com.editev.chess
Class GameState

java.lang.Object
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  +--com.editev.chess.Chess
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        +--com.editev.chess.Board
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              +--com.editev.chess.GameState

Direct Known Subclasses:

Game

public class GameState

extends Board

Represents the State of a game of chess, including the Board position, and castling status, e.p. moves, 50 move rule, etc.

See Also:

the source here.

Inner classes inherited from class com.editev.chess.Chess

Chess.Black, Chess.White

Field Summary

(package private) byte	epColumn Which row the previous (2-square, pawn) move was in, for a possible e.p., or NO_EP_COLUMN if none.
(package private) boolean[]	kingMoved Have the { White, Black } kings moved yet?
(package private) int	moves Moves since the start of the game.
static byte	NO_EP_COLUMN This constant represents the very common case where the last move didn't introduce the possibility of an en passant capture in the next move.
(package private) int	reversibleMoves Moves since the last irreversible move.
(package private) boolean[][]	rookMoved Have the { {WK, WQ}, {BK, BQ} } rooks moved yet?

Fields inherited from class com.editev.chess.Board

PIECE_NAMES, PIECES, squares

Fields inherited from class com.editev.chess.Chess

BLACK, NO_MOVE, NO_PIECE, WHITE

Constructor Summary

GameState()

Method Summary

boolean	canBeCaptured(byte piece) Can this piece be captured by the player on the move? \
boolean	canMove(byte piece) Does this piece belong to the player on-the-move?
void	clearEP() Clear the enpassant column, the last move wasn't a pawn or wasn't two squares.
byte	getEP()
int	getMoves() Moves since start of game.
int	getReversibleMoves() Get the number of moves since an irreversible move has occurred (50 move rule).
void	incrementMoves() Moves since start of game.
void	irreversibleMove() An irreversible move has occurred, which must be a capture or a pawn move (50 move rule).
boolean	isWhiteMove() Is white on the move?
boolean	kingMoved(byte king) Has a king been moved?
void	moveKing(byte king) Marks a king as having been moved.
void	moveRook(byte rook, boolean kSide) Mark a rook as having been moved.
boolean	rookMoved(byte rook, boolean kSide) Has a rook been moved?
void	setEP(byte column) Set the e.p.

Methods inherited from class com.editev.chess.Board

clone, cloneBoard, copyFrom, equals, findPieceSquare, getPiece, getPiece, getPieceIndex, getPieceIndex, hasPiece, inCheck, isAttacked, resultsInCheck, setPieceIndex, toString

Methods inherited from class com.editev.chess.Chess

notColor, toColor, toColor, toColorName

Methods inherited from class java.lang.Object

, finalize, getClass, hashCode, notify, notifyAll, registerNatives, wait, wait, wait

Field Detail

kingMoved

boolean[] kingMoved

Have the { White, Black } kings moved yet?

rookMoved

boolean[][] rookMoved

Have the { {WK, WQ}, {BK, BQ} } rooks moved yet?

reversibleMoves

int reversibleMoves

Moves since the last irreversible move.

moves

int moves

Moves since the start of the game.

NO_EP_COLUMN

public static final byte NO_EP_COLUMN

This constant represents the very common case where the last move didn't introduce the possibility of an en passant capture in the next move.

epColumn

byte epColumn

Which row the previous (2-square, pawn) move was in, for a possible e.p., or NO_EP_COLUMN if none.

Constructor Detail

GameState

public GameState()

Method Detail

getMoves

public int getMoves()

Moves since start of game.

Returns:

the number of moves since the start of the game

incrementMoves

public void incrementMoves()

Moves since start of game.

Returns:

the number of moves since the start of the game

isWhiteMove

public boolean isWhiteMove()

Is white on the move?

Returns:

true if White is on the move.

canMove

public boolean canMove(byte piece)

Does this piece belong to the player on-the-move?

Returns:

true if this is a piece on the move.

canBeCaptured

public boolean canBeCaptured(byte piece)

Can this piece be captured by the player on the move? \

Returns:

true if this is a piece that can be captured.

kingMoved

public boolean kingMoved(byte king)

Has a king been moved?

Parameters:

color - a piece to indicate the color.

Returns:

true if the king has been moved.

moveKing

public void moveKing(byte king)

Marks a king as having been moved.

Parameters:

color - a piece to indicate the color.

rookMoved

public boolean rookMoved(byte rook,
                         boolean kSide)

Has a rook been moved?

Parameters:

color - a piece to indicate the color.

isKingSide - true if we are looking at the kingside rook

Returns:

true if the rook has been moved.

moveRook

public void moveRook(byte rook,
                     boolean kSide)

Mark a rook as having been moved.

Parameters:

color - a piece to indicate the color.

isKingSide - true if we are looking at the kingside rook

irreversibleMove

public void irreversibleMove()

An irreversible move has occurred, which must be a capture or a pawn move (50 move rule).

getReversibleMoves

public int getReversibleMoves()

Get the number of moves since an irreversible move has occurred (50 move rule).

setEP

public void setEP(byte column)

Set the e.p. column indicating that the last pawn move was two squares (first move).

clearEP

public void clearEP()

Clear the enpassant column, the last move wasn't a pawn or wasn't two squares.

getEP

public byte getEP()

Returns:

e.p. column if there's a potential e.p. capture this turn.