GroupingByGatherer.java

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package com.pivovarit.gatherers;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Objects;
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import java.util.function.BiConsumer;
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import java.util.function.Function;
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import java.util.function.Supplier;
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import java.util.stream.Collector;
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import java.util.stream.Gatherer;
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import java.util.stream.Stream;
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record GroupingByGatherer<T, K, R>(Function<? super T, ? extends K> classifier,
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                                   Collector<? super T, ?, ? extends R> collector)
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  implements Gatherer<T, HashMap<K, Stream.Builder<T>>, Map.Entry<K, R>> {
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    GroupingByGatherer {
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        Objects.requireNonNull(classifier, "classifier can't be null");
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        Objects.requireNonNull(collector, "collector can't be null");
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    }
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    @Override
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    public Supplier<HashMap<K, Stream.Builder<T>>> initializer() {
24 1 1. initializer : replaced return value with null for com/pivovarit/gatherers/GroupingByGatherer::initializer → KILLED
 
        return HashMap::new;
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    }
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    @Override
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    public Integrator<HashMap<K, Stream.Builder<T>>, T, Map.Entry<K, R>> integrator() {
29 1 1. integrator : replaced return value with null for com/pivovarit/gatherers/GroupingByGatherer::integrator → KILLED
 
        return Integrator.ofGreedy((state, element, _) -> {
30 2 1. lambda$integrator$0 : removed call to java/util/stream/Stream$Builder::accept → KILLED
2. lambda$integrator$1 : replaced return value with null for com/pivovarit/gatherers/GroupingByGatherer::lambda$integrator$1 → KILLED
 
            state.computeIfAbsent(classifier.apply(element), _ -> Stream.builder()).accept(element);
31 1 1. lambda$integrator$0 : replaced boolean return with false for com/pivovarit/gatherers/GroupingByGatherer::lambda$integrator$0 → SURVIVED
 
            return true;
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        });
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    }
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    @Override
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    public BiConsumer<HashMap<K, Stream.Builder<T>>, Downstream<? super Map.Entry<K, R>>> finisher() {
37 2 1. lambda$finisher$0 : removed call to java/util/HashMap::forEach → KILLED
2. finisher : replaced return value with null for com/pivovarit/gatherers/GroupingByGatherer::finisher → KILLED
 
        return (map, downstream) -> map.forEach((key, builder) -> downstream.push(Map.entry(key, builder.build()
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          .collect(collector))));
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    }
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}

Mutations

24

1.1
Location : initializer
Killed by : com.pivovarit.gatherers.blackbox.GroupingByGathererTest.[engine:junit-jupiter]/[class:com.pivovarit.gatherers.blackbox.GroupingByGathererTest]/[method:shouldGroupEmptyWithCustomCollector()] replaced return value with null for com/pivovarit/gatherers/GroupingByGatherer::initializer → KILLED

29

1.1
Location : integrator
Killed by : com.pivovarit.gatherers.blackbox.GroupingByGathererTest.[engine:junit-jupiter]/[class:com.pivovarit.gatherers.blackbox.GroupingByGathererTest]/[method:shouldGroupToList()] replaced return value with null for com/pivovarit/gatherers/GroupingByGatherer::integrator → KILLED

30

1.1
Location : lambda$integrator$0
Killed by : com.pivovarit.gatherers.blackbox.GroupingByGathererTest.[engine:junit-jupiter]/[class:com.pivovarit.gatherers.blackbox.GroupingByGathererTest]/[method:shouldGroupToList()] removed call to java/util/stream/Stream$Builder::accept → KILLED

2.2
Location : lambda$integrator$1
Killed by : com.pivovarit.gatherers.blackbox.GroupingByGathererTest.[engine:junit-jupiter]/[class:com.pivovarit.gatherers.blackbox.GroupingByGathererTest]/[method:shouldGroupToList()] replaced return value with null for com/pivovarit/gatherers/GroupingByGatherer::lambda$integrator$1 → KILLED

31

1.1
Location : lambda$integrator$0
Killed by : none replaced boolean return with false for com/pivovarit/gatherers/GroupingByGatherer::lambda$integrator$0 → SURVIVED Covering tests

37

1.1
Location : lambda$finisher$0
Killed by : com.pivovarit.gatherers.blackbox.GroupingByGathererTest.[engine:junit-jupiter]/[class:com.pivovarit.gatherers.blackbox.GroupingByGathererTest]/[method:shouldGroupToList()] removed call to java/util/HashMap::forEach → KILLED

2.2
Location : finisher
Killed by : com.pivovarit.gatherers.blackbox.GroupingByGathererTest.[engine:junit-jupiter]/[class:com.pivovarit.gatherers.blackbox.GroupingByGathererTest]/[method:shouldGroupEmptyWithCustomCollector()] replaced return value with null for com/pivovarit/gatherers/GroupingByGatherer::finisher → KILLED

Active mutators

Tests examined


Report generated by PIT 1.21.0