edu.lhup.ai.tictactoe
Class Evaluator

java.lang.Object
  |
  +--edu.lhup.ai.tictactoe.Evaluator

All Implemented Interfaces:

IEvaluator

public class Evaluator

extends Object

implements IEvaluator

An evaluator that is capable of evaluating a tic-tac-toe game. This is done by evaluating terminal and non-terminal states. For example, this evaluator will return 0 if the current state is a tie, 1 if the current state is a victory, and -1 if the current state is a defeat. If the current state is not an end state, the board is analyzed to see if anyone is about to win. If the "maxPlayer" is about to win, 1 is returned, if the "maxPlayer" is about to loose, -1 is returned. If no player is about to win, 0 is returned. This evaluator works well even when a cutoff is specified because it can evaluate non-terminal states.

This software is for educational purposes only.

Author:

Mark Cohen

Constructor Summary

Evaluator()

Method Summary

int	evaluate(IBoard board, IPlayer maxPlayer) Provides a mechanism for evaluating the current state of a game.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Evaluator

public Evaluator()

Method Detail

evaluate

public int evaluate(IBoard board,
                    IPlayer maxPlayer)

Provides a mechanism for evaluating the current state of a game.

Specified by:

evaluate in interface IEvaluator

Parameters:

board - the game that will be evaluated.

maxPlayer - the player whos perspective will be used when evaluating the specified game.

Returns:

0 if the current state is a tie, 1 if the current state is a victory, and -1 if the current state is a defeat. If the current state is not an end state, the board is analyzed to see if anyone is about to win. If the "maxPlayer" is about to win, 1 is returned, if the "minPlayer" is about to win, -1 is returned. If no player is about to win, 0 is returned.

toString

public String toString()

Overrides:

toString in class Object