tims/src/main/java/de/tims/tictactoe/GameLogic.java

package de.tims.tictactoe;

public class GameLogic {

	private char[][] board;
	private final char[] occupiedFields = { 'x', 'o' };

	public GameLogic(int size) {
		if (size < 3) {
			size = 3;
		}
		this.board = new char[size][size];

		for (int i = 0; i < this.board.length; i++) {
			for (int j = 0; j < this.board[0].length; j++) {
				this.setField(i, j, '-');
			}
		}
	}

	public GameLogic(char[][] board) {
		this.board = board;
	}

	public char[][] getBoard() {
		return this.board;
	}

	public int countFields() {
		return this.board[0].length * this.board.length;
	}

	public void setField(int column, int row, char player) {
		if (fieldIsEmpty(column, row))
			this.board[column][row] = player;
	}

	public boolean fieldIsEmpty(int column, int row) {
		for (char field : this.occupiedFields) {
			if (this.board[column][row] == field)
				return false;
		}
		return true;
	}

	public boolean checkForWin(char player) {
		boolean finished = false;
		int countFields = 0;

		// check columns
		for (int i = 0; i < this.board.length; i++) {
			for (int j = 0; j < this.board[0].length; j++) {
				if (this.board[j][i] == player)
					countFields++;
			}
			if (countFields == this.board.length)
				return finished = true;
			countFields = 0;
		}
		// check rows
		for (int i = 0; i < this.board[0].length; i++) {
			for (int j = 0; j < this.board.length; j++) {
				if (this.board[i][j] == player)
					countFields++;
			}
			if (countFields == this.board.length)
				return finished = true;
			countFields = 0;
		}

		// check diagonal left
		for (int i = this.board.length - 1, j = this.board.length - 1; i >= 0; i--, j--) {
			if (this.board[i][j] == player)
				countFields++;
		}
		if (countFields == this.board.length)
			return finished = true;
		countFields = 0;

		// check diagonal right
		for (int i = this.board.length - 1, j = 0; i >= 0; i--, j++) {
			if (this.board[i][j] == player)
				countFields++;
		}
		if (countFields == this.board.length)
			return finished = true;

		return finished;
	}

	public boolean checkEndOfGame() {
		if (checkForWin('x')) return true;
		if (checkForWin('o')) return true;
		return false;
	}

}