RegionLocationTableEntry.php

<?php
 
/*
 *
 *  ____            _        _   __  __ _                  __  __ ____
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 *
 *
 */
 
declare(strict_types=1);
 
namespace pocketmine\world\format\io\region;
 
use function range;
 
class RegionLocationTableEntry{
    private int $firstSector;
    private int $sectorCount;
    private int $timestamp;
 
    public function __construct(int $firstSector, int $sectorCount, int $timestamp){
        if($firstSector < 0 || $firstSector >= 2 ** 24){
            throw new \InvalidArgumentException("Start sector must be positive, got $firstSector");
        }
        $this->firstSector = $firstSector;
        if($sectorCount < 1){
            throw new \InvalidArgumentException("Sector count must be positive, got $sectorCount");
        }
        $this->sectorCount = $sectorCount;
        $this->timestamp = $timestamp;
    }
 
    public function getFirstSector() : int{
        return $this->firstSector;
    }
 
    public function getLastSector() : int{
        return $this->firstSector + $this->sectorCount - 1;
    }
 
    public function getUsedSectors() : array{
        return range($this->getFirstSector(), $this->getLastSector());
    }
 
    public function getSectorCount() : int{
        return $this->sectorCount;
    }
 
    public function getTimestamp() : int{
        return $this->timestamp;
    }
 
    public function overlaps(RegionLocationTableEntry $other) : bool{
        $overlapCheck = static function(RegionLocationTableEntry $entry1, RegionLocationTableEntry $entry2) : bool{
            $entry1Last = $entry1->getLastSector();
            $entry2Last = $entry2->getLastSector();
 
            return (
                ($entry2->firstSector >= $entry1->firstSector && $entry2->firstSector <= $entry1Last) ||
                ($entry2Last >= $entry1->firstSector && $entry2Last <= $entry1Last)
            );
        };
        return $overlapCheck($this, $other) || $overlapCheck($other, $this);
    }
}