Updating XML values

[Maha Hassan]

Hi,

I am trying to read from XML carry on some calculations and then update the XML document. I do not know how to do that. I tried reading the nodes using XPATH, updating them then creating a new XML with the new values but the error message of

[B]WRONG_DOCUMENT_ERR: A node is used in a different document than the one that created it.[/B]

keeps appearing. Can anyone help me with fixing that?

 
import javax.xml.xpath.*;
import javax.xml.*;
import javax.xml.xpath.XPathConstants;
import org.xml.sax.InputSource;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.*;
 
import org.xml.sax.*;  
import java.io.*;
import java.util.*;
import org.w3c.dom.Document;
import org.w3c.dom.DOMException;
import org.w3c.dom.Element;
import javax.xml.parsers.*;
import javax.xml.transform.* ;
import javax.xml.transform.dom.* ;
import javax.xml.transform.stream.StreamSource ;
import javax.xml.transform.stream.StreamResult ;
 
public class XpathQuery{

public static void main (String args[]){

String stmtExpr="//doc[id=0]/words/word";
 
XPath xpath = XPathFactory.newInstance().newXPath();
 
 InputSource inputSource = new InputSource("test.xml");
 
 try{
 
 NodeList l = (NodeList) xpath.evaluate(stmtExpr, inputSource,
 XPathConstants.NODESET);

System.out.println(l.getLength());
       if (l.getLength()!=0){
       for(int i =0;i<l.getLength(); i++){
       System.out.println(l.item(i).getChildNodes().item(1) .getTextContent());
       if(l.item(i).getChildNodes().item(1) .getTextContent().equals("consid")){
    l.item(i).getChildNodes().item(0) .setTextContent("756549");
       System.out.println(l.item(i).getChildNodes().item(0) .getTextContent());
       
DocumentBuilderFactory factory =DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.newDocument();
        Element root= (Element) document.createElement("root");
        document.appendChild(root);
        root.appendChild(l.item(i).getChildNodes().item(0));
        File file = new File("testtest.xml");
        TransformerFactory f = TransformerFactory.newInstance();
        Transformer t = f.newTransformer() ;
        Result res = new StreamResult(file);
        Source source =newDOMSource(document);
        t.transform(source,res);
        System.out.println("hello");
        break;
       }
 
       }
       }else{
       System.out.println("Sorry,no results were found");
       }
       
 }catch(Exception e){
 System.out.println(e);
 System.out.println(e.getCause());
 System.out.println(e.getStackTrace());
 System.out.println(e.getMessage());
 System.out.println(e.getCause());
 }
 

}
}

Thanks.
Maha Hassan

[ August 23, 2006: Message edited by: Maha Hassan ]

[ August 23, 2006: Message edited by: Maha Hassan ]

[ August 23, 2006: Message edited by: Maha Hassan ]
[ August 23, 2006: Message edited by: Maha Hassan ]

[Paul Clapham]

You'll want to use the importNode(Node) method of the Document you want to add those nodes to. Note that it returns a Node that can be added to the Document.