JavaWorld
addict
Reged: 06/20/03
Posts: 482
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Java object queries using JXPath
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tim_b123
stranger
Reged: 03/21/07
Posts: 1
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Using JXPath to query complex data structures fairly simple at compile time.
However, are there any performance comparisons between programatically interogating a data structure with the usual getters/setters and using JXPath though?
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YannR
Unregistered
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Nice idea. An alternative would be to use the JSTL notation !
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Unregistered
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There does appear to be a reasonable user guide on the Commons JXPath web site here
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Hermanussen
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Nice article. Of course, other efforts to achieve similar object query functionality have been made.
XPath is definately a good fit here. But personally, just because of the ease of use, I would prefer JoSQL.
Because SQL is so easy 
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Bart_van_Riel
stranger
Reged: 03/24/07
Posts: 3
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Hi,
I haven't found any noticable performance impact of using JXPath. The major performance hit in traversing object trees is usually in not iterating over them efficiently. JXPath optimizes this.
Grtz,
Bart.
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Bart_van_Riel
stranger
Reged: 03/24/07
Posts: 3
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You can actually combine JXPath and JEXL (which implements JSTL expression language). Use JXPath for getting objects and JEXL for retrieving values from them.
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Unregistered
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I just looked at JoSQL and it looks like a really neat tool. I'm comfortable with sql and this tool seems to fit nicely. Thanks for the posting.
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Unregistered
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JXPath is focusing on Runtime value of Java object, while JoSQL is for design time mostly, I think.
For performance, I have done a profiling on JXPath, it is very satisfied.
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Unregistered
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JXPath is focusing on Runtime value of Java object, while JoSQL is for design time mostly, I think. Also, JXPath supports XPath, while JoSQL supports SQL...
For performance, I have done a profiling on JXPath, it is very satisfied.
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Bart_van_Riel
stranger
Reged: 03/24/07
Posts: 3
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Hi all,
Message from The Writer:
Please be invited to check out the full JXPath tutorial on my website!
Get it at: JXPath Tutorial Homepage
And click my ads to pay the bills!
Thanx,
Bart.
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lenisha
Unregistered
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Well,
the performance hit is pretty considerable.
For the expression like this iterating couple of lists : "executionItems[@role='S']/priceQuantityAssociations/quantity/value"
Time is 100 times more
For the plain java object 1000 iterations: 1.6 ms
For the JXPath compiled expression 1000 iterations: 200 ms
Is there any additional performace optimization available?
Thanks
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