Removed pocketmine subdirectory, map PSR-4 style

src/world/generator/GeneratorManager.php

@@ -0,0 +1,115 @@
+<?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\world\generator;
+
+use pocketmine\utils\Utils;
+use pocketmine\world\generator\hell\Nether;
+use pocketmine\world\generator\normal\Normal;
+use function array_keys;
+use function strtolower;
+
+final class GeneratorManager{
+	/** @var string[] name => classname mapping */
+	private static $list = [];
+
+	/**
+	 * Registers the default known generators.
+	 */
+	public static function registerDefaultGenerators() : void{
+		self::addGenerator(Flat::class, "flat");
+		self::addGenerator(Normal::class, "normal");
+		self::addGenerator(Normal::class, "default");
+		self::addGenerator(Nether::class, "hell");
+		self::addGenerator(Nether::class, "nether");
+	}
+
+	/**
+	 * @param string $class Fully qualified name of class that extends \pocketmine\world\generator\Generator
+	 * @param string $name Alias for this generator type that can be written in configs
+	 * @param bool   $overwrite Whether to force overwriting any existing registered generator with the same name
+	 *
+	 * @throws \InvalidArgumentException
+	 */
+	public static function addGenerator(string $class, string $name, bool $overwrite = false) : void{
+		Utils::testValidInstance($class, Generator::class);
+
+		if(!$overwrite and isset(self::$list[$name = strtolower($name)])){
+			throw new \InvalidArgumentException("Alias \"$name\" is already assigned");
+		}
+
+		self::$list[$name] = $class;
+	}
+
+	/**
+	 * Returns a list of names for registered generators.
+	 *
+	 * @return string[]
+	 */
+	public static function getGeneratorList() : array{
+		return array_keys(self::$list);
+	}
+
+	/**
+	 * Returns a class name of a registered Generator matching the given name.
+	 *
+	 * @param string $name
+	 * @param bool   $throwOnMissing @deprecated this is for backwards compatibility only
+	 *
+	 * @return string|Generator Name of class that extends Generator (not an actual Generator object)
+	 * @throws \InvalidArgumentException if the generator type isn't registered
+	 */
+	public static function getGenerator(string $name, bool $throwOnMissing = false){
+		if(isset(self::$list[$name = strtolower($name)])){
+			return self::$list[$name];
+		}
+
+		if($throwOnMissing){
+			throw new \InvalidArgumentException("Alias \"$name\" does not map to any known generator");
+		}
+		return Normal::class;
+	}
+
+	/**
+	 * Returns the registered name of the given Generator class.
+	 *
+	 * @param string $class Fully qualified name of class that extends \pocketmine\world\generator\Generator
+	 *
+	 * @return string
+	 * @throws \InvalidArgumentException if the class type cannot be matched to a known alias
+	 */
+	public static function getGeneratorName(string $class) : string{
+		Utils::testValidInstance($class, Generator::class);
+		foreach(self::$list as $name => $c){
+			if($c === $class){
+				return $name;
+			}
+		}
+
+		throw new \InvalidArgumentException("Generator class $class is not registered");
+	}
+
+	private function __construct(){
+		//NOOP
+	}
+}