BoardFitness.java

package citydoku;

public class BoardFitness {
	public double evaluate(Board board) {
		double error = 0;

		for (int i = 0; i < 9; i++) {
			error += evaluateCell(board, i);
			error += evaluateRow(board, i);
			error += evaluateColumn(board, i);
		}

		return error;
	}

	public double evaluateRow(Board board, int y) {
		int duplicates = 0;
		boolean[] seen = new boolean[9];

		for (int x = 0; x < 9; x++) {
			int z = board.get(x, y);
			duplicates = seen[z] ? 1 : 0;
			seen[z] = true;
		}

		return duplicates;
	}

	public double evaluateColumn(Board board, int x) {
		int duplicates = 0;
		boolean[] seen = new boolean[9];

		for (int y = 0; y < 9; y++) {
			int z = board.get(x, y);
			duplicates = seen[z] ? 1 : 0;
			seen[z] = true;
		}

		return duplicates;
	}

	public double evaluateCell(Board board, int c) {
		int duplicates = 0;
		boolean[] seen = new boolean[9];
		int cellX = c % 3;
		int cellY = c / 3;

		for (int iy = 0; iy < 3; iy++) {
			for (int ix = 0; ix < 3; ix++) {
				int x = cellX * 3 + ix;
				int y = cellY * 3 + iy;
				int z = board.get(x, y);
				duplicates = seen[z] ? 1 : 0;
				seen[z] = true;
			}
		}

		return duplicates;
	}
}