Java Mapping using DOM

Question

Hi All,
I need Java mapping help. I will get incomming payload as following
<orders>
<matnr>123</matnr>
<qty>10</qty>
</orders>
i need to change the above payload as follows
<ns0:orders>
<ns0:matnr>123</ns0:matnr>
<ns0:qty>10</ns0:qty>
</ns0:orders>
Please help me how to achieve this using Java mapping.
Regards
Vijay

Answer 1

Hi,
Dom will be quite expensive for this type of requirement since you will have to go to each element and then append the namespace.
I suggest you use SAX parser which is more  efficient for such requirement.
The code is given below you can modify it according to your requirement.
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class SAXDemo extends DefaultHandler{
     public StringBuffer sb = new StringBuffer();
     public String PREFIX = "ns0:";
     int count = 1;
     public static void main(String[] args)
          SAXDemo demo= new SAXDemo();
          demo.saxdemo();
          System.out.println();
     public void saxdemo()
          InputStream in;
          try
               in = new FileInputStream(new File("Input.xml"));
               SAXParserFactory factory = SAXParserFactory.newInstance();
               factory.setNamespaceAware(true);
               factory.setValidating(false);
               SAXParser saxParser = factory.newSAXParser();
               * Parse the content of the given {@link java.io.InputStream}
               * instance as XML using the specified
               * {@link org.xml.sax.helpers.DefaultHandler}.
               * @param inputstream InputStream containing the content to be parsed.
               * @param cobject The SAX DefaultHandler to use.
               * @exception IOException If any IO errors occur.
               * @exception IllegalArgumentException If the given InputStream is null.
               * @exception SAXException If the underlying parser throws a
               * SAXException while parsing.               
               saxParser.parse(in, this);
               System.out.println(sb.toString());
          catch (FactoryConfigurationError e)
               e.printStackTrace();
          catch (ParserConfigurationException e)
               e.printStackTrace();
          catch (SAXException e)
               e.printStackTrace();
          catch (IOException e)
               e.printStackTrace();
     public void startDocument()throws SAXException
     public void endDocument()throws SAXException
     public void startElement(String namespaceURI, String name, String qName, Attributes attrs)
     throws SAXException
          if(count == 1)
               sb.append("<"+PREFIX+qName+" "+PREFIX+"xmlns="+namespaceURI+">");
          else
               sb.append("<"+name+">");
          count ++;
     public void endElement(String uri, String name, String qName) throws SAXException
          sb.append("</"+qName+">");
     public void characters(char buf[], int offset, int len)
     throws SAXException
          String s = new String(buf, offset, len);
          buf  = null;
          sb.append(s.trim());
               s = null;
Regards
Fariha