src/game/java/net/minecraft/util/Graph.java

package net.minecraft.util;

import com.google.common.collect.ImmutableSet;
import java.util.Map;
import java.util.Set;
import java.util.function.Consumer;

public final class Graph {
    private Graph() {
    }

    public static <T> boolean depthFirstSearch(Map<T, Set<T>> p_184557_, Set<T> p_184558_, Set<T> p_184559_, Consumer<T> p_184560_, T p_184561_) {
        if (p_184558_.contains(p_184561_)) {
            return false;
        } else if (p_184559_.contains(p_184561_)) {
            return true;
        } else {
            p_184559_.add(p_184561_);

            for (T t : p_184557_.getOrDefault(p_184561_, ImmutableSet.of())) {
                if (depthFirstSearch(p_184557_, p_184558_, p_184559_, p_184560_, t)) {
                    return true;
                }
            }

            p_184559_.remove(p_184561_);
            p_184558_.add(p_184561_);
            p_184560_.accept(p_184561_);
            return false;
        }
    }
}