code: public static double convertToDouble (@Nullable final Object aSrcValue, final double dDefault)
    {
      final Double aValue = convert (aSrcValue, Double.class, null);
      return aValue == null ? dDefault : aValue.doubleValue ();
    }
docs: Convert the passed source value to double
  
  @param aSrcValue
  The source value. May be <code>null</code>.
  @param dDefault
  The default value to be returned if an error occurs during type
  conversion.
  @return The converted value.
  @throws RuntimeException
  If the converter itself throws an exception
  @see TypeConverterProviderBestMatch