org.omnifaces.utils.stream.ReversedStreamCollector Maven / Gradle / Ivy

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package org.omnifaces.utils.stream;

import static java.util.Collections.emptySet;

import java.util.LinkedList;
import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collector;
import java.util.stream.Stream;

class ReversedStreamCollector implements Collector, Stream> {

	@Override
	public Supplier> supplier() {
		return LinkedList::new;
	}

	@Override
	public BiConsumer, T> accumulator() {
		return LinkedList::addFirst;
	}

	@Override
	public BinaryOperator> combiner() {
		return (t1, t2) -> {
			t2.addAll(t1);

			return t2;
		};
	}

	@Override
	public Function, Stream> finisher() {
		return LinkedList::stream;
	}

	@Override
	public Set characteristics() {
		return emptySet();
	}

}