Context change by DOM parsing Java Mapping in XI

Question

Hi Team,
I would like to know that how can I handle Context Change by DOM Parser Java Mapping in XI.?
Suppose  the source XML structure I have like below:
<?xml version="1.0" encoding="UTF-8"?>
<ns0:Header xmlns:ns0="urn:bp:xi:hr:edm:test:100">
   <FileName>
      <filesub>
         <subname>a</subname>
         <subname>b</subname>
         <subname>c</subname>
      </filesub>
   </FileName>
   <FileName>
      <filesub>
         <subname>d</subname>
         <subname>e</subname>
         <subname>f</subname>
      </filesub>
   </FileName>
</ns0:Header>
Where the field FileName can occur maximum thrice(0...3) but the subname field is (0....unbounded) but in the target source I would like to have as given below:
<?xml version="1.0" encoding="UTF-8" ?>
- <MT_Test4 xmlns="urn:bp:xi:hr:edm:test:100">
- <Header>
  <FileName>a</FileName>
  <FileName1>d</FileName1>
    </Header>
- <Header>
  <FileName>b</FileName>
  <FileName1>e</FileName1>
   </Header>
Header>
  <FileName>c</FileName>
  <FileName1>f</FileName1>
   </Header>
</MT_Test4>
That means the first value from every context of the source field is forming my first and second value in my target first context.Thensecond value from every context is forming my 1st and 2nd value of my target 2nd context and finally 3rd value of every context is forming my 1st and 2nd value of my target 3rd context.Is this possible to done through DOM parsing or we have to do it by UDF only?

Answer 1

Hi Atanu,
    In my last post I gave an alogorithm to solve the mapping problem. Here is the complete program for the mapping.
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
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 javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.sap.aii.mapping.api.StreamTransformation;
import com.sap.aii.mapping.api.StreamTransformationException;
public class DOMParser1  implements StreamTransformation{
     public void execute(InputStream in, OutputStream out)
               throws StreamTransformationException {
          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=null;
               Node textChild;
               NodeList l;
               int i,n1,j,div,k;
               String s[];
               root=docOut.createElement("MT_Test4");
               root.setAttribute("xmlns","urn:bp:xi:hr:edm:test:100");
               l=docIn.getElementsByTagName("subname");
               n1=l.getLength();
               s=new String[n1];
               for(i=0;i<n1;++i)
                         s<i>=l.item(i).getFirstChild().getNodeValue();
               l=docIn.getElementsByTagName("filesub");
               div=l.getLength();
               j=n1/div;
               for(i=0,k=0;i<j;++i)
                    child1=docOut.createElement("Header");
                    root.appendChild(child1);
                    child=docOut.createElement("FileName");
                    textChild=docOut.createTextNode(s[k]);
                    child.appendChild(textChild);
                    child1.appendChild(child);
                    child=docOut.createElement("FileName1");
                    textChild=docOut.createTextNode(s [ k + j ]);
                    child.appendChild(textChild);
                    child1.appendChild(child);
                    ++k;
               docOut.appendChild(root);
               transform.transform(new DOMSource(docOut), new StreamResult(out));     
          catch(Exception e)
               e.printStackTrace();
     public void setParameter(Map arg0) {
     public static void main(String[] args) {
          try{
               DOMParser1 genFormat=new DOMParser1();
               FileInputStream in=new FileInputStream("C:/Apps/my dw/sdnq/apps.xml");
               FileOutputStream out=new FileOutputStream("C:/Apps/my dw/sdnq/tgt1.xml");
               genFormat.execute(in,out);
          catch(Exception e)
               e.printStackTrace();
source ->  apps.xml
<?xml version="1.0" encoding="UTF-8" ?>
- <ns0:Header xmlns:ns0="urn:bp:xi:hr:edm:test:100">
- <FileName>
- <filesub>
  <subname>a</subname>
  <subname>b</subname>
  <subname>c</subname>
  </filesub>
  </FileName>
- <FileName>
- <filesub>
  <subname>d</subname>
  <subname>e</subname>
  <subname>f</subname>
  </filesub>
  </FileName>
  </ns0:Header>
target structure ->  tgt1.xml
<?xml version="1.0" encoding="UTF-8" ?>
- <MT_Test4 xmlns="urn:bp:xi:hr:edm:test:100">
- <Header>
  <FileName>a</FileName>
  <FileName1>d</FileName1>
  </Header>
- <Header>
  <FileName>b</FileName>
  <FileName1>e</FileName1>
  </Header>
- <Header>
  <FileName>c</FileName>
  <FileName1>f</FileName1>
  </Header>
  </MT_Test4>
Hope this helps
one more thing  in this line "textChild=docOut.createTextNode(s k + j );"   somehow the the third braces one opening  before k and one closing after j is missing for unknown reasons. Please correct it when you actually run this code.
regards
Anupam
Edited by: anupamsap on Mar 7, 2011 12:47 PM