ContainerTrait.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\block\tile;
 
use pocketmine\data\bedrock\item\SavedItemStackData;
use pocketmine\inventory\Inventory;
use pocketmine\item\Item;
use pocketmine\nbt\NBT;
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\nbt\tag\ListTag;
use pocketmine\nbt\tag\StringTag;
use pocketmine\nbt\UnexpectedTagTypeException;
use pocketmine\world\Position;
 
trait ContainerTrait{
    private $lock = null;
 
    abstract public function getRealInventory() : Inventory;
 
    protected function loadItems(CompoundTag $tag) : void{
        try{
            $inventoryTag = $tag->getListTag(Container::TAG_ITEMS, CompoundTag::class);
        }catch(UnexpectedTagTypeException){
            //preserve the old behaviour of not throwing on wrong types
            $inventoryTag = null;
        }
        if($inventoryTag !== null){
            $inventory = $this->getRealInventory();
            $listeners = $inventory->getListeners()->toArray();
            $inventory->getListeners()->remove(...$listeners); //prevent any events being fired by initialization
 
            $newContents = [];
            $errorLogContext = "Container (" . $this->getPosition() . ")";
            foreach($inventoryTag as $itemNBT){
                $slotId = $itemNBT->getByte(SavedItemStackData::TAG_SLOT);
                $newContents[$slotId] = Item::safeNbtDeserialize($itemNBT, "$errorLogContext slot $slotId");
            }
            $inventory->setContents($newContents);
 
            $inventory->getListeners()->add(...$listeners);
        }
 
        if(($lockTag = $tag->getTag(Container::TAG_LOCK)) instanceof StringTag){
            $this->lock = $lockTag->getValue();
        }
    }
 
    protected function saveItems(CompoundTag $tag) : void{
        $items = [];
        foreach($this->getRealInventory()->getContents() as $slot => $item){
            $items[] = $item->nbtSerialize($slot);
        }
 
        $tag->setTag(Container::TAG_ITEMS, new ListTag($items, NBT::TAG_Compound));
 
        if($this->lock !== null){
            $tag->setString(Container::TAG_LOCK, $this->lock);
        }
    }
 
    public function canOpenWith(string $key) : bool{
        return $this->lock === null || $this->lock === $key;
    }
 
    abstract protected function getPosition() : Position;
 
    protected function onBlockDestroyedHook() : void{
        $inv = $this->getRealInventory();
        $pos = $this->getPosition();
 
        $world = $pos->getWorld();
        $dropPos = $pos->add(0.5, 0.5, 0.5);
        foreach($inv->getContents() as $k => $item){
            $world->dropItem($dropPos, $item);
        }
        $inv->clearAll();
    }
}