me.lucko.luckperms.common.utils.ImmutableCollectors.java Source code

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Here is the source code for me.lucko.luckperms.common.utils.ImmutableCollectors.java

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/*
 * Copyright (c) 2016 Lucko (Luck) <luck@lucko.me>
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to deal
 *  in the Software without restriction, including without limitation the rights
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in all
 *  copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 *  SOFTWARE.
 */

package me.lucko.luckperms.common.utils;

import lombok.experimental.UtilityClass;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;

import java.util.function.Function;
import java.util.stream.Collector;

@UtilityClass
public class ImmutableCollectors {

    public static <T, K, V> Collector<T, ImmutableMap.Builder<K, V>, ImmutableMap<K, V>> toImmutableMap(
            Function<? super T, ? extends K> keyMapper, Function<? super T, ? extends V> valueMapper) {
        return Collector.of(ImmutableMap.Builder<K, V>::new,
                (r, t) -> r.put(keyMapper.apply(t), valueMapper.apply(t)), (l, r) -> l.putAll(r.build()),
                ImmutableMap.Builder::build, Collector.Characteristics.UNORDERED);
    }

    public static <T> Collector<T, ImmutableSet.Builder<T>, ImmutableSet<T>> toImmutableSet() {
        return Collector.of(ImmutableSet.Builder<T>::new, ImmutableSet.Builder<T>::add,
                (l, r) -> l.addAll(r.build()), ImmutableSet.Builder<T>::build, Collector.Characteristics.UNORDERED);
    }

    public static <T> Collector<T, ImmutableList.Builder<T>, ImmutableList<T>> toImmutableList() {
        return Collector.of(ImmutableList.Builder<T>::new, ImmutableList.Builder<T>::add,
                (l, r) -> l.addAll(r.build()), ImmutableList.Builder<T>::build);
    }

}