Pvp Assist System

package com.synergy;

import org.l2jmobius.commons.util.Rnd;
import org.l2jmobius.gameserver.enums.ClassId;
import org.l2jmobius.gameserver.model.Party;
import org.l2jmobius.gameserver.model.actor.Player;
import org.l2jmobius.gameserver.network.serverpackets.ExShowScreenMessage;

import java.util.HashMap;
import java.util.List;

// credits @Excellence
public class Synergy {

    public static final HashMap<Integer, synergyClass> _classes = new HashMap<>();

    public void handle(Player dead, Player alive)
    {
        Party party = alive.getParty();
        if (party != null)
        {
            if (alive.isInCombat())
            {
                List<Player> partyMembers = party.getMembers();
                for (int i = 0; i < partyMembers.size(); i++)
                {
                    Player singleMember = partyMembers.get(i);
                    synergyClass synergyClass = _classes.get(singleMember.getClassId().getId());
                    if (synergyClass == null || singleMember == alive || !singleMember.isInsideRadius3D(dead, 1500))
                        continue;

                    boolean award = Rnd.get(100) < synergyClass._chance;
                    if (award)
                    {
                        singleMember.sendPacket(new ExShowScreenMessage("You gained a PvP assist!   Killer: [" + alive.getName() + "]   Killed: [" + dead.getName() +"]", ExShowScreenMessage.TOP_CENTER, 5000, 1, true, false));
                        singleMember.addExpAndSp(synergyClass._exp, 1); //value next to _exp is Sp
                        singleMember.setPvpKills(singleMember.getPvpKills() +1);

                        //singleMember._spreeKills++;
                       //SpreeSystem.getInstance().sp(singleMember, singleMember._spreeKills);
					  // since you dont use these though you can add anything you like for the assister to count

                    }
                }
            }
        }
    }

    public static final class synergyClass
    {
        final int _chance;
        final long _exp;

        public synergyClass(int chance, int exp)
        {
            _chance = chance;
            _exp = exp;
        }
    }

    static
    {
        /** Healers (add classes here)*/
        _classes.put(ClassId.CARDINAL.getId(), new synergyClass(38, 100000)); //38 value is the chance the next to it is the exp reward
        _classes.put(ClassId.EVA_SAINT.getId(), new synergyClass(38, 100000));
        _classes.put(ClassId.SHILLIEN_SAINT.getId(), new synergyClass(38, 100000));
			// you can add class you need in here
        /** Tanks (add classes here)*/
        _classes.put(ClassId.HELL_KNIGHT.getId(), new synergyClass(22, 100000));
        _classes.put(ClassId.PHOENIX_KNIGHT.getId(), new synergyClass(22, 100000));
        _classes.put(ClassId.SHILLIEN_TEMPLAR.getId(), new synergyClass(22, 100000));
		/** Supports */
		_classes.put(ClassId.DOMINATOR.getId(), new synergyClass(18, 100000));
		_classes.put(ClassId.DOOMCRYER.getId(), new synergyClass(18, 100000));
    }

    public static Synergy getInstance()
    {
        return SingletonHolder.INSTANCE;
    }

    private static class SingletonHolder
    {
        protected static final Synergy INSTANCE = new Synergy();
    }
}