAXNotSupportedException e) { > hasXLink = false; > } > > try { > parser.setFeature("com.foo.features.ddml", true); > } catch (SAXNotSupportedException e) { > hasDDML = false; > } > > try { > parser.setFeature("com.foo.features.xpointer", true); > } catch (SAXNotSupportedException e) { > hasXPointer = false; > } I meant that the SetFeature should return a boolean, not necessarily introduce/use a special supportsFeature method. Then one could use something like (haven't used Java in a while, so this may contain errors!): boolean hasNamespaces = parser.setFeature("com.foo.features.namespaces", true); boolean hasXLink = parser.setFeature("com.foo.features.xlink", true); boolean hasDDML = parser.setFeature("com.foo.features.ddml", true); boolean hasXPointer = parser.setFeature("com.foo.features.xpointer", true); and then you could analyze the results, or put some analyzis in between the above calls. Cheers, Jarle Stabell 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 (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe 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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