EntityFactory.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\entity;
 
use DaveRandom\CallbackValidator\CallbackType;
use DaveRandom\CallbackValidator\ParameterType;
use DaveRandom\CallbackValidator\ReturnType;
use pocketmine\block\RuntimeBlockStateRegistry;
use pocketmine\data\bedrock\LegacyEntityIdToStringIdMap;
use pocketmine\data\bedrock\PotionTypeIdMap;
use pocketmine\data\bedrock\PotionTypeIds;
use pocketmine\data\SavedDataLoadingException;
use pocketmine\entity\EntityDataHelper as Helper;
use pocketmine\entity\object\EndCrystal;
use pocketmine\entity\object\ExperienceOrb;
use pocketmine\entity\object\FallingBlock;
use pocketmine\entity\object\ItemEntity;
use pocketmine\entity\object\Painting;
use pocketmine\entity\object\PaintingMotive;
use pocketmine\entity\object\PrimedTNT;
use pocketmine\entity\projectile\Arrow;
use pocketmine\entity\projectile\Egg;
use pocketmine\entity\projectile\EnderPearl;
use pocketmine\entity\projectile\ExperienceBottle;
use pocketmine\entity\projectile\Snowball;
use pocketmine\entity\projectile\SplashPotion;
use pocketmine\item\Item;
use pocketmine\math\Facing;
use pocketmine\math\Vector3;
use pocketmine\nbt\NbtException;
use pocketmine\nbt\tag\ByteTag;
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\nbt\tag\IntTag;
use pocketmine\nbt\tag\ShortTag;
use pocketmine\nbt\tag\StringTag;
use pocketmine\utils\SingletonTrait;
use pocketmine\utils\Utils;
use pocketmine\world\World;
use function count;
use function reset;
 
final class EntityFactory{
    use SingletonTrait;
 
    public const TAG_IDENTIFIER = "identifier"; //TAG_String
    public const TAG_LEGACY_ID = "id"; //TAG_Int
 
    private array $creationFuncs = [];
    private array $saveNames = [];
 
    public function __construct(){
        //define legacy save IDs first - use them for saving for maximum compatibility with Minecraft PC
        //TODO: index them by version to allow proper multi-save compatibility
 
        $this->register(Arrow::class, function(World $world, CompoundTag $nbt) : Arrow{
            return new Arrow(Helper::parseLocation($nbt, $world), null, $nbt->getByte(Arrow::TAG_CRIT, 0) === 1, $nbt);
        }, ['Arrow', 'minecraft:arrow']);
 
        $this->register(Egg::class, function(World $world, CompoundTag $nbt) : Egg{
            return new Egg(Helper::parseLocation($nbt, $world), null, $nbt);
        }, ['Egg', 'minecraft:egg']);
 
        $this->register(EndCrystal::class, function(World $world, CompoundTag $nbt) : EndCrystal{
            return new EndCrystal(Helper::parseLocation($nbt, $world), $nbt);
        }, ['EnderCrystal', 'minecraft:ender_crystal']);
 
        $this->register(EnderPearl::class, function(World $world, CompoundTag $nbt) : EnderPearl{
            return new EnderPearl(Helper::parseLocation($nbt, $world), null, $nbt);
        }, ['ThrownEnderpearl', 'minecraft:ender_pearl']);
 
        $this->register(ExperienceBottle::class, function(World $world, CompoundTag $nbt) : ExperienceBottle{
            return new ExperienceBottle(Helper::parseLocation($nbt, $world), null, $nbt);
        }, ['ThrownExpBottle', 'minecraft:xp_bottle']);
 
        $this->register(ExperienceOrb::class, function(World $world, CompoundTag $nbt) : ExperienceOrb{
            $value = 1;
            if(($valuePcTag = $nbt->getTag(ExperienceOrb::TAG_VALUE_PC)) instanceof ShortTag){ //PC
                $value = $valuePcTag->getValue();
            }elseif(($valuePeTag = $nbt->getTag(ExperienceOrb::TAG_VALUE_PE)) instanceof IntTag){ //PE save format
                $value = $valuePeTag->getValue();
            }
 
            return new ExperienceOrb(Helper::parseLocation($nbt, $world), $value, $nbt);
        }, ['XPOrb', 'minecraft:xp_orb']);
 
        $this->register(FallingBlock::class, function(World $world, CompoundTag $nbt) : FallingBlock{
            return new FallingBlock(Helper::parseLocation($nbt, $world), FallingBlock::parseBlockNBT(RuntimeBlockStateRegistry::getInstance(), $nbt), $nbt);
        }, ['FallingSand', 'minecraft:falling_block']);
 
        $this->register(ItemEntity::class, function(World $world, CompoundTag $nbt) : ItemEntity{
            $itemTag = $nbt->getCompoundTag(ItemEntity::TAG_ITEM);
            if($itemTag === null){
                throw new SavedDataLoadingException("Expected \"" . ItemEntity::TAG_ITEM . "\" NBT tag not found");
            }
 
            $item = Item::nbtDeserialize($itemTag);
            if($item->isNull()){
                throw new SavedDataLoadingException("Item is invalid");
            }
            return new ItemEntity(Helper::parseLocation($nbt, $world), $item, $nbt);
        }, ['Item', 'minecraft:item']);
 
        $this->register(Painting::class, function(World $world, CompoundTag $nbt) : Painting{
            $motive = PaintingMotive::getMotiveByName($nbt->getString(Painting::TAG_MOTIVE));
            if($motive === null){
                throw new SavedDataLoadingException("Unknown painting motive");
            }
            $blockIn = new Vector3($nbt->getInt(Painting::TAG_TILE_X), $nbt->getInt(Painting::TAG_TILE_Y), $nbt->getInt(Painting::TAG_TILE_Z));
            if(($directionTag = $nbt->getTag(Painting::TAG_DIRECTION_BE)) instanceof ByteTag){
                $facing = Painting::DATA_TO_FACING[$directionTag->getValue()] ?? Facing::NORTH;
            }elseif(($facingTag = $nbt->getTag(Painting::TAG_FACING_JE)) instanceof ByteTag){
                $facing = Painting::DATA_TO_FACING[$facingTag->getValue()] ?? Facing::NORTH;
            }else{
                throw new SavedDataLoadingException("Missing facing info");
            }
 
            return new Painting(Helper::parseLocation($nbt, $world), $blockIn, $facing, $motive, $nbt);
        }, ['Painting', 'minecraft:painting']);
 
        $this->register(PrimedTNT::class, function(World $world, CompoundTag $nbt) : PrimedTNT{
            return new PrimedTNT(Helper::parseLocation($nbt, $world), $nbt);
        }, ['PrimedTnt', 'PrimedTNT', 'minecraft:tnt']);
 
        $this->register(Snowball::class, function(World $world, CompoundTag $nbt) : Snowball{
            return new Snowball(Helper::parseLocation($nbt, $world), null, $nbt);
        }, ['Snowball', 'minecraft:snowball']);
 
        $this->register(SplashPotion::class, function(World $world, CompoundTag $nbt) : SplashPotion{
            $potionType = PotionTypeIdMap::getInstance()->fromId($nbt->getShort(SplashPotion::TAG_POTION_ID, PotionTypeIds::WATER));
            if($potionType === null){
                throw new SavedDataLoadingException("No such potion type");
            }
            return new SplashPotion(Helper::parseLocation($nbt, $world), null, $potionType, $nbt);
        }, ['ThrownPotion', 'minecraft:potion', 'thrownpotion']);
 
        $this->register(Squid::class, function(World $world, CompoundTag $nbt) : Squid{
            return new Squid(Helper::parseLocation($nbt, $world), $nbt);
        }, ['Squid', 'minecraft:squid']);
 
        $this->register(Villager::class, function(World $world, CompoundTag $nbt) : Villager{
            return new Villager(Helper::parseLocation($nbt, $world), $nbt);
        }, ['Villager', 'minecraft:villager']);
 
        $this->register(Zombie::class, function(World $world, CompoundTag $nbt) : Zombie{
            return new Zombie(Helper::parseLocation($nbt, $world), $nbt);
        }, ['Zombie', 'minecraft:zombie']);
 
        $this->register(Human::class, function(World $world, CompoundTag $nbt) : Human{
            return new Human(Helper::parseLocation($nbt, $world), Human::parseSkinNBT($nbt), $nbt);
        }, ['Human']);
    }
 
    public function register(string $className, \Closure $creationFunc, array $saveNames) : void{
        if(count($saveNames) === 0){
            throw new \InvalidArgumentException("At least one save name must be provided");
        }
        Utils::testValidInstance($className, Entity::class);
        Utils::validateCallableSignature(new CallbackType(
            new ReturnType(Entity::class),
            new ParameterType("world", World::class),
            new ParameterType("nbt", CompoundTag::class)
        ), $creationFunc);
 
        foreach($saveNames as $name){
            $this->creationFuncs[$name] = $creationFunc;
        }
 
        $this->saveNames[$className] = reset($saveNames);
    }
 
    public function createFromData(World $world, CompoundTag $nbt) : ?Entity{
        try{
            $saveId = $nbt->getTag(self::TAG_IDENTIFIER) ?? $nbt->getTag(self::TAG_LEGACY_ID);
            $func = null;
            if($saveId instanceof StringTag){
                $func = $this->creationFuncs[$saveId->getValue()] ?? null;
            }elseif($saveId instanceof IntTag){ //legacy MCPE format
                $stringId = LegacyEntityIdToStringIdMap::getInstance()->legacyToString($saveId->getValue() & 0xff);
                $func = $stringId !== null ? $this->creationFuncs[$stringId] ?? null : null;
            }
            if($func === null){
                return null;
            }
            $entity = $func($world, $nbt);
 
            return $entity;
        }catch(NbtException $e){
            throw new SavedDataLoadingException($e->getMessage(), 0, $e);
        }
    }
 
    public function injectSaveId(string $class, CompoundTag $saveData) : void{
        if(isset($this->saveNames[$class])){
            $saveData->setTag(self::TAG_IDENTIFIER, new StringTag($this->saveNames[$class]));
        }else{
            throw new \InvalidArgumentException("Entity $class is not registered");
        }
    }
 
    public function getSaveId(string $class) : string{
        if(isset($this->saveNames[$class])){
            return $this->saveNames[$class];
        }
        throw new \InvalidArgumentException("Entity $class is not registered");
    }
}