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PlotSquared, a land and world management plugin for Minecraft.

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/*
 * PlotSquared, a land and world management plugin for Minecraft.
 * Copyright (C) IntellectualSites 
 * Copyright (C) IntellectualSites team and contributors
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package com.plotsquared.core.util;

import org.checkerframework.checker.nullness.qual.NonNull;

public final class HashUtil {

    private HashUtil() {
    }

    /**
     * Hashcode of a boolean array.

     * - Used for traversing mega plots quickly.
     *
     * @param array Booleans to hash
     * @return hashcode
     */
    public static int hash(final @NonNull boolean[] array) {
        if (array.length == 4) {
            if (!array[0] && !array[1] && !array[2] && !array[3]) {
                return 0;
            }
            return ((array[0] ? 1 : 0) << 3) + ((array[1] ? 1 : 0) << 2) + ((array[2] ? 1 : 0) << 1)
                    + (array[3] ? 1 : 0);
        }
        int n = 0;
        for (boolean anArray : array) {
            n = (n << 1) + (anArray ? 1 : 0);
        }
        return n;
    }

}