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/*
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* Quoridor server and related libraries
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* Copyright (C) 2009-2010 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. Look for COPYING file in the top folder.
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* If not, see http://www.gnu.org/licenses/.
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*/
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package cz.xelfi.quoridor.statistics;
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import java.util.Map;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Collections;
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import java.util.ArrayList;
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import javax.xml.bind.annotation.XmlElement;
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import javax.xml.bind.annotation.XmlAttribute;
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import javax.xml.bind.annotation.XmlElementWrapper;
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import javax.xml.bind.annotation.XmlRootElement;
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import javax.xml.bind.annotation.XmlAccessType;
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import javax.xml.bind.annotation.XmlAccessorType;
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/**
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*
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* @author Martin Rexa
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*/
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@XmlRootElement
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@XmlAccessorType(XmlAccessType.FIELD)
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public class EloList {
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static int INITIAL_ELO = 1250;
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static int MAX_ELO_DIFF = 400;
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static int KVAL_START = 25;
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static int KVAL_FOLLOW = 10;
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static int KVAL_LIMIT = 30;
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Map<String, Double> players;
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Map<String, Integer> playerGames;
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long published = 0;
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boolean originalList;
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public EloList () {
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players = new HashMap<String, Double>();
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playerGames = new HashMap<String, Integer>();
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originalList = true;
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}
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public EloList(EloList src){
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this.players = new HashMap<String, Double>(src.players);
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this.playerGames = new HashMap<String, Integer>(src.playerGames);
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originalList = false;
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}
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public void setEndDate(long endDate){
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this.published = endDate;
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}
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public long getEndDate(){
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return this.published;
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}
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@XmlElementWrapper(name="elolist")
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@XmlElement(name="item")
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public List<EloEntry> getFinalList(){
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List<EloEntry> finalList = new ArrayList<EloEntry>();
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for (Map.Entry<String, Double> player : players.entrySet()){
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finalList.add(new EloEntry(player.getKey(), player.getValue(), playerGames.get(player.getKey())));
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}
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Collections.sort(finalList, EloEntry.BEST_FIRST);
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return finalList;
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}
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public EloList putResult(String winner, String looser){
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double wElo = getElo(winner);
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double lElo = getElo(looser);
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double eloDiff = wElo - lElo;
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if(eloDiff < - MAX_ELO_DIFF)
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eloDiff = - MAX_ELO_DIFF;
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if(eloDiff > MAX_ELO_DIFF)
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eloDiff = MAX_ELO_DIFF;
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double wDiff = Math.round(100 * getKVal(winner) * (1 - (1 / (1 + Math.pow(10, -eloDiff / MAX_ELO_DIFF)))));
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wDiff /= 100.0;
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double lDiff = Math.round(100 * getKVal(looser) * (0 - (1 / (1 + Math.pow(10, eloDiff / MAX_ELO_DIFF)))));
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lDiff /= 100.0;
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players.put(winner, wElo + wDiff);
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players.put(looser, lElo + lDiff);
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return this;
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}
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public double getElo(String player){
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Double elo = players.get(player);
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return (elo == null) ? INITIAL_ELO : elo;
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}
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private int getKVal(String player){
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Integer games = playerGames.get(player);
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int g = (games == null) ? 0 : games;
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// Side effect, method should not be called more times for the same game/player
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playerGames.put(player, g + 1);
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return g < KVAL_LIMIT ? KVAL_START : KVAL_FOLLOW;
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}
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}
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