DynamicValue.php

<?php
 
/*
 * This file is part of BedrockProtocol.
 * Copyright (C) 2014-2022 PocketMine Team <https://github.com/pmmp/BedrockProtocol>
 *
 * BedrockProtocol 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.
 */
 
declare(strict_types=1);
 
namespace pocketmine\network\mcpe\protocol\types\cereal;
 
use pmmp\encoding\ByteBufferReader;
use pmmp\encoding\ByteBufferWriter;
use pocketmine\network\mcpe\protocol\PacketDecodeException;
 
abstract class DynamicValue{
    abstract public function getTypeId() : int;
 
    abstract protected function writeValue(ByteBufferWriter $out) : void;
 
    final public function write(ByteBufferWriter $out) : void{
        $this->writeValue($out);
    }
 
    final public static function read(ByteBufferReader $in, int $type) : ?self{
        //TODO: I don't like putting this here (cyclic dependency) but I don't know where else to put it for now.
        //Really we need to revamp how unions are handled in general, but that's a job for another time
        return match($type){
            DynamicValueType::NULL => null,
            DynamicValueBool::ID => DynamicValueBool::readValue($in),
            DynamicValueLong::ID => DynamicValueLong::readValue($in),
            DynamicValueDouble::ID => DynamicValueDouble::readValue($in),
            DynamicValueString::ID => DynamicValueString::readValue($in),
            DynamicValueList::ID => DynamicValueList::readValue($in),
            DynamicValueMap::ID => DynamicValueMap::readValue($in),
            default => throw new PacketDecodeException("Unknown dynamic value type $type")
        };
    }
}