Grouped.java

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/*
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 * Copyright 2014-2026 Grzegorz Piwowarek, https://4comprehension.com/
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 * https://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.pivovarit.collectors;
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import java.util.List;
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import java.util.Objects;
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import java.util.function.BiFunction;
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/**
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 * Represents a grouping of values under a specific key.
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 *
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 * @param <T>    the type of the key
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 * @param <V>    the type of the values
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 * @param key    the key of this group, must not be null
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 * @param values the list of values, must not be null
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 */
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public record Grouped<T, V>(T key, List<V> values) {
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    /**
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     * Constructs a new {@code Grouped} instance ensuring key and values are not null.
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     *
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     * @param key    the key, must not be null
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     * @param values the list of values, must not be null
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     */
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    public Grouped {
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        Objects.requireNonNull(key, "key cannot be null");
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        Objects.requireNonNull(values, "values cannot be null");
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    }
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    /**
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     * Creates a new {@code Grouped} instance with the given key and values.
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     *
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     * @param key    the key, must not be null
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     * @param values the list of values, must not be null
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     * @param <T>    the type of the key
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     * @param <V>    the type of the values
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     *
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     * @return a new {@code Grouped} instance
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     */
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    public static <T, V> Grouped<T, V> of(T key, List<V> values) {
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        return new Grouped<>(key, values);
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    }
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    /**
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     * Transforms the values in this group using the provided mapper function.
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     *
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     * @param mapper the mapping function, must not be null
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     * @param <R>    the target type of the mapped values
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     *
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     * @return a new {@code Grouped} instance with the same key and the values produced by applying
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     * {@code mapper} to each element in this group's values
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     */
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    public <R> Grouped<T, R> map(BiFunction<? super T, ? super V, ? extends R> mapper) {
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        Objects.requireNonNull(mapper, "mapper cannot be null");
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        return new Grouped<>(key, values.stream()
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          .map(v -> mapper.apply(key, v))
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          .map(a -> (R) a)
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          .toList());
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    }
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}

Mutations

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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

68

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

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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

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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