source: java/ecj/cecj/app/othello/OthelloBoard.java @ 28

package cecj.app.othello;

import java.util.Arrays;
import games.Board;
import games.Player;

public class OthelloBoard implements Board {
        private static final int BOARD_SIZE = 8;
        private static final int BOARD_MARGIN = 2;
        
        private static final int EMPTY = -1;
        
        public static final int BLACK = 0;
        public static final int WHITE = 1;
        
        public static final int NUM_DIRECTIONS = 8;
        public static final int ROW_DIR[] = { -1, -1, -1, 0, 0, 1, 1, 1 };
        public static final int COL_DIR[] = { -1, 0, 1, -1, 1, -1, 0, 1 };

        private int board[][];

        public OthelloBoard() {
                board = new int[BOARD_SIZE + BOARD_MARGIN][BOARD_SIZE + BOARD_MARGIN];
                reset();
        }

        private void initBoard() {
                setPiece(4, 4, WHITE);
                setPiece(4, 5, BLACK);
                setPiece(5, 4, BLACK);
                setPiece(5, 5, WHITE);
        }

        public int countPieces(int player) {
                int count = 0;
                for (int row = 1; row <= BOARD_SIZE; row++) {
                        for (int col = 1; col <= BOARD_SIZE; col++) {
                                if (getPiece(row, col) == player) {
                                        count++;
                                }
                        }
                }
                return count;
        }

        public static int size() {
                return BOARD_SIZE;
        }

        public int getPiece(int row, int col) {
                return board[row][col];
        }

        public void setPiece(int row, int col, int player) {
                board[row][col] = player;
        }

        public boolean isEmpty(int row, int col) {
                return (getPiece(row, col) == EMPTY);
        }

        public int getPiece(int row, int col, int dir, int dist) {
                return getPiece(row + dist * ROW_DIR[dir], col + dist * COL_DIR[dir]);
        }

        public void setPiece(int row, int col, int dir, int dist, int player) {
                setPiece(row + dist * ROW_DIR[dir], col + dist * COL_DIR[dir], player);
        }
        
        public OthelloMove getShiftedMove(int row, int col, int dir, int dist) {
                return new OthelloMove(row + dist * ROW_DIR[dir], col + dist * COL_DIR[dir]);
        }
        
        @Override
        public String toString() {
                StringBuilder builder = new StringBuilder();
                builder.append("    ");
                for (int i = 1; i <= BOARD_SIZE; i++) {
                        builder.append(i + " ");
                }
                builder.append("\n");
                
                for (int i = 0; i < BOARD_SIZE + BOARD_MARGIN; i++) {
                        if (i > 0 && i <= BOARD_SIZE) {
                                builder.append(i + " ");
                        } else {
                                builder.append("  ");                           
                        }
                        for (int j = 0; j < BOARD_SIZE + BOARD_MARGIN; j++) {
                                builder.append(((board[i][j] == -1) ? "-" : board[i][j]) + " ");
                        }
                        builder.append("\n");
                }
                return builder.toString();
        }

        public void reset() {
                for (int row = 0; row < board.length; row++) {
                        Arrays.fill(board[row], EMPTY);
                }

                initBoard();            
        }
        
        public OthelloBoard clone() {
                OthelloBoard clone = new OthelloBoard();
                for (int row = 1; row <= BOARD_SIZE; row++) {
                        for (int col = 1; col <= BOARD_SIZE; col++) {
                                clone.board[row][col] = board[row][col];
                        }
                }
                return clone;
        }
        
        public double evaluate(Player player) {
                double result = 0;
                for (int row = 1; row <= BOARD_SIZE; row++) {
                        for (int col = 1; col <= BOARD_SIZE; col++) {
                                result += getValueAt(row, col) * player.getValue(row, col);
                        }
                }
                return result;
        }
        
        public int getValueAt(int row, int col) {
                if (board[row][col] == OthelloBoard.BLACK) {
                        return 1;
                } else if (board[row][col] == OthelloBoard.WHITE) {
                        return -1;
                } else {
                        return 0;
                }
        }
}