PlayerData.java

// PlayerData.java
// Copyright (c) 2012 Andrew Downing
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import java.io.*;

/** information about each player that is saved to file between sessions */
public class PlayerData implements Serializable {
  private String name; /**< name of this player */
  private String password; /**< password to sign in to this player's account */
  private int gamesWon; /**< number of games this player won (doesn't include ties) */
  private int gamesPlayed; /**< total number of games this player finished playing
                                (includes ties but doesn't include incomplete games) */

  /** constructor for persistent player data */
  public PlayerData(String newName, String newPassword, int newGamesWon, int newGamesPlayed) {
    if (!isValidName(newName)) {
      throw new IllegalArgumentException("Player name is not a valid name");
    }
    if (newGamesWon < 0 || newGamesPlayed < 0) {
      throw new IllegalArgumentException("Games won and played must both be nonnegative");
    }
    name = newName;
    setPassword(newPassword);
    gamesWon = newGamesWon;
    gamesPlayed = newGamesPlayed;
  }

  /** called when this player won a game */
  public void winGame() {
    gamesWon++;
    gamesPlayed++;
  }

  /** called when this player lost or the game was a tie */
  public void loseGame() {
    gamesPlayed++;
  }

  /** setter for password */
  public void setPassword(String newPassword) {
    if (newPassword.isEmpty()) {
      throw new IllegalArgumentException("Password may not be empty");
    }
    password = newPassword;
  }

  /** returns whether specified credentials match with this player account */
  public final boolean signInMatch(String checkName, String checkPassword) {
    return name.equals(checkName) && password.equals(checkPassword);
  }

  /** getter for player name */
  public final String getName() {
    return name;
  }

  /** getter for games won */
  public final int getGamesWon() {
    return gamesWon;
  }

  /** getter for games played */
  public final int getGamesPlayed() {
    return gamesPlayed;
  }

  /** returns whether specified player name is valid
      (i.e. is not empty and is composed only of letters, numbers, or spaces) */
  public static boolean isValidName(String name) {
    if (name.isEmpty()) {
      return false;
    }
    for (char ch : name.toCharArray()) {
      if (!Character.isLetterOrDigit(ch) && !Character.isWhitespace(ch)) {
        return false;
      }
    }
    return true;
  }
}