chesspresso.position
Class CompactPosition

java.lang.Object
  |
  +--chesspresso.position.AbstractPosition
        |
        +--chesspresso.position.CompactPosition

All Implemented Interfaces:

ImmutablePosition

public class CompactPosition

extends AbstractPosition

An implementation of the position interface. The class is optimized for memory footprint. Each instance uses only 36 bytes for internal representation (plus some overhead for java internals).

Version:

$Revision: 1.1 $

Author:

Bernhard Seybold

Field Summary

Fields inherited from class chesspresso.position.AbstractPosition

HASH_ALL_MASK, HASH_TOPLAY_MASK, HASH_TOPLAY_MULT, s_hashCastleMod, s_hashEPMod, s_hashMod

Fields inherited from interface chesspresso.position.ImmutablePosition

ALL_CASTLES, BLACK_CASTLE, BLACK_LONG_CASTLE, BLACK_SHORT_CASTLE, NO_CASTLES, WHITE_CASTLE, WHITE_LONG_CASTLE, WHITE_SHORT_CASTLE

Constructor Summary

CompactPosition()

CompactPosition(ImmutablePosition position)

Method Summary

int	getCastles() Return the still allowed castles as mask.
int	getHalfMoveClock() Return the number of moves since the last capture and the last pawn move.
int	getPlyNumber() Return the current ply number.
int	getSqiEP() Return the current en passant square.
int	getStone(int sqi) Return the stone currently on the given square.
int	getToPlay() Return the player whose turn it is.

Methods inherited from class chesspresso.position.AbstractPosition

equals, getFEN, getHashCode, getStartPositionHashCode, hashCode, isCastlePossible, isLegal, isSquarePossibleEPSquare, isStartPosition, isWhiteToPlay, toString, validate

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

CompactPosition

public CompactPosition()

CompactPosition

public CompactPosition(ImmutablePosition position)

Method Detail

getStone

public int getStone(int sqi)

Description copied from interface: ImmutablePosition

Return the stone currently on the given square.

Parameters:

sqi - the square

Returns:

the stone of the given square

getSqiEP

public int getSqiEP()

Description copied from interface: ImmutablePosition

Return the current en passant square.

Returns:

the current en passant square, NO_SQUARE if none

getCastles

public int getCastles()

Description copied from interface: ImmutablePosition

Return the still allowed castles as mask.

Returns:

the still allowed castles as mask.

getToPlay

public int getToPlay()

Description copied from interface: ImmutablePosition

Return the player whose turn it is.

Returns:

the player whose turn it is

getPlyNumber

public int getPlyNumber()

Description copied from interface: ImmutablePosition

Return the current ply number.

Returns:

the current ply number, starting at play no. 0

getHalfMoveClock

public int getHalfMoveClock()

Description copied from interface: ImmutablePosition

Return the number of moves since the last capture and the last pawn move. This number is used for the 50-move rule.

Returns:

the number of moves since the last capture and the last pawn move