code: @Override
  	public boolean isAvailable(ConversionQuery conversionQuery) {
          return conversionQuery.getBaseCurrency().getCurrencyCode()
                  .equals(conversionQuery.getCurrency().getCurrencyCode());
      }
docs: Check if this provider can provide a rate, which is only the case if base and term are equal.
  
  @param conversionQuery the required {@link ConversionQuery}, not {@code null}
  @return true, if the contained base and term currencies are known to this provider.