public FlowCollect<B, ArrayList<B>> toList() { return collect(new ArrayList<B>()); }
public FlowFirst<B> first() { return first((B) null); }
public <K> FlowToMap<K, List<B>, FlowGroup<K, B>> toMap(Supplier<Map<K, FlowGroup<K, B>>> groupMapSupplier, Mapper<B, K> toKey) { return toMap(groupMapSupplier, toKey, Flow.<K, B>flowGroupListMapper()); }
public <K> FlowGrouping<K, B, B, FlowGroup<K, B>> groupBy(final Mapper<? super B, K> toKey) { return groupBy(toKey, Flow.<K, FlowGroup<K, B>>hashMapSupplier()); }
@Test public void test_each_2() { final AtomicInteger counter = new AtomicInteger(); Flow.of(1, 2, 3) .groupBy(new Mapper<Integer, Boolean>() { @Override public Boolean map(Integer integer) { return integer % 2 == 0; } }) .each(new Consumer<FlowGroup<Boolean, Integer>>() { @Override public void consume(FlowGroup<Boolean, Integer> group) { counter.incrementAndGet(); } }).execute(); Assert.assertEquals(2, counter.get()); }
@Test public void test_grouping_1() { List<ArrayList<Integer>> result = Flow.of(1, 2, 3) .groupBy(new Mapper<Integer, Boolean>() { @Override public Boolean map(Integer it) { return it % 2 == 0; } }) .flatMap(new Mapper<FlowGroup<Boolean, Integer>, FlowProcessOnEnd<?, ArrayList<Integer>>>() { @Override public FlowProcessOnEnd<?, ArrayList<Integer>> map(FlowGroup<Boolean, Integer> group) { return group.toList(); } }) .toSortedList(new Comparator<List<Integer>>() { @Override public int compare(List<Integer> o1, List<Integer> o2) { return o1.size() < o2.size() ? -1 : (o1.size() == o2.size() ? 0 : 1); } }).get(); Assert.assertEquals(2, result.size()); Assert.assertEquals(1, result.get(0).size()); Assert.assertEquals(Integer.valueOf(2), result.get(0).get(0)); Assert.assertEquals(2, result.get(1).size()); Assert.assertEquals(Integer.valueOf(1), result.get(1).get(0)); Assert.assertEquals(Integer.valueOf(3), result.get(1).get(1)); }
@Test public void test_merge_2() { List<Integer> result = Flow.of(1, 2, 3, 4, 5, 6) .groupBy(new Mapper<Integer, Boolean>() { @Override public Boolean map(Integer integer) { return integer % 2 == 0; } }) .filter(new Filter<FlowGroup<Boolean, Integer>>() { @Override public boolean allow(FlowGroup<Boolean, Integer> group) { return group.getKey(); } }) .merge() .toList() .get(); Assert.assertEquals(3, result.size()); Assert.assertEquals(Integer.valueOf(2), result.get(0)); Assert.assertEquals(Integer.valueOf(4), result.get(1)); Assert.assertEquals(Integer.valueOf(6), result.get(2)); }
@Test public void test_limit_2() { Assert.assertEquals("1,2,3", Flow.of(1, 2, 3, 4, 5) .groupBy(new Mapper<Integer, Integer>() { @Override public Integer map(Integer integer) { return integer; } }) .limit(3) .map(new Mapper<FlowGroup<Integer, Integer>, Integer>() { @Override public Integer map(FlowGroup<Integer, Integer> group) { return group.key; } }) .join(",") .get()); }
@Test public void test_each_with_index_3() { final StringBuilder sb = new StringBuilder(); Flow.of(2, 4, 6) .each(new ConsumerWithInt<Integer>() { @Override public void consume(int i, Integer integer) { if (sb.length() != 0) sb.append(", "); sb.append(i); } }) .first() .get(); Assert.assertEquals("0", sb.toString()); }
@Test public void test_max_3() { Assert.assertEquals(Integer.valueOf(6), Flow.of(1, 2, 3) .max() .map(new Mapper<Integer, Integer>() { @Override public Integer map(Integer integer) { return integer * 2; } }).first().get() ); Assert.assertEquals(Integer.valueOf(6), Flow.of(3, 2, 1) .max() .map(new Mapper<Integer, Integer>() { @Override public Integer map(Integer integer) { return integer * 2; } }).first().get()); }
@Test public void test_reduce2() { Assert.assertEquals(Integer.valueOf(6), Flow.of(1, 2, 3).reduce(new Reducer<Integer>() { @Override public Integer reduce(Integer a, Integer b) { return a > b ? a : b; } }).map(new Mapper<Integer, Integer>() { @Override public Integer map(Integer integer) { return integer * 2; } }).first().get()); Assert.assertEquals(Integer.valueOf(6), Flow.of(3, 2, 1).reduce(new Reducer<Integer>() { @Override public Integer reduce(Integer a, Integer b) { return a > b ? a : b; } }).map(new Mapper<Integer, Integer>() { @Override public Integer map(Integer integer) { return integer * 2; } }).first().get()); }
@Test public void test_toMap() { Map<Boolean, List<Integer>> map = Flow.of(1, 2, 3) .toMap(new Mapper<Integer, Boolean>() { @Override public Boolean map(Integer integer) { return integer % 2 == 0; } }, Flow.<Boolean, Integer>flowGroupListMapper()) .get(); Assert.assertEquals(2, map.size()); Assert.assertEquals(1, map.get(true).size()); Assert.assertEquals(Integer.valueOf(2), map.get(true).get(0)); Assert.assertEquals(2, map.get(false).size()); Assert.assertEquals(Integer.valueOf(1), map.get(false).get(0)); Assert.assertEquals(Integer.valueOf(3), map.get(false).get(1)); }
@Test public void test_grouping_4() { final AtomicInteger counter = new AtomicInteger(); Integer result = Flow.of(1, 2, 3) .groupBy(new Mapper<Integer, Boolean>() { @Override public Boolean map(Integer it) { counter.incrementAndGet(); return it % 2 == 0; } }) .flatMap(new Mapper<FlowGroup<Boolean, Integer>, FlowProcessOnEnd<?, Integer>>() { @Override public FlowProcessOnEnd<?, Integer> map(FlowGroup<Boolean, Integer> group) { return group.first(); } }) .first() .get(); Assert.assertEquals(Integer.valueOf(1), result); Assert.assertEquals(1, counter.get()); }
@Test public void test_or_6() { Assert.assertEquals("2,4,6", Flow.of(1, 2, 3) .filter(new Filter<Integer>() { @Override public boolean allow(Integer integer) { return integer > 0; } }) .or(-1) .map(new Mapper<Integer, Integer>() { @Override public Integer map(Integer integer) { return integer * 2; } }) .join(",") .get()); }
@Test public void test_or_5() { Assert.assertEquals(Integer.valueOf(-2), Flow.of(1, 2, 3) .filter(new Filter<Integer>() { @Override public boolean allow(Integer integer) { return integer > 10; } }) .or(-1) .map(new Mapper<Integer, Integer>() { @Override public Integer map(Integer integer) { return integer * 2; } }) .first() .get()); }