io.github.mike10004.nanochamp.server.MultimapShim Maven / Gradle / Ivy

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package io.github.mike10004.nanochamp.server;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

class MultimapShim {

    private MultimapShim() {

    }

    public static  Map> create() {
        return new HashMap>();
    }

    public static  void put(Map> map, K key, V value) {
        map.computeIfAbsent(key, k -> new ArrayList<>()).add(value);
    }

    public static  Map> copyOf(List> list) {
        Map> m = create();
        list.forEach(entry -> {
            put(m, entry.getKey(), entry.getValue());
        });
        return m;
    }
}