code: @Override
      public ExchangeRate getReversed(ExchangeRate rate) {
          if (rate.getContext().getProviderName().equals(CONTEXT.getProviderName())) {
              return new ExchangeRateBuilder(rate.getContext()).setTerm(rate.getBaseCurrency())
                      .setBase(rate.getCurrency()).setFactor(new DefaultNumberValue(BigDecimal.ONE)).build();
          }
          return null;
      }
docs: /*
  (non-Javadoc)
  
  @see
  javax.money.convert.ExchangeRateProvider#getReversed(javax.money.convert
  .ExchangeRate)