How to convert role from one role to another role?

//Conversion of role from one type to another type & making the roles into inheritance::: -

<?xml version='1.0' encoding='UTF-8'?>

<!DOCTYPE Rule PUBLIC "sailpoint.dtd" "sailpoint.dtd">

<Rule language="beanshell"  name="Convert-Role">

  <Source>

  import sailpoint.object.Bundle;

  import sailpoint.object.Filter;

  import sailpoint.object.Identity;

  import sailpoint.object.QueryOptions;

  import sailpoint.tools.Util;

  import sailpoint.api.IncrementalObjectIterator;

  List  listofRoles = new ArrayList();

  Bundle container = context.getObjectByName(Bundle.class,"Legacy-Birthright-Roles");

  listofRoles.add(container);

  QueryOptions qo = new QueryOptions();

  qo.addFilter(Filter.eq("type", "IT"));

  //qo.addFilter(Filter.eq("name", "Contractor_BusinessRole"));

  IncrementalObjectIterator iterator = new IncrementalObjectIterator(context, Bundle.class,qo);

  while (iterator != null &amp;&amp; iterator.hasNext()) {

    Bundle bundle = iterator.next();

   // bundle.setType("birthright");

    bundle.setInheritance(listofRoles);

    context.saveObject(bundle);

    context.commitTransaction();

    context.decache();

  }

  Util.flushIterator(iterator);

  </Source>

</Rule>