Java Mapping Using DOM Parser.

Question

Hi Experts,
I am new to Java mapping and i have followed the link
http://scn.sap.com/thread/3173071 and it is working fine. It is for only one item. I have tried to modify the code and i placed a for loop to go create the Output Node based on the No of Input Nodes and it is giving the error as below. But my requirement is
Input.xml : -
<?xml version="1.0" encoding="UTF-8" ?>  
<ns0:DT_Source xmlns:ns0="urn:java_mapping2"> 
<Person1> 
      <Name>Alex</Name>  
      <Surname>Stewart</Surname>  
</Person1>
<Person1> 
      <Name>Sam</Name>  
      <Surname>Abdreson</Surname>  
</Person1>  
</ns0:DT_Source>
Output.xml:-
<?xml version="1.0" encoding="UTF-8" standalone="no"?> 
<ns0:DT_Target xmlns:ns0="urn:java_mapping2"> 
<Person2> 
     <EmpName> 
          <Emp>Alex Stewart</Emp> 
</EmpName> 
</Person2>
<Person2> 
     <EmpName> 
          <Emp>Sam Abdreson</Emp> 
</EmpName> 
</Person2>  
</ns0:DT_Target> 
I am unable to get the output. I am getting the following error.
org.w3c.dom.DOMException: HIERARCHY_REQUEST_ERR: An attempt was made to insert a node where it is not permitted.
at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.insertBefore()
at com.sun.org.apache.xerces.internal.dom.NodeImpl.appendChild()
Please suggest me how i can resolvoe this error.
Regards,
GIRIDHAR

Answer 1

Complete code
package test;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import com.sap.aii.mapping.api.AbstractTransformation;
import com.sap.aii.mapping.api.StreamTransformationException;
import com.sap.aii.mapping.api.TransformationInput;
import com.sap.aii.mapping.api.TransformationOutput;
import java.io.IOException;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class RemoveTag extends AbstractTransformation {
    public void execute(InputStream in,OutputStream out) throws StreamTransformationException, SAXException, IOException {  
        try
             DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
             DocumentBuilder builderel=factory.newDocumentBuilder();
             /*input document in form of XML*/
             Document docIn=builderel.parse(in);
             /*document after parsing*/
             Document docOut=builderel.newDocument();
             TransformerFactory tf=TransformerFactory.newInstance();
             Transformer transform=tf.newTransformer();
             Element root,child,child1,child2;
             Node textChild;
             Node name,surname;
             String fullname="";
             root=docOut.createElement("ns0:DT_Target");
             root.setAttribute("xmlns:ns0","urn:java_mapping2");
             NodeList nList = docIn.getElementsByTagName("Person1");
             for (int temp = 0; temp < nList.getLength(); temp++)
            child1=docOut.createElement("Person2");
             child=docOut.createElement("EmpName");
             child2=docOut.createElement("Emp");
             child.appendChild(child2);
             child1.appendChild(child);
             root.appendChild(child1);
             name=docIn.getElementsByTagName("Name").item(temp);
             surname=docIn.getElementsByTagName("Surname").item(temp);
             fullname=name.getFirstChild().getNodeValue()+" ";
             fullname+=surname.getFirstChild().getNodeValue();
             textChild=docOut.createTextNode(fullname);
             child2.appendChild(textChild);
             docOut.appendChild(root);  
             transform.transform(new DOMSource(docOut), new StreamResult(out));
        catch(Exception e)
             e.printStackTrace();
    public static void main(String[] args) {
        try{
            RemoveTag genFormat=new RemoveTag();
             FileInputStream in=new FileInputStream("C:\\Users\\Desktop\\aa.xml");
             FileOutputStream out=new FileOutputStream("C:\\Users\\Desktop\\output1.xml");
             genFormat.execute(in,out);
        catch(Exception e)
             e.printStackTrace();
@Override
public void transform(TransformationInput arg0, TransformationOutput arg1)
throws StreamTransformationException {
// TODO Auto-generated method stub
try {
    this.execute(arg0.getInputPayload().getInputStream(), arg1.getOutputPayload().getOutputStream());
} catch (SAXException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();