StreamRules

SUGGESTION

Simplification

View source code on GitHub

Suppression

Disable all rules by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$).* as compiler argument.

Table of contents

Joining
EmptyStream
StreamOfNullable
StreamOfArray
ConcatOneStream
ConcatTwoStreams
FilterOuterStreamAfterFlatMap
MapOuterStreamAfterFlatMap
FlatMapOuterStreamAfterFlatMap
StreamFilterSorted
StreamFilterSortedWithComparator
StreamDistinctSorted
StreamDistinctSortedWithComparator
StreamMapFirst
StreamFindAnyIsEmpty
StreamFindAnyIsPresent
StreamMapFilter
StreamMin
StreamMinNaturalOrder
StreamMax
StreamMaxNaturalOrder
StreamNoneMatch
StreamNoneMatch2
StreamAnyMatch
StreamAllMatch
StreamAllMatch2
StreamMapToIntSum
StreamMapToDoubleSum
StreamMapToLongSum
StreamMapToIntSummaryStatistics
StreamMapToDoubleSummaryStatistics
StreamMapToLongSummaryStatistics
StreamCount
StreamReduce
StreamReduceWithIdentity
StreamFilterCollect
StreamMapCollect
StreamFlatMapCollect
StreamsConcat
StreamTakeWhile
StreamIterate
StreamOf1
StreamOf2
StreamOf3
StreamOf4
StreamOf5
StreamsStream
CollectionParallelStream
CollectionsNCopiesStream

Joining

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("Joining") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$Joining).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 String testJoining() {
-  return Stream.of("foo").collect(joining(""));
+  return Stream.of("foo").collect(joining());
 }

EmptyStream

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("EmptyStream") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$EmptyStream).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Stream<?>> testEmptyStream() {
   return ImmutableSet.of(
-      Stream.of(),
-      Optional.empty().stream(),
-      ImmutableList.of().stream(),
+      Stream.empty(),
+      Stream.empty(),
+      Stream.empty(),
       ImmutableList.of("foo").reverse().stream(),
-      Streams.stream((Iterable<String>) ImmutableSet.<String>of()),
+      Stream.empty(),
       Streams.stream(ImmutableSet.of("bar")::iterator),
-      Streams.stream(ImmutableSet.of().iterator()),
+      Stream.empty(),
       Streams.stream(ImmutableSet.of("baz").iterator()),
-      Arrays.stream(new String[0]),
+      Stream.empty(),
       Arrays.stream(new String[] {"qux"}));
 }

StreamOfNullable

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamOfNullable") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamOfNullable).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Stream<String>> testStreamOfNullable() {
-  return ImmutableSet.of(
-      Stream.of("a").filter(Objects::nonNull), Optional.ofNullable("b").stream());
+  return ImmutableSet.of(Stream.ofNullable("a"), Stream.ofNullable("b"));
 }

StreamOfArray

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamOfArray") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamOfArray).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<String> testStreamOfArray() {
-  return Stream.of(new String[] {"foo", "bar"});
+  return Arrays.stream(new String[] {"foo", "bar"});
 }

ConcatOneStream

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("ConcatOneStream") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$ConcatOneStream).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testConcatOneStream() {
-  return Streams.concat(Stream.of(1));
+  return Stream.of(1);
 }

ConcatTwoStreams

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("ConcatTwoStreams") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$ConcatTwoStreams).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testConcatTwoStreams() {
-  return Streams.concat(Stream.of(1), Stream.of(2));
+  return Stream.concat(Stream.of(1), Stream.of(2));
 }

FilterOuterStreamAfterFlatMap

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("FilterOuterStreamAfterFlatMap") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$FilterOuterStreamAfterFlatMap).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testFilterOuterStreamAfterFlatMap() {
-  return Stream.of("foo").flatMap(v -> Stream.of(v.length()).filter(len -> len > 0));
+  return Stream.of("foo").flatMap(v -> Stream.of(v.length())).filter(len -> len > 0);
 }

MapOuterStreamAfterFlatMap

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("MapOuterStreamAfterFlatMap") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$MapOuterStreamAfterFlatMap).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testMapOuterStreamAfterFlatMap() {
-  return Stream.of("foo").flatMap(v -> Stream.of(v.length()).map(len -> len * 0));
+  return Stream.of("foo").flatMap(v -> Stream.of(v.length())).map(len -> len * 0);
 }

FlatMapOuterStreamAfterFlatMap

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("FlatMapOuterStreamAfterFlatMap") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$FlatMapOuterStreamAfterFlatMap).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testFlatMapOuterStreamAfterFlatMap() {
-  return Stream.of("foo").flatMap(v -> Stream.of(v.length()).flatMap(Stream::of));
+  return Stream.of("foo").flatMap(v -> Stream.of(v.length())).flatMap(Stream::of);
 }

StreamFilterSorted

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamFilterSorted") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamFilterSorted).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testStreamFilterSorted() {
-  return Stream.of(1).sorted().filter(i -> i % 2 == 0);
+  return Stream.of(1).filter(i -> i % 2 == 0).sorted();
 }

StreamFilterSortedWithComparator

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamFilterSortedWithComparator") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamFilterSortedWithComparator).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testStreamFilterSortedWithComparator() {
-  return Stream.of(1).sorted(reverseOrder()).filter(i -> i % 2 == 0);
+  return Stream.of(1).filter(i -> i % 2 == 0).sorted(reverseOrder());
 }

StreamDistinctSorted

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamDistinctSorted") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamDistinctSorted).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testStreamDistinctSorted() {
-  return Stream.of(1).sorted().distinct();
+  return Stream.of(1).distinct().sorted();
 }

StreamDistinctSortedWithComparator

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamDistinctSortedWithComparator") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamDistinctSortedWithComparator).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testStreamDistinctSortedWithComparator() {
-  return Stream.of(1).sorted(reverseOrder()).distinct();
+  return Stream.of(1).distinct().sorted(reverseOrder());
 }

StreamMapFirst

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMapFirst") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMapFirst).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Optional<Integer>> testStreamMapFirst() {
   return ImmutableSet.of(
-      Stream.of("foo").map(s -> s.length()).findFirst(),
-      Stream.of("bar").map(String::length).findFirst());
+      Stream.of("foo").findFirst().map(s -> s.length()),
+      Stream.of("bar").findFirst().map(String::length));
 }

StreamFindAnyIsEmpty

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamFindAnyIsEmpty") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamFindAnyIsEmpty).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Boolean> testStreamFindAnyIsEmpty() {
   return ImmutableSet.of(
-      Stream.of(1).count() == 0,
-      Stream.of(2).count() <= 0,
-      Stream.of(3).count() < 1,
-      Stream.of(4).findFirst().isEmpty(),
-      Stream.of(5).collect(toImmutableSet()).isEmpty(),
-      Stream.of(6).collect(collectingAndThen(toImmutableList(), List::isEmpty)),
-      Stream.of(7).collect(collectingAndThen(toImmutableList(), ImmutableList::isEmpty)),
-      Stream.of(8).collect(collectingAndThen(toImmutableMap(k -> k, v -> v), Map::isEmpty)),
-      Stream.of(9)
-          .collect(collectingAndThen(toImmutableMap(k -> k, v -> v), ImmutableMap::isEmpty)),
-      Stream.of(10).count() != 0,
-      Stream.of(11).count() > 0,
-      Stream.of(12).count() >= 1);
+      Stream.of(1).findAny().isEmpty(),
+      Stream.of(2).findAny().isEmpty(),
+      Stream.of(3).findAny().isEmpty(),
+      Stream.of(4).findAny().isEmpty(),
+      Stream.of(5).findAny().isEmpty(),
+      Stream.of(6).findAny().isEmpty(),
+      Stream.of(7).findAny().isEmpty(),
+      Stream.of(8).findAny().isEmpty(),
+      Stream.of(9).findAny().isEmpty(),
+      !Stream.of(10).findAny().isEmpty(),
+      !Stream.of(11).findAny().isEmpty(),
+      !Stream.of(12).findAny().isEmpty());
 }

StreamFindAnyIsPresent

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamFindAnyIsPresent") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamFindAnyIsPresent).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 boolean testStreamFindAnyIsPresent() {
-  return Stream.of(1).findFirst().isPresent();
+  return Stream.of(1).findAny().isPresent();
 }

StreamMapFilter

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMapFilter") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMapFilter).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testStreamMapFilter() {
-  return Stream.of("foo")
-      .filter(ImmutableMap.of(1, 2)::containsKey)
-      .map(ImmutableMap.of(1, 2)::get);
+  return Stream.of("foo").map(ImmutableMap.of(1, 2)::get).filter(Objects::nonNull);
 }

StreamMin

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMin") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMin).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Optional<String>> testStreamMin() {
   return ImmutableSet.of(
-      Stream.of("foo").max(comparingInt(String::length).reversed()),
-      Stream.of("bar").sorted(comparingInt(String::length)).findFirst(),
-      Stream.of("baz").collect(minBy(comparingInt(String::length))));
+      Stream.of("foo").min(comparingInt(String::length)),
+      Stream.of("bar").min(comparingInt(String::length)),
+      Stream.of("baz").min(comparingInt(String::length)));
 }

StreamMinNaturalOrder

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMinNaturalOrder") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMinNaturalOrder).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Optional<String>> testStreamMinNaturalOrder() {
   return ImmutableSet.of(
-      Stream.of("foo").max(reverseOrder()), Stream.of("bar").sorted().findFirst());
+      Stream.of("foo").min(naturalOrder()), Stream.of("bar").min(naturalOrder()));
 }

StreamMax

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMax") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMax).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Optional<String>> testStreamMax() {
   return ImmutableSet.of(
-      Stream.of("foo").min(comparingInt(String::length).reversed()),
-      Streams.findLast(Stream.of("bar").sorted(comparingInt(String::length))),
-      Stream.of("baz").collect(maxBy(comparingInt(String::length))));
+      Stream.of("foo").max(comparingInt(String::length)),
+      Stream.of("bar").max(comparingInt(String::length)),
+      Stream.of("baz").max(comparingInt(String::length)));
 }

StreamMaxNaturalOrder

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMaxNaturalOrder") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMaxNaturalOrder).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Optional<String>> testStreamMaxNaturalOrder() {
   return ImmutableSet.of(
-      Stream.of("foo").min(reverseOrder()), Streams.findLast(Stream.of("bar").sorted()));
+      Stream.of("foo").max(naturalOrder()), Stream.of("bar").max(naturalOrder()));
 }

StreamNoneMatch

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamNoneMatch") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamNoneMatch).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Boolean> testStreamNoneMatch() {
   Predicate<String> pred = String::isBlank;
   Function<String, Boolean> toBooleanFunction = Boolean::valueOf;
   return ImmutableSet.of(
-      !Stream.of("foo").anyMatch(s -> s.length() > 1),
-      Stream.of("bar").allMatch(not(String::isBlank)),
-      Stream.of("baz").allMatch(pred.negate()),
-      Stream.of("qux").filter(String::isEmpty).findAny().isEmpty(),
-      Stream.of("quux").map(s -> s.isBlank()).noneMatch(Boolean::booleanValue),
-      Stream.of("quuz").map(Boolean::valueOf).noneMatch(r -> r),
+      Stream.of("foo").noneMatch(s -> s.length() > 1),
+      Stream.of("bar").noneMatch(String::isBlank),
+      Stream.of("baz").noneMatch(pred),
+      Stream.of("qux").noneMatch(String::isEmpty),
+      Stream.of("quux").noneMatch(s -> s.isBlank()),
+      Stream.of("quuz").noneMatch(Boolean::valueOf),
       Stream.of("corge").map(toBooleanFunction).noneMatch(Boolean::booleanValue));
 }

StreamNoneMatch2

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamNoneMatch2") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamNoneMatch2).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Boolean> testStreamNoneMatch2() {
   return ImmutableSet.of(
-      Stream.of("foo").allMatch(s -> !s.isBlank()), Stream.of(Boolean.TRUE).allMatch(b -> !b));
+      Stream.of("foo").noneMatch(s -> s.isBlank()), Stream.of(Boolean.TRUE).noneMatch(b -> b));
 }

StreamAnyMatch

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamAnyMatch") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamAnyMatch).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Boolean> testStreamAnyMatch() {
   Function<String, Boolean> toBooleanFunction = Boolean::valueOf;
   return ImmutableSet.of(
-      !Stream.of("foo").noneMatch(s -> s.length() > 1),
-      Stream.of("bar").filter(String::isEmpty).findAny().isPresent(),
-      Stream.of("baz").map(s -> s.isBlank()).anyMatch(Boolean::booleanValue),
-      Stream.of("qux").map(Boolean::valueOf).anyMatch(r -> r),
+      Stream.of("foo").anyMatch(s -> s.length() > 1),
+      Stream.of("bar").anyMatch(String::isEmpty),
+      Stream.of("baz").anyMatch(s -> s.isBlank()),
+      Stream.of("qux").anyMatch(Boolean::valueOf),
       Stream.of("quux").map(toBooleanFunction).anyMatch(Boolean::booleanValue));
 }

StreamAllMatch

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamAllMatch") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamAllMatch).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Boolean> testStreamAllMatch() {
   Predicate<String> pred = String::isBlank;
   Function<String, Boolean> toBooleanFunction = Boolean::valueOf;
   return ImmutableSet.of(
-      Stream.of("foo").noneMatch(not(String::isBlank)),
-      Stream.of("bar").noneMatch(pred.negate()),
-      Stream.of("baz").map(s -> s.isBlank()).allMatch(Boolean::booleanValue),
-      Stream.of("qux").map(Boolean::valueOf).allMatch(r -> r),
+      Stream.of("foo").allMatch(String::isBlank),
+      Stream.of("bar").allMatch(pred),
+      Stream.of("baz").allMatch(s -> s.isBlank()),
+      Stream.of("qux").allMatch(Boolean::valueOf),
       Stream.of("quux").map(toBooleanFunction).anyMatch(Boolean::booleanValue));
 }

StreamAllMatch2

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamAllMatch2") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamAllMatch2).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 boolean testStreamAllMatch2() {
-  return Stream.of("foo").noneMatch(s -> !s.isBlank());
+  return Stream.of("foo").allMatch(s -> s.isBlank());
 }

StreamMapToIntSum

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMapToIntSum") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMapToIntSum).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Integer> testStreamMapToIntSum() {
   Function<String, Integer> parseIntFunction = Integer::parseInt;
   return ImmutableSet.of(
-      Stream.of("1").collect(summingInt(Integer::parseInt)),
-      Stream.of(2).map(i -> i * 2).reduce(0, Integer::sum),
-      Stream.of("3").map(Integer::parseInt).reduce(0, Integer::sum),
+      Stream.of("1").mapToInt(Integer::parseInt).sum(),
+      Stream.of(2).mapToInt(i -> i * 2).sum(),
+      Stream.of("3").mapToInt(Integer::parseInt).sum(),
       Stream.of("4").map(parseIntFunction).reduce(0, Integer::sum));
 }

StreamMapToDoubleSum

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMapToDoubleSum") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMapToDoubleSum).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Double> testStreamMapToDoubleSum() {
   Function<String, Double> parseDoubleFunction = Double::parseDouble;
   return ImmutableSet.of(
-      Stream.of("1").collect(summingDouble(Double::parseDouble)),
-      Stream.of(2).map(i -> i * 2.0).reduce(0.0, Double::sum),
-      Stream.of("3").map(Double::parseDouble).reduce(0.0, Double::sum),
+      Stream.of("1").mapToDouble(Double::parseDouble).sum(),
+      Stream.of(2).mapToDouble(i -> i * 2.0).sum(),
+      Stream.of("3").mapToDouble(Double::parseDouble).sum(),
       Stream.of("4").map(parseDoubleFunction).reduce(0.0, Double::sum));
 }

StreamMapToLongSum

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMapToLongSum") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMapToLongSum).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Long> testStreamMapToLongSum() {
   Function<String, Long> parseLongFunction = Long::parseLong;
   return ImmutableSet.of(
-      Stream.of("1").collect(summingLong(Long::parseLong)),
-      Stream.of(2).map(i -> i * 2L).reduce(0L, Long::sum),
-      Stream.of("3").map(Long::parseLong).reduce(0L, Long::sum),
+      Stream.of("1").mapToLong(Long::parseLong).sum(),
+      Stream.of(2).mapToLong(i -> i * 2L).sum(),
+      Stream.of("3").mapToLong(Long::parseLong).sum(),
       Stream.of("4").map(parseLongFunction).reduce(0L, Long::sum));
 }

StreamMapToIntSummaryStatistics

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMapToIntSummaryStatistics") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMapToIntSummaryStatistics).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 IntSummaryStatistics testStreamMapToIntSummaryStatistics() {
-  return Stream.of("1").collect(summarizingInt(Integer::parseInt));
+  return Stream.of("1").mapToInt(Integer::parseInt).summaryStatistics();
 }

StreamMapToDoubleSummaryStatistics

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMapToDoubleSummaryStatistics") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMapToDoubleSummaryStatistics).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 DoubleSummaryStatistics testStreamMapToDoubleSummaryStatistics() {
-  return Stream.of("1").collect(summarizingDouble(Double::parseDouble));
+  return Stream.of("1").mapToDouble(Double::parseDouble).summaryStatistics();
 }

StreamMapToLongSummaryStatistics

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMapToLongSummaryStatistics") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMapToLongSummaryStatistics).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 LongSummaryStatistics testStreamMapToLongSummaryStatistics() {
-  return Stream.of("1").collect(summarizingLong(Long::parseLong));
+  return Stream.of("1").mapToLong(Long::parseLong).summaryStatistics();
 }

StreamCount

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamCount") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamCount).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Long testStreamCount() {
-  return Stream.of(1).collect(counting());
+  return Stream.of(1).count();
 }

StreamReduce

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamReduce") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamReduce).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Optional<Integer> testStreamReduce() {
-  return Stream.of(1).collect(reducing(Integer::sum));
+  return Stream.of(1).reduce(Integer::sum);
 }

StreamReduceWithIdentity

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamReduceWithIdentity") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamReduceWithIdentity).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Integer testStreamReduceWithIdentity() {
-  return Stream.of(1).collect(reducing(0, Integer::sum));
+  return Stream.of(1).reduce(0, Integer::sum);
 }

StreamFilterCollect

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamFilterCollect") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamFilterCollect).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<String> testStreamFilterCollect() {
-  return Stream.of("1").collect(filtering(String::isEmpty, toImmutableSet()));
+  return Stream.of("1").filter(String::isEmpty).collect(toImmutableSet());
 }

StreamMapCollect

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamMapCollect") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamMapCollect).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Integer> testStreamMapCollect() {
-  return Stream.of("1").collect(mapping(Integer::parseInt, toImmutableSet()));
+  return Stream.of("1").map(Integer::parseInt).collect(toImmutableSet());
 }

StreamFlatMapCollect

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamFlatMapCollect") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamFlatMapCollect).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Integer> testStreamFlatMapCollect() {
-  return Stream.of(1).collect(flatMapping(n -> Stream.of(n, n), toImmutableSet()));
+  return Stream.of(1).flatMap(n -> Stream.of(n, n)).collect(toImmutableSet());
 }

StreamsConcat

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamsConcat") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamsConcat).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Stream<Integer>> testStreamsConcat() {
   return ImmutableSet.of(
-      Stream.of(Stream.of(1), Stream.of(2)).flatMap(identity()),
-      Stream.of(Stream.of(3), Stream.of(4)).flatMap(v -> v),
+      Streams.concat(Stream.of(1), Stream.of(2)),
+      Streams.concat(Stream.of(3), Stream.of(4)),
       Stream.of(Stream.of(5), Stream.of(6)).flatMap(v -> Stream.empty()));
 }

StreamTakeWhile

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamTakeWhile") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamTakeWhile).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testStreamTakeWhile() {
-  return Stream.of(1, 2, 3).takeWhile(i -> i < 2).filter(i -> i < 2);
+  return Stream.of(1, 2, 3).takeWhile(i -> i < 2);
 }

StreamIterate

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamIterate") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamIterate).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testStreamIterate() {
-  return Stream.iterate(0, i -> i + 1).takeWhile(i -> i < 10);
+  return Stream.iterate(0, i -> i < 10, i -> i + 1);
 }

StreamOf1

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamOf1") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamOf1).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testStreamOf1() {
-  return ImmutableList.of(1).stream();
+  return Stream.of(1);
 }

StreamOf2

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamOf2") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamOf2).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testStreamOf2() {
-  return ImmutableList.of(1, 2).stream();
+  return Stream.of(1, 2);
 }

StreamOf3

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamOf3") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamOf3).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testStreamOf3() {
-  return ImmutableList.of(1, 2, 3).stream();
+  return Stream.of(1, 2, 3);
 }

StreamOf4

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamOf4") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamOf4).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testStreamOf4() {
-  return ImmutableList.of(1, 2, 3, 4).stream();
+  return Stream.of(1, 2, 3, 4);
 }

StreamOf5

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamOf5") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamOf5).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<Integer> testStreamOf5() {
-  return ImmutableList.of(1, 2, 3, 4, 5).stream();
+  return Stream.of(1, 2, 3, 4, 5);
 }

StreamsStream

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("StreamsStream") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$StreamsStream).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<String> testStreamsStream() {
-  return StreamSupport.stream(Iterables.cycle("foo").spliterator(), false);
+  return Streams.stream(Iterables.cycle("foo"));
 }

CollectionParallelStream

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("CollectionParallelStream") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$CollectionParallelStream).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 Stream<String> testCollectionParallelStream() {
-  return StreamSupport.stream(ImmutableList.of("foo").spliterator(), true);
+  return ImmutableList.of("foo").parallelStream();
 }

CollectionsNCopiesStream

SUGGESTION

Simplification

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("CollectionsNCopiesStream") to the enclosing element.

Disable this rule by adding -XepOpt:Refaster:NamePattern=^(?!StreamRules\$CollectionsNCopiesStream).* as compiler argument.

Samples

Shows the difference in example code before and after the Refaster rule is applied.

 ImmutableSet<Stream<String>> testCollectionsNCopiesStream() {
   return ImmutableSet.of(
-      Stream.generate(() -> "foo").limit(1),
+      Collections.nCopies(1, "foo").stream(),
       Stream.generate(() -> UUID.randomUUID().toString()).limit(2));
 }