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package edu.stanford.protege.webprotege.hierarchy;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
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;

/**
 * Matthew Horridge
 * Stanford Center for Biomedical Informatics Research
 * 2021-04-21
 */
public class PathCollector implements Collector, Path> {

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

    @Override
    public BiConsumer, N> accumulator() {
        return List::add;
    }

    @Override
    public BinaryOperator> combiner() {
        return (firstList, secondList) -> {
            firstList.addAll(secondList);
            return firstList;
        };
    }

    @Override
    public Function, Path> finisher() {
        return Path::new;
    }

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

    public static  PathCollector toPath() {
        return new PathCollector<>();
    }
}