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PlotSquared, a land and world management plugin for Minecraft.
There is a newer version: 6.11.2
/*
 *       _____  _       _    _____                                _
 *      |  __ \| |     | |  / ____|                              | |
 *      | |__) | | ___ | |_| (___   __ _ _   _  __ _ _ __ ___  __| |
 *      |  ___/| |/ _ \| __|\___ \ / _` | | | |/ _` | '__/ _ \/ _` |
 *      | |    | | (_) | |_ ____) | (_| | |_| | (_| | | |  __/ (_| |
 *      |_|    |_|\___/ \__|_____/ \__, |\__,_|\__,_|_|  \___|\__,_|
 *                                    | |
 *                                    |_|
 *            PlotSquared plot management system for Minecraft
 *               Copyright (C) 2014 - 2022 IntellectualSites
 *
 *     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;

/**
 * plot functions
 *
 * @deprecated Do not use
 */
@Deprecated(forRemoval = true, since = "6.0.0")
public class MainUtil {

    /**
     * Cache of mapping x,y,z coordinates to the chunk array

     * - Used for efficient world generation

     */
    public static short[][] x_loc;
    public static short[][] y_loc;
    public static short[][] z_loc;
    public static short[][][] CACHE_I = null;
    public static short[][][] CACHE_J = null;

    /**
     * This cache is used for world generation and just saves a bit of calculation time when checking if something is in the plot area.
     */
    public static void initCache() {
        if (x_loc == null) {
            x_loc = new short[16][4096];
            y_loc = new short[16][4096];
            z_loc = new short[16][4096];
            for (int i = 0; i < 16; i++) {
                int i4 = i << 4;
                for (int j = 0; j < 4096; j++) {
                    int y = i4 + (j >> 8);
                    int a = j - ((y & 0xF) << 8);
                    int z1 = a >> 4;
                    int x1 = a - (z1 << 4);
                    x_loc[i][j] = (short) x1;
                    y_loc[i][j] = (short) y;
                    z_loc[i][j] = (short) z1;
                }
            }
        }
        if (CACHE_I == null) {
            CACHE_I = new short[256][16][16];
            CACHE_J = new short[256][16][16];
            for (int x = 0; x < 16; x++) {
                for (int z = 0; z < 16; z++) {
                    for (int y = 0; y < 256; y++) {
                        short i = (short) (y >> 4);
                        short j = (short) ((y & 0xF) << 8 | z << 4 | x);
                        CACHE_I[y][x][z] = i;
                        CACHE_J[y][x][z] = j;
                    }
                }
            }
        }
    }

}