如何在Spigot / Bukkit插件中将门户重定向到正确的世界？

I'm working on a Spigot world management plugin (a rewrite of a current one of mine) and I need to redirect nether and end portals to the correct world. I'm all done with every part of the plugin besides this one. Here are a couple examples of what I need.I'm working on a Spigot world management plugin