Get element "text" by looking for it ID in XML (Stringtable for games) using StaX

user_12161481 0
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So far I've got a way to SELECT the element I want by it´s ID but I tried and can't get a way to get It´s content (message).

public static String GetText(String id) throws FileNotFoundException, XMLStreamException
{
    File file = new File("C:/Users/LENOVO/IdeaProjects/CasinoRoyale/src/Stringtable.xml");

    // Instance of the class which helps on reading tags
    XMLInputFactory factory = XMLInputFactory.newInstance();

    // Initializing the handler to access the tags in the XML file
    XMLEventReader eventReader = factory.createXMLEventReader(new FileReader(file));

    String text = "";

    // Checking the availability of the next tag
    while (eventReader.hasNext()) {
        XMLEvent xmlEvent = eventReader.nextEvent();
        Characters characters = xmlEvent.asCharacters();

        if (xmlEvent.isStartElement()) {
            StartElement startElement = xmlEvent.asStartElement();

            Iterator<Attribute> iterator = startElement.getAttributes();

            while (iterator.hasNext()) {
                Attribute attribute = iterator.next();
                QName name = attribute.getName();
                if ("id".equalsIgnoreCase(name.getLocalPart())) {

                    String currentId = String.valueOf(attribute.getValue());
                    if (currentId.equals(id))
                        text = characters.getData();
                    break;
                }
            }
        }
    }

    return text;

}

That's the method and It gives no error in the IDE so far.

<?xml version="1.0" encoding="UTF-8"?>
<Stringtable>
    <GameHelper id="welcomeTo">Welcome to Casino Royale!</GameHelper>

</Stringtable>

This is my short Stringtable.xml at the moment.

System.out.println(UtilitiesGame.GetText("welcomeTo"));

This is how I call it and it throws this Exception:

Exception in thread "main" java.lang.ClassCastException: class com.sun.xml.internal.stream.events.StartDocumentEvent cannot be cast to class javax.xml.stream.events.Characters (com.sun.xml.internal.stream.events.StartDocumentEvent and javax.xml.stream.events.Characters are in module java.xml of loader 'bootstrap') at java.xml/com.sun.xml.internal.stream.events.DummyEvent.asCharacters(DummyEvent.java:115) at UtilitiesGame.GetText(UtilitiesGame.java:66) at GameHelper.(GameHelper.java:67) at CasinoRoyale.main(CasinoRoyale.java:7)

What I want is that given ID (welcomeTo) I get "Welcome to Casino Royale!"

stax element xml java
1 Answers

The exception is thrown because the event reader is still pointed to the startElement.

You can easily fix it if you move the instanciation of the caracteres elements

Characters characters = xmlEvent.asCharacters();

Here the fix


    public static String GetText(String id) throws FileNotFoundException, XMLStreamException
    {    
        File file = new File("C:/Users/LENOVO/IdeaProjects/CasinoRoyale/src/Stringtable.xml");

        // Instance of the class which helps on reading tags
        XMLInputFactory factory = XMLInputFactory.newInstance();

        // Initializing the handler to access the tags in the XML file
        XMLEventReader eventReader = factory.createXMLEventReader(new FileReader(file));

        String text = "";

        // Checking the availability of the next tag
        while (eventReader.hasNext()) {
            XMLEvent xmlEvent = eventReader.nextEvent();

            if (xmlEvent.isStartElement())
            {
                // Characters characters = xmlEvent.asCharacters();
                StartElement startElement = xmlEvent.asStartElement();
                Iterator<Attribute> iterator = startElement.getAttributes();
                while (iterator.hasNext())
                {
                    Attribute attribute = iterator.next();
                    QName name = attribute.getName();
                    if ("id".equalsIgnoreCase(name.getLocalPart()))
                    {
                        String currentId = String.valueOf(attribute.getValue());
                        if (currentId.equals(id))
                        {
                            Characters characters = (Characters) eventReader.nextEvent();
                            text = characters.getData();
                        }
                        break;
                    }
                }
            }

        }
        return text;
    }
user_90998640
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