/** * Checks if an {@link ExchangeRate} between two {@link CurrencyUnit} is * available from this provider. This method should check, if a given rate * is <i>currently</i> defined. * * @param conversionQuery the required {@link ConversionQuery}, not {@code null} * @return {@code true}, if such an {@link ExchangeRate} is currently * defined. */ default boolean isAvailable(ConversionQuery conversionQuery){ Objects.requireNonNull(conversionQuery); try{ return conversionQuery.getProviderNames().isEmpty() || conversionQuery.getProviderNames().contains(getContext().getProviderName()); } catch(Exception e){ return false; } }