Apache XML Configuration get node by attribute

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  • dlite922
    Recognized Expert Top Contributor
    • Dec 2007
    • 1586
    #1

    Apache XML Configuration get node by attribute

    Hey guys,

    Couldn't find what I'm looking for, so trying to see if anybody has worked with Apache Commons XML Configuration.

    I can read attributes and nodes by name just fine, what I was looking for was a look-up function by ID.

    SO

    Code:
    <nodes>
  <node id="123" foo="bar1">test1</node>
  <node id="456" foo="bar2">test2</node>
</nodes>
    If you have a String str = "456", how do you make XMLConfiguratio n class give you the second node in this example without getting all the id's and looping through it (which is what I'm currently doing).

    Desired Code:
    Code:
    String str = "456"; 
XMLConfiguration config = new XMLConfiguration("config.xml"); 
config.setExpressEngine(new XPathExpressionEngine()); 

HierarchicalConfiguration node = (HierarchicalConfiguration) config.getNodeByID(str);

String foo = node.getString("[@foo]"); 

System.out.println(foo); 

/**
Ouputs: 
bar2
*/
    Thanks!


    Dan
    Tags: None
    • dlite922
      Recognized Expert Top Contributor
      • Dec 2007
      • 1586
      #2
      The Answer: You already are using XPATH, just call an equals expression:

      Code:
      # String str = "456"; 
# XMLConfiguration config = new XMLConfiguration("config.xml"); 
# config.setExpressEngine(new XPathExpressionEngine()); 
#  
# HierarchicalConfiguration node = (HierarchicalConfiguration) config.configurationAt("/nodes/node[@id='"+(str)+"']"); // <-- CASE SENSITIVE I THINK
#  
# String foo = node.getString("@foo"); // <-- Remove brackets []
#  
# System.out.println(foo); // VOILA!!
      Hope that helps anyone else with the same issue,


      Dan

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