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XPath or Java for filtering - what is faster?

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  • 10-03-2016 4:52pm
    #1
    IamtheWalrus
    Closed Accounts Posts: 6,075 ✭✭✭


    I have an XML file that I am parsing using XPath. In the document, there is a list of elements. My existing code parses the xml into Java objects and processes them.

    My new requirement is to not take all elements in the list - if the ID of the element is A or B, ignore it, but I want to keep C, D and E.

    My question is, what is fastest:
    1. Parse and save the entire list into Java objects, then filter out A and B
    2. Use XPath to exclude A and B.


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    #2
    L.Jenkins
    Moderators, Computer Games Moderators, Technology & Internet Moderators Posts: 19,240 Mod ✭✭✭✭L.Jenkins


    Would it not be easier to keep your code as is and manipulate the XPath file as needed, should the XML file change?


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    #3
    IamtheWalrus
    Closed Accounts Posts: 6,075 ✭✭✭IamtheWalrus


    Itzy wrote: »
    Would it not be easier to keep your code as is and manipulate the XPath file as needed, should the XML file change?

    So filter out using Xpath? Like such?


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    #4
    L.Jenkins
    Moderators, Computer Games Moderators, Technology & Internet Moderators Posts: 19,240 Mod ✭✭✭✭L.Jenkins


    I'm no expert, but I'm wondering is it easier that way.


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    #5
    CreepingDeath
    Closed Accounts Posts: 8,015 ✭✭✭CreepingDeath


    IamtheWalrus wrote: »
    My question is, what is fastest:
    1. Parse and save the entire list into Java objects, then filter out A and B
    2. Use XPath to exclude A and B.

    There's also an option 3, to use XSLT stylesheets to transform the original XML into one specific for your code, performing any business filtering of elements in the stylesheet. Especially if you are not in control of the structure of the XML, eg. it's from a client/third party.


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    #6
    IamtheWalrus
    Closed Accounts Posts: 6,075 ✭✭✭IamtheWalrus


    CreepingDeath wrote: »
    There's also an option 3, to use XSLT stylesheets to transform the original XML into one specific for your code, performing any business filtering of elements in the stylesheet. Especially if you are not in control of the structure of the XML, eg. it's from a client/third party.

    I can't use anything other than XPath and Java. The existing code uses those to parse the existing XML. My job is to filter out one part of it. I will not be re-writing the existing code.


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    #7
    L.Jenkins
    Moderators, Computer Games Moderators, Technology & Internet Moderators Posts: 19,240 Mod ✭✭✭✭L.Jenkins


    IamtheWalrus wrote: »
    I can't use anything other than XPath and Java. The existing code uses those to parse the existing XML. My job is to filter out one part of it. I will not be re-writing the existing code.

    Well it seems that your only option is to modify the XML document to ensure nothing in the original source code doesn't break.


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