NameFetcher.java

package me.ikeetjeop.staffonlineultimate.utils;

import com.avaje.ebean.text.json.JsonElementArray;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import org.bukkit.Bukkit;
import org.json.simple.JSONArray;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

import java.io.IOException;
import java.lang.reflect.Type;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.*;
/**
 * Created by @Ikeetjeop aka Nick on 10-May-18.
 */
public class NameFetcher {
    private static Map<UUID, String> cache = new HashMap<>();

    public static String getNameOf(UUID uuid) {
        if (cache.containsKey(uuid)) {
            return cache.get(uuid);
        }
        URL url;
        HttpURLConnection connection;
        try {
            url = new URL("https://mc-heads.net/minecraft/profile/" + uuid.toString().replace("-", "").toLowerCase());
            connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            if(connection.getResponseCode() == 429){
                return null;
            }
            String text = new Scanner(connection.getInputStream()).useDelimiter("\\Z").next();
            JsonObject jobj = new Gson().fromJson(text, JsonObject.class);
            cache.put(uuid, jobj.get("name").getAsString());
            return jobj.get("name").getAsString();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void invalidateCache() {
        cache.clear();
    }

    public static Map<UUID, String> getCache() {
        return cache;
    }
}