code: public double getValue()
      {           // Get this field's value
          Boolean bField = (Boolean)this.getData(); // Get the physical data
          if (bField == null)
              return 0;
          boolean bValue = bField.booleanValue();
          if (bValue == false)
              return 0;
          else
              return 1;
      }
docs: Get the Value of this field as a double.
  For a boolean, return 0 for false 1 for true.
  @return The value of this field.