Grouped.java

1 
package com.pivovarit.collectors;
2
3 
import java.util.List;
4 
import java.util.Objects;
5 
import java.util.function.BiFunction;
6
7 
/**
8 
 * Represents a grouping of values under a specific key.
9 
 *
10 
 * @param <T>    the type of the key
11 
 * @param <V>    the type of the values
12 
 * @param key    the key of this group, must not be null
13 
 * @param values the list of values, must not be null
14 
 */
15 
public record Grouped<T, V>(T key, List<V> values) {
16
17 
    /**
18 
     * Constructs a new {@code Grouped} instance ensuring key and values are not null.
19 
     *
20 
     * @param key    the key, must not be null
21 
     * @param values the list of values, must not be null
22 
     */
23 
    public Grouped {
24 
        Objects.requireNonNull(key, "key cannot be null");
25 
        Objects.requireNonNull(values, "values cannot be null");
26 
    }
27
28 
    /**
29 
     * Creates a new {@code Grouped} instance with the given key and values.
30 
     *
31 
     * @param key    the key, must not be null
32 
     * @param values the list of values, must not be null
33 
     * @param <T>    the type of the key
34 
     * @param <V>    the type of the values
35 
     *
36 
     * @return a new {@code Grouped} instance
37 
     */
38 
    public static <T, V> Grouped<T, V> of(T key, List<V> values) {
39 1 1. of : replaced return value with null for com/pivovarit/collectors/Grouped::of → KILLED
 
        return new Grouped<>(key, values);
40 
    }
41
42 
    /**
43 
     * Transforms the values in this group using the provided mapper function.
44 
     *
45 
     * @param mapper the mapping function, must not be null
46 
     * @param <R>    the target type of the mapped values
47 
     *
48 
     * @return a new {@code Grouped} instance with the same key and the values produced by applying
49 
     * {@code mapper} to each element in this group's values
50 
     */
51 
    public <R> Grouped<T, R> map(BiFunction<? super T, ? super V, ? extends R> mapper) {
52 
        Objects.requireNonNull(mapper, "mapper cannot be null");
53 1 1. map : replaced return value with null for com/pivovarit/collectors/Grouped::map → KILLED
 
        return new Grouped<>(key, values.stream()
54 1 1. lambda$map$0 : replaced return value with null for com/pivovarit/collectors/Grouped::lambda$map$0 → KILLED
 
          .map(v -> mapper.apply(key, v))
55 1 1. lambda$map$1 : replaced return value with null for com/pivovarit/collectors/Grouped::lambda$map$1 → KILLED
 
          .map(a -> (R) a)
56 
          .toList());
57 
    }
58 
}

Mutations

39

1.1
Location : of
Killed by : com.pivovarit.collectors.GroupedTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.GroupedTest]/[nested-class:MapTest]/[method:mapShouldApplyMapperToAllValues()] replaced return value with null for com/pivovarit/collectors/Grouped::of → KILLED

53

1.1
Location : map
Killed by : com.pivovarit.collectors.GroupedTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.GroupedTest]/[nested-class:MapTest]/[method:mapShouldWorkOnEmptyValuesList()] replaced return value with null for com/pivovarit/collectors/Grouped::map → KILLED

54

1.1
Location : lambda$map$0
Killed by : com.pivovarit.collectors.GroupedTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.GroupedTest]/[nested-class:MapTest]/[method:mapShouldApplyMapperToAllValues()] replaced return value with null for com/pivovarit/collectors/Grouped::lambda$map$0 → KILLED

55

1.1
Location : lambda$map$1
Killed by : com.pivovarit.collectors.GroupedTest.[engine:junit-jupiter]/[class:com.pivovarit.collectors.GroupedTest]/[nested-class:MapTest]/[method:mapShouldApplyMapperToAllValues()] replaced return value with null for com/pivovarit/collectors/Grouped::lambda$map$1 → KILLED

Active mutators

Tests examined


Report generated by PIT 1.22.0