@Override
public MonetarySummaryStatistics combine(MonetarySummaryStatistics summaryStatistics) {
Objects.requireNonNull(summaryStatistics);
if (!equals(summaryStatistics)) {
return this;
}
min = MonetaryFunctions.min(min, summaryStatistics.getMin());
max = MonetaryFunctions.max(max, summaryStatistics.getMax());
sum = sum.add(summaryStatistics.getSum());
count += summaryStatistics.getCount();
average = sum.divide(count);
return this;
}
@Test
public void summarizingMonetaryTest() {
MonetarySummaryStatistics summary =
currenciesToSummary()
.filter(isCurrency(BRAZILIAN_REAL))
.collect(summarizingMonetary(BRAZILIAN_REAL));
assertEquals(8L, summary.getCount());
assertEquals(0L, summary.getMin().getNumber().longValue());
assertEquals(10L, summary.getMax().getNumber().longValue());
assertEquals(16L, summary.getSum().getNumber().longValue());
assertEquals(2L, summary.getAverage().getNumber().longValue());
}