44 lines
1.7 KiB
Java
44 lines
1.7 KiB
Java
/*
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* Minecraft Forge
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* Copyright (c) 2016-2019.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package net.minecraftforge.fml.loading;
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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.stream.Collector;
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import java.util.stream.Stream;
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public class Java9BackportUtils
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{
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public static <T, U, A, R>
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Collector<T, ?, R> flatMapping(Function<? super T, ? extends Stream<? extends U>> mapper,
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Collector<? super U, A, R> downstream) {
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BiConsumer<A, ? super U> downstreamAccumulator = downstream.accumulator();
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return Collector.of(downstream.supplier(),
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(r, t) -> {
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try (Stream<? extends U> result = mapper.apply(t)) {
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if (result != null)
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result.sequential().forEach(u -> downstreamAccumulator.accept(r, u));
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}
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},
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downstream.combiner(), downstream.finisher(),
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downstream.characteristics().toArray(new Collector.Characteristics[0]));
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}
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}
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