ItemDeserializer.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\data\bedrock\item;
 
use pocketmine\block\Block;
use pocketmine\block\RuntimeBlockStateRegistry;
use pocketmine\data\bedrock\block\BlockStateDeserializeException;
use pocketmine\data\bedrock\block\BlockStateDeserializer;
use pocketmine\data\bedrock\block\convert\UnsupportedBlockStateException;
use pocketmine\data\bedrock\item\SavedItemData as Data;
use pocketmine\item\Durable;
use pocketmine\item\Item;
use pocketmine\nbt\NbtException;
use function min;
 
final class ItemDeserializer{
    private array $deserializers = [];
 
    public function __construct(
        private BlockStateDeserializer $blockStateDeserializer
    ){
        new ItemSerializerDeserializerRegistrar($this, null);
    }
 
    public function map(string $id, \Closure $deserializer) : void{
        $this->deserializers[$id] = $deserializer;
    }
 
    public function getDeserializerForId(string $id) : ?\Closure{
        return $this->deserializers[$id] ?? null;
    }
 
    public function mapBlock(string $id, \Closure $deserializer) : void{
        $this->map($id, fn(Data $data) => $deserializer($data)->asItem());
    }
 
    public function deserializeType(Data $data) : Item{
        if(($blockData = $data->getBlock()) !== null){
            //TODO: this is rough duct tape; we need a better way to deal with this
            try{
                $block = $this->blockStateDeserializer->deserialize($blockData);
            }catch(UnsupportedBlockStateException $e){
                throw new UnsupportedItemTypeException($e->getMessage(), 0, $e);
            }catch(BlockStateDeserializeException $e){
                throw new ItemTypeDeserializeException("Failed to deserialize item data: " . $e->getMessage(), 0, $e);
            }
 
            //TODO: worth caching this or not?
            return RuntimeBlockStateRegistry::getInstance()->fromStateId($block)->asItem();
        }
        $id = $data->getName();
        if(!isset($this->deserializers[$id])){
            throw new UnsupportedItemTypeException("No deserializer found for ID $id");
        }
 
        return ($this->deserializers[$id])($data);
    }
 
    public function deserializeStack(SavedItemStackData $data) : Item{
        $itemStack = $this->deserializeType($data->getTypeData());
 
        $itemStack->setCount($data->getCount());
        if(($tagTag = $data->getTypeData()->getTag()) !== null){
            try{
                $itemStack->setNamedTag(clone $tagTag);
            }catch(NbtException $e){
                throw new ItemTypeDeserializeException("Invalid item saved NBT: " . $e->getMessage(), 0, $e);
            }
        }
 
        //TODO: this hack is necessary to get legacy tools working - we need a better way to handle this kind of stuff
        if($itemStack instanceof Durable && $itemStack->getDamage() === 0 && ($damage = $data->getTypeData()->getMeta()) > 0){
            $itemStack->setDamage(min($damage, $itemStack->getMaxDurability()));
        }
 
        //TODO: canDestroy, canPlaceOn, wasPickedUp are currently unused
 
        return $itemStack;
    }
}