Get specific XML Subvalues with Commons Configuration

Question

Lets say we have the following XML:

<root>
    <sub>
        <id>1</id>
        <values>
            <value>1</value>
            <value>2</value>
        </values>
    </sub>
    <sub>
        <id>2</id>
        <values>
            <value>16</value>
            <value>15</value> 
        </values>
    </sub>
</root>

What I want to with Apache Commons Configuration: I want to get all values for sub with id2. How could I achieve that? I find nothing in the documentation, how I can query with a dynamic hierarchy number.

score 4 · Accepted Answer · answered Nov 30 '11 at 19:49

4

You can use XPath:

//sub[id = 2]/values/value

answered Nov 30 '11 at 19:49

Kirill Polishchuk

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Awesome, that was quick. Works perfectly. Seems like the documentation could be improved at this topic :) – Dominik Obermaier Nov 30 '11 at 19:59

score 1 · Answer 2 · answered Dec 01 '11 at 05:08

1

// often leads to slow execution (causes the whole XML (sub) tree to be searched).

Use:

/*/sub[id = 2]/values/value

This selects any value element that is a child of a values element that is a child of a sub element whose id child has string value "2", and that (the sub) is a child of the top element of the XML document.

answered Dec 01 '11 at 05:08

Dimitre Novatchev

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Thanks, that could be very useful when dealing with large xml configs – Dominik Obermaier Dec 01 '11 at 07:18

Get specific XML Subvalues with Commons Configuration

2 Answers2