tile/Lectern.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\item\Item;
use pocketmine\item\WritableBookBase;
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\network\mcpe\convert\TypeConverter;
use function count;
 
class Lectern extends Spawnable{
    public const TAG_HAS_BOOK = "hasBook";
    public const TAG_PAGE = "page";
    public const TAG_TOTAL_PAGES = "totalPages";
    public const TAG_BOOK = "book";
 
    private int $viewedPage = 0;
    private ?WritableBookBase $book = null;
 
    public function readSaveData(CompoundTag $nbt) : void{
        $this->viewedPage = $nbt->getInt(self::TAG_PAGE, 0);
        if(($itemTag = $nbt->getCompoundTag(self::TAG_BOOK)) !== null){
            $book = Item::safeNbtDeserialize($itemTag, "Lectern ($this->position) book");
            if($book instanceof WritableBookBase && !$book->isNull()){
                $this->book = $book;
            }
        }
    }
 
    protected function writeSaveData(CompoundTag $nbt) : void{
        $nbt->setByte(self::TAG_HAS_BOOK, $this->book !== null ? 1 : 0);
        $nbt->setInt(self::TAG_PAGE, $this->viewedPage);
        if($this->book !== null){
            $nbt->setTag(self::TAG_BOOK, $this->book->nbtSerialize());
            $nbt->setInt(self::TAG_TOTAL_PAGES, count($this->book->getPages()));
        }
    }
 
    public function getViewedPage() : int{
        return $this->viewedPage;
    }
 
    public function setViewedPage(int $viewedPage) : void{
        $this->viewedPage = $viewedPage;
    }
 
    public function getBook() : ?WritableBookBase{
        return $this->book !== null ? clone $this->book : null;
    }
 
    public function setBook(?WritableBookBase $book) : void{
        $this->book = $book !== null && !$book->isNull() ? clone $book : null;
    }
 
    protected function addAdditionalSpawnData(CompoundTag $nbt) : void{
        $nbt->setByte(self::TAG_HAS_BOOK, $this->book !== null ? 1 : 0);
        $nbt->setInt(self::TAG_PAGE, $this->viewedPage);
        if($this->book !== null){
            $nbt->setTag(self::TAG_BOOK, TypeConverter::getInstance()->getItemTranslator()->toNetworkNbt($this->book));
            $nbt->setInt(self::TAG_TOTAL_PAGES, count($this->book->getPages()));
        }
    }
}