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24 * Portions Copyrighted 2010 Martin Rexa
27 package cz.xelfi.quoridor.statistics;
30 import java.util.HashMap;
31 import java.util.List;
32 import java.util.Collections;
33 import java.util.ArrayList;
34 import javax.xml.bind.annotation.XmlElement;
35 import javax.xml.bind.annotation.XmlAttribute;
36 import javax.xml.bind.annotation.XmlElementWrapper;
37 import javax.xml.bind.annotation.XmlRootElement;
38 import javax.xml.bind.annotation.XmlAccessType;
39 import javax.xml.bind.annotation.XmlAccessorType;
45 @XmlAccessorType(XmlAccessType.FIELD)
46 public class EloList {
47 static int INITIAL_ELO = 1250;
48 static int MAX_ELO_DIFF = 400;
49 static int KVAL_START = 25;
50 static int KVAL_FOLLOW = 10;
51 static int KVAL_LIMIT = 30;
53 Map<String, Double> players;
54 Map<String, Integer> playerGames;
61 players = new HashMap<String, Double>();
62 playerGames = new HashMap<String, Integer>();
66 public EloList(EloList src){
67 this.players = new HashMap<String, Double>(src.players);
68 this.playerGames = new HashMap<String, Integer>(src.playerGames);
72 @XmlElementWrapper(name="elolist")
73 @XmlElement(name="item")
74 public List<EloEntry> getFinalList(){
75 List<EloEntry> finalList = new ArrayList<EloEntry>();
76 for (Map.Entry<String, Double> player : players.entrySet()){
77 finalList.add(new EloEntry(player.getKey(), player.getValue(), playerGames.get(player.getKey())));
79 Collections.sort(finalList, EloEntry.BEST_FIRST);
83 public EloList putResult(String winner, String looser){
84 return putResult(winner, looser, System.currentTimeMillis());
87 public EloList putResult(String winner, String looser, long modified){
88 this.lastGame = modified;
89 if(this.firstGame == 0)
90 this.firstGame = modified;
91 double wElo = getElo(winner);
92 double lElo = getElo(looser);
94 double eloDiff = wElo - lElo;
95 if(eloDiff < - MAX_ELO_DIFF)
96 eloDiff = - MAX_ELO_DIFF;
97 if(eloDiff > MAX_ELO_DIFF)
98 eloDiff = MAX_ELO_DIFF;
100 double wDiff = Math.round(100 * getKVal(winner) * (1 - (1 / (1 + Math.pow(10, -eloDiff / MAX_ELO_DIFF)))));
102 double lDiff = Math.round(100 * getKVal(looser) * (0 - (1 / (1 + Math.pow(10, eloDiff / MAX_ELO_DIFF)))));
105 players.put(winner, wElo + wDiff);
106 players.put(looser, lElo + lDiff);
110 public double getElo(String player){
111 Double elo = players.get(player);
112 return (elo == null) ? INITIAL_ELO : elo;
115 private int getKVal(String player){
116 Integer games = playerGames.get(player);
117 int g = (games == null) ? 0 : games;
118 // Side effect, method should not be called more times for the same game/player
119 playerGames.put(player, g + 1);
120 return g < KVAL_LIMIT ? KVAL_START : KVAL_FOLLOW;