Utils/BukkitUtils/src/main/java/eu/mikroskeem/utils/bukkit/PlayerUtils.java

package eu.mikroskeem.utils.bukkit;

import eu.mikroskeem.shuriken.reflect.Reflect;
import eu.mikroskeem.shuriken.reflect.wrappers.ClassWrapper;
import org.bukkit.entity.Player;
import org.jetbrains.annotations.NotNull;

import java.lang.reflect.InvocationTargetException;

import static com.google.common.base.Preconditions.checkNotNull;
import static eu.mikroskeem.utils.bukkit.ServerUtils.getNmsVersion;

public class PlayerUtils {
    /**
     * Return player ping (via NMS reflection)
     *
     * Note: I'm bit disappointed, that Bukkit API doesn't expose method to get player's ping
     *
     * @param player Player who ping to query
     * @return Player's ping (-1 if reflection failed)
     */
    @SuppressWarnings("unchecked")
    public static <CraftPlayer, NMSPlayer> int getNMSPing(@NotNull Player player){
        try {
            String nmsVer = getNmsVersion();
            ClassWrapper<CraftPlayer> craftPlayerClass = (ClassWrapper<CraftPlayer>) checkNotNull(Reflect.getClass(
                    String.format("org.bukkit.craftbukkit.%s.entity.CraftPlayer", nmsVer)).orElse(null))
                    .setClassInstance(player);
            ClassWrapper<NMSPlayer> nmsEntityPlayerClass = (ClassWrapper<NMSPlayer>) checkNotNull(Reflect.getClass(
                    String.format("net.minecraft.server.%s.EntityPlayer", nmsVer)).orElse(null));
            NMSPlayer nmsPlayer = craftPlayerClass
                    .invokeMethod("getHandle", nmsEntityPlayerClass.getWrappedClass());
            nmsEntityPlayerClass.setClassInstance(nmsPlayer);
            return checkNotNull(nmsEntityPlayerClass.getField("ping", int.class).orElse(null)).read();
        }
        catch (NullPointerException|NoSuchFieldException|NoSuchMethodException|
                IllegalAccessException|InvocationTargetException ignored){}
        return -1;
    }
}