Pieces can be added and removed to bitboards.

I need to implement move function and it will be ok for a very basic suicide chess program
without any move checking.

src/suicideChess/BitBoard.java

@@ -25,24 +25,7 @@ public class BitBoard {
 	public static final int NB_OF_RANKS = 8;
 	public static final int NB_OF_FILES = 8;
 	public static final int NB_OF_SQUARES = NB_OF_RANKS*NB_OF_FILES; 
-	
-	//Some constants used to access the bitboards
-	//Note that in suicide chess there may be more than one king
-	public static final int WHITE_PAWNS = 0;
-	public static final int BLACK_PAWNS = 1;
-	public static final int WHITE_KINGS = 2;
-	public static final int BLACK_KINGS = 3;
-	public static final int WHITE_QUEENS = 4;
-	public static final int BLACK_QUEENS = 5;
-	public static final int WHITE_BISHOPS = 6;
-	public static final int BLACK_BISHOPS = 7;
-	public static final int WHITE_KNIGHTS = 8;
-	public static final int BLACK_KNIGHTS = 9;
-	public static final int WHITE_ROOKS = 10;
-	public static final int BLACK_ROOKS = 11;
-	public static final int WHITE_PIECES = 12;
-	public static final int BLACK_PIECES = 13;
-	
+		
 	public static final int NB_OF_BITBOARDS = 14;
 	
 		
@@ -51,7 +34,7 @@ public class BitBoard {
 	 ********/
 	
 	//The following table is used to map squares to bits
-	private static long mapSquaresToBits[];
+	protected static long mapSquaresToBits[];
 	
 	//static function used to initialise data
 	static {
@@ -62,7 +45,7 @@ public class BitBoard {
 	}
 	
 	//The following table contains all the bit boards
-	private long bitBoards[];
+	protected long bitBoards[];
 	
 	/***************
 	 * CONSTRUCTOR *
@@ -70,6 +53,7 @@ public class BitBoard {
 	
 	public BitBoard() {
 		bitBoards = new long[NB_OF_BITBOARDS];
+		
 	}
 	
 	
@@ -77,18 +61,40 @@ public class BitBoard {
 	 * METHODS *
 	 ***********/
 	
-	public long getBitboard(int bitboard_number) {
+	public long getBitBoard(int bitboard_number) {
 		return bitBoards[bitboard_number];
 	}
 		
 	 
-	public void updateBitboards(String move) {
+	public void updateBitBoards(String move) {
 
 	}
 
 	
-	public int squareToBitboardSquare(Square square) {
+	private int squareToBitBoardSquare(Square square) {
 		//converts a square ("e2") to a BitboardSquare (
 		return square.getFileNb() -1 + (square.getRank()-1)*NB_OF_FILES; 
 	}
+	
+	protected void addPiece(Square square, Piece piece) {
+		//OR :
+		// 0 OR a = a
+		// 1 OR a = 1
+		
+		//add Piece to corresponding bitboard.
+		bitBoards[piece.getPieceNumber()] |= mapSquaresToBits[squareToBitBoardSquare(square)];
+		//update the bitboard of all pieces of that color
+		bitBoards[piece.getColor()] |= mapSquaresToBits[squareToBitBoardSquare(square)];
+	}
+	
+	protected void removePiece(Square square, Piece piece) {
+		//XOR :
+		// 0 XOR a = a
+		// 1 XOR 0 = 1 !!! Don't remove a piece that don't exist !!!
+		// 1 XOR 1 = 0
+		//remove Piece to corresponding bitboard.
+		bitBoards[piece.getPieceNumber()] ^= mapSquaresToBits[squareToBitBoardSquare(square)];
+		//update the bitboard of all pieces of that color
+		bitBoards[piece.getColor()] ^= mapSquaresToBits[squareToBitBoardSquare(square)];;
+	}
 }

src/suicideChess/Piece.java

@@ -0,0 +1,78 @@
+/**
+ * 
+ */
+package suicideChess;
+
+/**
+ * @author djib
+ * 
+ * This file contains the moves representation.
+ * 
+ * $LastChangedDate$
+ * $LastChangedRevision$
+ * $LastChangedBy$
+ */
+
+public class Piece {
+	/*************
+	 * CONSTANTS *
+	 *************/
+	
+	
+	/**
+	 * Take really good care if you want to change those values
+	 * Class BitBoard makes intensive use of those
+	 */
+	//Contants used to detect color
+	public static final int WHITE=0;
+	public static final int BLACK=1;
+	//Constants used in the board representation
+	public static final int WHITE_PIECE = WHITE;
+	public static final int BLACK_PIECE = BLACK;
+	public static final int WHITE_PAWN = 2;
+	public static final int BLACK_PAWN = 3;
+	public static final int WHITE_KING = 4;
+	public static final int BLACK_KING = 5;
+	public static final int WHITE_QUEEN = 6;
+	public static final int BLACK_QUEEN = 7;
+	public static final int WHITE_BISHOP = 8;
+	public static final int BLACK_BISHOP = 9;
+	public static final int WHITE_KNIGHT = 10;
+	public static final int BLACK_KNIGHT = 11;
+	public static final int WHITE_ROOK = 12;
+	public static final int BLACK_ROOK = 13;
+
+	
+	//Constants used for promotion (as used in the xboard protocol)
+	public static final char KING_CHAR='k';
+	public static final char QUEEN_CHAR='q';
+	public static final char BISHOP_CHAR='b';
+	public static final char KNIGHT_CHAR='n';
+	public static final char ROOK_CHAR='r';
+	
+	/****************
+	 * PRIVATE DATA *
+	 ****************/
+	
+	private static int pieceNumber;
+	
+	/***************
+	 * CONSTRUCTOR *
+	 ***************/
+	
+	public Piece(int piece) {
+		pieceNumber = piece;
+	}
+	
+	/***********
+	 * METHODS *
+	 ***********/
+	
+	public int getColor() {
+		return pieceNumber%2; //cf declaration of BLACK and WHITE above and the pieces above.
+	}
+	
+	public int getPieceNumber() {
+		return pieceNumber;
+	}
+}