package org.betterx.bclib.util;

import java.util.*;

public class CollectionsUtil {
    /**
     * Will return mutable copy of list.
     *
     * @param list {@link List} to make mutable.
     * @return {@link ArrayList} or original {@link List} if it is mutable.
     */
    public static <E> List<E> getMutable(List<E> list) {
        if (list instanceof ArrayList) {
            return list;
        }
        return new ArrayList<>(list);
    }

    /**
     * Will return mutable copy of set.
     *
     * @param set {@link Set} to make mutable.
     * @return {@link HashSet} or original {@link Set} if it is mutable.
     */
    public static <E> Set<E> getMutable(Set<E> set) {
        if (set instanceof HashSet) {
            return set;
        }
        return new HashSet<>(set);
    }

    /**
     * Will return mutable copy of map.
     *
     * @param map {@link Map} to make mutable.
     * @return {@link HashMap} or original {@link Map} if it is mutable.
     */
    public static <K, V> Map<K, V> getMutable(Map<K, V> map) {
        if (map instanceof HashMap) {
            return map;
        }
        return new HashMap<>(map);
    }
}