We have this in the example cda

<DataSources>
        <Connection id="2" type="olap4j.jdbc">
            <Driver>mondrian.olap4j.MondrianOlap4jDriver</Driver>
            <Url>jdbc:mondrian:</Url>
            <Property name="JdbcUser">pentaho_user</Property>
            <Property name="JdbcPassword">password</Property>
            <Property name="Jdbc">jdbc:hsqldb:hsql://localhost:9001/sampledata</Property>
            <Property name="JdbcDrivers">org.hsqldb.jdbcDriver</Property>
            <Property name="Catalog">test/pt/webdetails/cda/tests/steelwheels.mondrian.xml</Property>
</Connection>

and need to get it into this

  private String driver;
  private String url;
  private String user;
  private String pass;
  private Properties properties;
  private String roleField;
  private String userField;
  private String passwordField;

so
a) what are releField, userField, passwordField?
b) where is do you tell it what cube to use?