java xpath expression get only value if child node is different

Question

I woudlike to get one specific value of node if child node is different like present in my expression :

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
 DocumentBuilder builder = factory.newDocumentBuilder();
 document = builder.parse(new File("test.xml")); 

List<String> data = new ArrayList<>();
XPath xpath = XPathFactory.newInstance().newXPath();
NodeList nodes = (NodeList) xpath.evaluate("/name1/type/*[name()!= 'pmc']", document, XPathConstants.NODESET);
        for (int i = 0; i < nodes.getLength(); i++) {
            Element el = (Element) nodes.item(i);
            data.add(el.getAttribute("id"));
        }

System.out.println(data);

test.xml :

<?xml version="1.0" encoding="UTF-8"?>
<name1>
    <type id ="1">
        <coord>67</coord>
        <lmc>57657</lmc>
    </type>
    <lang>
        <eng>989</eng>
        <spa>123</spa>
    </lang>
</name1>
<name2>
    <type id ="2">
        <coord>534</coord>
        <lmc>654654</lmc>
    </type>
    <lang>
        <eng>354</eng>
        <spa>2424</spa>
    </lang>
</name2>
<name3>
    <type>
        <coord>23432</coord>
        <pmc>14324</pmc>
    </type>
    <lang>
        <eng>141</eng>
        <spa>142</spa>
    </lang>
</name3>

For example I wouldlike to get only the id if the childnode is 'pmc' and not the others.

Your xml is invalid (for example <pmc>14324</umc>). Can you edit your question and fix it? — Jack Fleeting
– Jack Fleeting, Commented Sep 20, 2020 at 20:33
What exactly is the problem? Does your code run? Are there errors? Then post the error message and the full stack trace. — vanje
– vanje, Commented Sep 20, 2020 at 21:33
Then you should mention this in your question. And please include the expected result and the actual result. In the predicate do you mean the function name()? Then you should include the parentheses. — vanje
– vanje, Commented Sep 20, 2020 at 21:51
@vanje yes sorry... yes I mean name() but it seems != not working.. — justin1298
– justin1298, Commented Sep 20, 2020 at 22:00

Jack Fleeting · Accepted Answer · 2020-09-21 01:50:54Z

1

Since the question isn't entirely clear, let's try it this way.

Assuming that your xml reads like this:

<?xml version="1.0" encoding="UTF-8"?>
<name1>
    <type id ="1">
        <coord>67</coord>
        <lmc>57657</lmc>
    </type>
    <lang>
        <eng>989</eng>
        <spa>123</spa>
    </lang>
</name1>
<name2>
    <type id ="2">
        <coord>534</coord>
        <lmc>654654</lmc>
    </type>
    <lang>
        <eng>354</eng>
        <spa>2424</spa>
    </lang>
</name2>
<name3>
    <type id ="3">
        <coord>23432</coord>
        <pmc>14324</pmc>
    </type>
    <lang>
        <eng>141</eng>
        <spa>142</spa>
    </lang>
</name3>

and that you are trying to get the value of the attribute <id> of any <type> node which has a <pmc> child node, try using the following as your xpath expression:

//*/type[pmc]/@id

answered Sep 21, 2020 at 1:50

Jack Fleeting

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