net.morimekta.collect.collectors.UnmodifiableSetCollector Maven / Gradle / Ivy

Go to download
package net.morimekta.collect.collectors;

import net.morimekta.collect.UnmodifiableSet;

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;

public class UnmodifiableSetCollector implements Collector, UnmodifiableSet> {
    @Override
    public Supplier> supplier() {
        return UnmodifiableSet::newBuilder;
    }

    @Override
    public BiConsumer, E> accumulator() {
        return UnmodifiableSet.Builder::add;
    }

    @Override
    public BinaryOperator> combiner() {
        return (b1, b2) -> b1.addAll(b2.build());
    }

    @Override
    public Function, UnmodifiableSet> finisher() {
        return UnmodifiableSet.Builder::build;
    }

    @Override
    public Set characteristics() {
        return UnmodifiableSet.setOf();
    }
}