BlockStateDictionaryEntry.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\network\mcpe\convert;
 
use pocketmine\data\bedrock\block\BlockStateData;
use pocketmine\nbt\LittleEndianNbtSerializer;
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\nbt\tag\Tag;
use pocketmine\nbt\TreeRoot;
use function count;
use function ksort;
use const SORT_STRING;
 
final class BlockStateDictionaryEntry{
    private static array $uniqueRawStates = [];
 
    private string $rawStateProperties;
 
    public function __construct(
        private string $stateName,
        array $stateProperties,
        private int $meta
    ){
        $rawStateProperties = self::encodeStateProperties($stateProperties);
        $this->rawStateProperties = self::$uniqueRawStates[$rawStateProperties] ??= $rawStateProperties;
    }
 
    public function getStateName() : string{ return $this->stateName; }
 
    public function getRawStateProperties() : string{ return $this->rawStateProperties; }
 
    public function generateStateData() : BlockStateData{
        return new BlockStateData(
            $this->stateName,
            self::decodeStateProperties($this->rawStateProperties),
            BlockStateData::CURRENT_VERSION
        );
    }
 
    public function getMeta() : int{ return $this->meta; }
 
    public static function decodeStateProperties(string $rawProperties) : array{
        if($rawProperties === ""){
            return [];
        }
        return (new LittleEndianNbtSerializer())->read($rawProperties)->mustGetCompoundTag()->getValue();
    }
 
    public static function encodeStateProperties(array $properties) : string{
        if(count($properties) === 0){
            return "";
        }
        //TODO: make a more efficient encoding - NBT will do for now, but it's not very compact
        ksort($properties, SORT_STRING);
        $tag = new CompoundTag();
        foreach($properties as $k => $v){
            $tag->setTag($k, $v);
        }
        return (new LittleEndianNbtSerializer())->write(new TreeRoot($tag));
    }
}