BatchingSpliterator.java

1 
package com.pivovarit.collectors;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Spliterator;
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import java.util.function.Consumer;
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import java.util.function.Function;
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import java.util.stream.Stream;
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import static java.util.stream.Stream.empty;
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import static java.util.stream.Stream.of;
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import static java.util.stream.StreamSupport.stream;
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/**
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 * @author Grzegorz Piwowarek
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 */
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final class BatchingSpliterator<T> implements Spliterator<List<T>> {
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    private final List<T> source;
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    private int maxChunks;
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    private int chunks;
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    private int chunkSize;
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    private int consumed;
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    BatchingSpliterator(List<T> list, int batches) {
27 2 1. <init> : changed conditional boundary → SURVIVED
2. <init> : negated conditional → KILLED
 
        if (batches < 1) {
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            throw new IllegalArgumentException("batches can't be lower than one");
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        }
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        source = list;
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        chunks = batches;
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        maxChunks = Math.min(list.size(), batches);
33 1 1. <init> : Replaced double division with multiplication → KILLED
 
        chunkSize = (int) Math.ceil(((double) source.size()) / batches);
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    }
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    static <T> Stream<List<T>> partitioned(List<T> list, int numberOfParts) {
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        int size = list.size();
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39 2 1. partitioned : changed conditional boundary → SURVIVED
2. partitioned : negated conditional → KILLED
 
        if (size <= numberOfParts) {
40 1 1. partitioned : replaced return value with Stream.empty for com/pivovarit/collectors/BatchingSpliterator::partitioned → KILLED
 
            return asSingletonListStream(list);
41 1 1. partitioned : negated conditional → KILLED
 
        } else if (size == 0) {
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            return empty();
43 1 1. partitioned : negated conditional → KILLED
 
        } else if (numberOfParts == 1) {
44 1 1. partitioned : replaced return value with Stream.empty for com/pivovarit/collectors/BatchingSpliterator::partitioned → KILLED
 
            return of(list);
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        } else {
46 1 1. partitioned : replaced return value with Stream.empty for com/pivovarit/collectors/BatchingSpliterator::partitioned → KILLED
 
            return stream(new BatchingSpliterator<>(list, numberOfParts), false);
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        }
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    }
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    private static <T> Stream<List<T>> asSingletonListStream(List<T> list) {
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        Stream.Builder<List<T>> acc = Stream.builder();
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        for (T t : list) {
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            acc.add(List.of(t));
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        }
55 1 1. asSingletonListStream : replaced return value with Stream.empty for com/pivovarit/collectors/BatchingSpliterator::asSingletonListStream → KILLED
 
        return acc.build();
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    }
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    static <T, R> Function<List<T>, List<R>> batching(Function<? super T, R> mapper) {
59 1 1. batching : replaced return value with null for com/pivovarit/collectors/BatchingSpliterator::batching → KILLED
 
        return batch -> {
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            List<R> list = new ArrayList<>(batch.size());
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            for (T t : batch) {
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                list.add(mapper.apply(t));
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            }
64 1 1. lambda$batching$0 : replaced return value with Collections.emptyList for com/pivovarit/collectors/BatchingSpliterator::lambda$batching$0 → KILLED
 
            return list;
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        };
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    }
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    @Override
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    public boolean tryAdvance(Consumer<? super List<T>> action) {
70 3 1. tryAdvance : changed conditional boundary → KILLED
2. tryAdvance : negated conditional → KILLED
3. tryAdvance : negated conditional → KILLED
 
        if (consumed < source.size() && chunks != 0) {
71 1 1. tryAdvance : Replaced integer addition with subtraction → KILLED
 
            List<T> batch = source.subList(consumed, Math.min(source.size(), consumed + chunkSize));
72 1 1. tryAdvance : Replaced integer addition with subtraction → KILLED
 
            consumed += chunkSize;
73 3 1. tryAdvance : Replaced integer subtraction with addition → KILLED
2. tryAdvance : Replaced integer subtraction with addition → KILLED
3. tryAdvance : Replaced double division with multiplication → KILLED
 
            chunkSize = (int) Math.ceil(((double) (source.size() - consumed)) / --chunks);
74 1 1. tryAdvance : removed call to java/util/function/Consumer::accept → KILLED
 
            action.accept(batch);
75 1 1. tryAdvance : replaced boolean return with false for com/pivovarit/collectors/BatchingSpliterator::tryAdvance → KILLED
 
            return true;
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        } else {
77 1 1. tryAdvance : replaced boolean return with true for com/pivovarit/collectors/BatchingSpliterator::tryAdvance → TIMED_OUT
 
            return false;
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        }
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    }
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    @Override
82 
    public Spliterator<List<T>> trySplit() {
83 1 1. trySplit : Replaced integer subtraction with addition → SURVIVED
 
        int remaining = source.size() - consumed;
84 4 1. trySplit : changed conditional boundary → SURVIVED
2. trySplit : changed conditional boundary → KILLED
3. trySplit : negated conditional → KILLED
4. trySplit : negated conditional → KILLED
 
        if (remaining <= chunkSize || chunks <= 1) {
85 
            return null;
86 
        }
87
88 1 1. trySplit : Replaced integer division with multiplication → KILLED
 
        int midChunks = chunks / 2;
89 1 1. trySplit : Replaced integer multiplication with division → KILLED
 
        int midSize = midChunks * chunkSize;
90
91 1 1. trySplit : Replaced integer addition with subtraction → KILLED
 
        var subList = source.subList(consumed, consumed + midSize);
92 
        var split = new BatchingSpliterator<>(subList, midChunks);
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94 1 1. trySplit : Replaced integer addition with subtraction → KILLED
 
        consumed += midSize;
95 1 1. trySplit : Replaced integer subtraction with addition → KILLED
 
        chunks -= midChunks;
96 1 1. trySplit : Replaced integer subtraction with addition → KILLED
 
        maxChunks -= midChunks;
97 2 1. trySplit : Replaced integer subtraction with addition → KILLED
2. trySplit : Replaced double division with multiplication → KILLED
 
        chunkSize = (int) Math.ceil(((double) (source.size() - consumed)) / chunks);
98
99 1 1. trySplit : replaced return value with null for com/pivovarit/collectors/BatchingSpliterator::trySplit → KILLED
 
        return split;
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    }
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    @Override
103 
    public long estimateSize() {
104 1 1. estimateSize : replaced long return with 0 for com/pivovarit/collectors/BatchingSpliterator::estimateSize → KILLED
 
        return maxChunks;
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    }
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    @Override
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    public int characteristics() {
109 1 1. characteristics : replaced int return with 0 for com/pivovarit/collectors/BatchingSpliterator::characteristics → SURVIVED
 
        return ORDERED | SIZED;
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    }
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}

Mutations

27

1.1
Location : <init>
Killed by : none changed conditional boundary → SURVIVED Covering tests

2.2
Location : <init>
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldReportCorrectSizeWhenMultipleBatches()] negated conditional → KILLED

33

1.1
Location : <init>
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldHandleExactDivisibility()] Replaced double division with multiplication → KILLED

39

1.1
Location : partitioned
Killed by : none changed conditional boundary → SURVIVED Covering tests

2.2
Location : partitioned
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldReturnSameListWhenBatchesIsOne()] negated conditional → KILLED

40

1.1
Location : partitioned
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldPartitionToSingletonsWhenSizeLessThanBatches()] replaced return value with Stream.empty for com/pivovarit/collectors/BatchingSpliterator::partitioned → KILLED

41

1.1
Location : partitioned
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldReturnSameListWhenBatchesIsOne()] negated conditional → KILLED

43

1.1
Location : partitioned
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldReportCorrectSizeWhenMultipleBatches()] negated conditional → KILLED

44

1.1
Location : partitioned
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldReturnSameListWhenBatchesIsOne()] replaced return value with Stream.empty for com/pivovarit/collectors/BatchingSpliterator::partitioned → KILLED

46

1.1
Location : partitioned
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldReportCorrectSizeWhenMultipleBatches()] replaced return value with Stream.empty for com/pivovarit/collectors/BatchingSpliterator::partitioned → KILLED

55

1.1
Location : asSingletonListStream
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldPartitionToSingletonsWhenSizeLessThanBatches()] replaced return value with Stream.empty for com/pivovarit/collectors/BatchingSpliterator::asSingletonListStream → KILLED

59

1.1
Location : batching
Killed by : com.pivovarit.collectors.test.BasicParallelismTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.test.BasicParallelismTest]/[test-factory:shouldProcessAllElementsWithMaxParallelism()]/[dynamic-test:#33] replaced return value with null for com/pivovarit/collectors/BatchingSpliterator::batching → KILLED

64

1.1
Location : lambda$batching$0
Killed by : com.pivovarit.collectors.test.BasicParallelismTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.test.BasicParallelismTest]/[test-factory:shouldProcessAllElementsWithMaxParallelism()]/[dynamic-test:#33] replaced return value with Collections.emptyList for com/pivovarit/collectors/BatchingSpliterator::lambda$batching$0 → KILLED

70

1.1
Location : tryAdvance
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldHandleEmptyList()] changed conditional boundary → KILLED

2.2
Location : tryAdvance
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldHandleEmptyList()] negated conditional → KILLED

3.3
Location : tryAdvance
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldHandleExactDivisibility()] negated conditional → KILLED

71

1.1
Location : tryAdvance
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldHandleExactDivisibility()] Replaced integer addition with subtraction → KILLED

72

1.1
Location : tryAdvance
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldHandleExactDivisibility()] Replaced integer addition with subtraction → KILLED

73

1.1
Location : tryAdvance
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldHandleExactDivisibility()] Replaced integer subtraction with addition → KILLED

2.2
Location : tryAdvance
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldNotExceedBoundsForUnevenSplit()] Replaced integer subtraction with addition → KILLED

3.3
Location : tryAdvance
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldNotExceedBoundsForUnevenSplit()] Replaced double division with multiplication → KILLED

74

1.1
Location : tryAdvance
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldHandleExactDivisibility()] removed call to java/util/function/Consumer::accept → KILLED

75

1.1
Location : tryAdvance
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldHandleExactDivisibility()] replaced boolean return with false for com/pivovarit/collectors/BatchingSpliterator::tryAdvance → KILLED

77

1.1
Location : tryAdvance
Killed by : none replaced boolean return with true for com/pivovarit/collectors/BatchingSpliterator::tryAdvance → TIMED_OUT

83

1.1
Location : trySplit
Killed by : none Replaced integer subtraction with addition → SURVIVED Covering tests

84

1.1
Location : trySplit
Killed by : none changed conditional boundary → SURVIVED Covering tests

2.2
Location : trySplit
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldHandleEmptyList()] changed conditional boundary → KILLED

3.3
Location : trySplit
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldHandleEmptyList()] negated conditional → KILLED

4.4
Location : trySplit
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldSplitAndProcessIndependently()] negated conditional → KILLED

88

1.1
Location : trySplit
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldSplitAndProcessIndependently()] Replaced integer division with multiplication → KILLED

89

1.1
Location : trySplit
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldSplitAndProcessIndependently()] Replaced integer multiplication with division → KILLED

91

1.1
Location : trySplit
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldSplitAndProcessIndependently()] Replaced integer addition with subtraction → KILLED

94

1.1
Location : trySplit
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldSplitAndProcessIndependently()] Replaced integer addition with subtraction → KILLED

95

1.1
Location : trySplit
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldSplitAndProcessIndependently()] Replaced integer subtraction with addition → KILLED

96

1.1
Location : trySplit
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldSplitAndProcessIndependently()] Replaced integer subtraction with addition → KILLED

97

1.1
Location : trySplit
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldSplitAndProcessIndependently()] Replaced integer subtraction with addition → KILLED

2.2
Location : trySplit
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldSplitAndProcessIndependently()] Replaced double division with multiplication → KILLED

99

1.1
Location : trySplit
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldSplitAndProcessIndependently()] replaced return value with null for com/pivovarit/collectors/BatchingSpliterator::trySplit → KILLED

104

1.1
Location : estimateSize
Killed by : com.pivovarit.collectors.BatchingSpliteratorTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.BatchingSpliteratorTest]/[method:shouldReportCorrectSizeWhenMultipleBatches()] replaced long return with 0 for com/pivovarit/collectors/BatchingSpliterator::estimateSize → KILLED

109

1.1
Location : characteristics
Killed by : none replaced int return with 0 for com/pivovarit/collectors/BatchingSpliterator::characteristics → SURVIVED Covering tests

Active mutators

Tests examined


Report generated by PIT 1.19.4