51 lines
1.6 KiB
Java
51 lines
1.6 KiB
Java
/*
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* PlotSquared, a land and world management plugin for Minecraft.
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* Copyright (C) IntellectualSites <https://intellectualsites.com>
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* Copyright (C) IntellectualSites team and contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package com.plotsquared.core.util;
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import org.checkerframework.checker.nullness.qual.NonNull;
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public final class HashUtil {
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private HashUtil() {
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}
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/**
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* Hashcode of a boolean array.<br>
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* - Used for traversing mega plots quickly.
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*
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* @param array Booleans to hash
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* @return hashcode
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*/
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public static int hash(final @NonNull boolean[] array) {
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if (array.length == 4) {
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if (!array[0] && !array[1] && !array[2] && !array[3]) {
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return 0;
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}
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return ((array[0] ? 1 : 0) << 3) + ((array[1] ? 1 : 0) << 2) + ((array[2] ? 1 : 0) << 1)
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+ (array[3] ? 1 : 0);
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}
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int n = 0;
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for (boolean anArray : array) {
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n = (n << 1) + (anArray ? 1 : 0);
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}
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return n;
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}
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}
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