RestDataSource not able to get DSRequest oldValues

[ADA]

Hi,
I am using the below DataSource to bind to a list grid. While editing gird with listgrid.setCanEdit(true); I need to get the old values. I have read trough the posts here and also the documentations on ClientDataIntegration, DataSource, transformRequest RestDataSource etc. Still I am not able to get the oldValue and DSRequest dosen't seem to have the oldValue method.
Can anyone pls point what I am missing here.

public class OrgDS extends RestDataSource {

    private static OrgDS instance = null;
    
    public static OrgDS getInstance() {
        if (instance == null) {
          instance = new OrgDS("orgDS_XML");
        }
        return instance;
    }

       @Override
       public Object transformRequest(DSRequest dsRequest)
       {    	   
    	   if (dsRequest.getOperationType().equals(DSOperationType.UPDATE))
           {
        	  
        	   String strOrgId = JSOHelper.getAttribute(dsRequest.getData(), "orgId");
        	   String strdesc = JSOHelper.getAttribute(dsRequest.getData(), "orgDescription"); 
        	  
              dsRequest.setActionURL(Update URL);
           }
                     
          return super.transformRequest(dsRequest);
       }

    public OrgDS(String id) {
        setID(id);
        
        DataSourceIntegerField pkField = new DataSourceIntegerField("pk");
        pkField.setHidden(true);
        pkField.setPrimaryKey(true);
        
        DataSourceField orgIDField = new DataSourceField("orgId", FieldType.TEXT,"ID");
        
        DataSourceField orgNameField = new DataSourceField("orgName", FieldType.TEXT, "Organization");
        DataSourceField orgDescField = new DataSourceField("orgDescription", FieldType.TEXT, "Description");
        
        setFields(orgIDField, orgNameField, orgDescField);

        OperationBinding oppFetch = new OperationBinding(); 
        oppFetch.setDataFormat(DSDataFormat.XML);
        oppFetch.setOperationType(DSOperationType.FETCH);
        oppFetch.setDataProtocol(DSProtocol.GETPARAMS);
        oppFetch.setRecordXPath("/XDocument/XOrganization");        
        oppFetch.setDataURL(Fetch URL);
        
        OperationBinding oppUpdate = new OperationBinding(); 
        oppUpdate.setDataFormat(DSDataFormat.XML);
        oppUpdate.setOperationType(DSOperationType.UPDATE);
        oppUpdate.setDataProtocol(DSProtocol.GETPARAMS);
        
        //oppUpdate.setDataURL(Update URL);
        
        
        setOperationBindings(oppFetch,oppUpdate);
    }

}

[getaceres]

You have get the old value with:

JavaScriptObject oldObj = dsRequest.getAttributeAsJavaScriptObject("oldValues");

and then you can create a Record object with

Record inRecord = new Record(oldObj);

[ADA]

Thanks getacers. It works now.