Problem with adding an XML node to an existent XML File

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Posts: 18

posted 12 years ago

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I got a problem when trying to write a new node to an xml file, basically the new node isn't appended to the file. I tried to write to another file, but in both cases, only the old data appears... what am I doing wrong? :S

Here's my code:

public void addXmlData(XmlData xmlData) throws XmlDataException {
        
        synchronized (this) {
            try {
                DocumentBuilderFactory dbfac = DocumentBuilderFactory.newInstance();
                DocumentBuilder docBuilder = dbfac.newDocumentBuilder();
                
                File file = new File("/home/myhome/an_xml_file.xml");
                
                Document doc = docBuilder.parse(file);
                
                XPath xpath = XPathFactory.newInstance().newXPath();
                
                String XmlDataName = xmlData.getXmlDataName();
                
                String search = "//XmlData[@name='" + XmlDataName + "']";
                
                XPathExpression expr = xpath.compile(search);
                
                Node result = (Node)expr.evaluate(doc, XPathConstants.NODE);
                
                if(result == null) {
                    Element XmlDataElement = doc.createElement("XmlData");
                    XmlDataElement.setAttribute("name", xmlData.getXmlDataName());
                    
                    Element descriptionElement = doc.createElement("XmlData-description");
                    descriptionElement.setTextXmlData(xmlData.getXmlDataDescription());
                    XmlDataElement.appendChild(descriptionElement);
                    
                    Element baseLocaleElement = doc.createElement("base-locale");
                    baseLocaleElement.setAttribute("locale", xmlData.getXmlDataLocale());
                    XmlDataElement.appendChild(baseLocaleElement);                    
                    
                    //set up a transformer
                    TransformerFactory transfac = TransformerFactory.newInstance();
                    Transformer trans = transfac.newTransformer();
                    trans.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
                    //trans.setOutputProperty(OutputKeys.INDENT, "yes");

//create string from xml tree
                    //File file2 = new File("/home/myhome/an_xml_file.xml");
                    //FileOutputStream output = new FileOutputStream(file);
                    //Result streamResult = new StreamResult(output);
                    
                    Result streamResult = new StreamResult(file);
                    DOMSource source = new DOMSource(doc);
                    trans.transform(source, streamResult);
                    
                    //output.close();

} else {
                    throw new XmlDataException("XmlData already exists"); 
                }

} catch (TransformerException ex) {
                Logger.getLogger(XmlDataManager.class.getName()).log(Level.SEVERE, null, ex);
            } catch (XPathExpressionException ex) {
                Logger.getLogger(XmlDataManager.class.getName()).log(Level.SEVERE, null, ex);
            } catch (SAXException ex) {
                Logger.getLogger(XmlDataManager.class.getName()).log(Level.SEVERE, null, ex);
            } catch (FileNotFoundException ex) {
                Logger.getLogger(XmlDataManager.class.getName()).log(Level.SEVERE, null, ex);
            } catch (IOException ex) {
                Logger.getLogger(XmlDataManager.class.getName()).log(Level.SEVERE, null, ex);
            } catch (ParserConfigurationException ex) {
                Logger.getLogger(XmlDataManager.class.getName()).log(Level.SEVERE, null, ex);
            }

}
        
}

Thanks in advance.

Pranav Raulkar

Ranch Hand

Posts: 73

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