public static boolean isLineAvailableBetweenBoxes(Board board, Box box1, Box box2) {
if (!areNeighborBoxes(box1, box2)) return false;
int x = (box1.getColumn() + box2.getColumn()) / 2;
int y = (box1.getRow() + box2.getRow()) / 2;
Line line = board.getLineByCoordinate(x, y);
return line != null && line.getOwner() == null;
}
public static List<Line> getLinesSurroundingBox(Board board, Box box) {
int x = box.getColumn();
int y = box.getRow();
int surroundingLines[][] = {
{x - 1, y},
{x + 1, y},
{x, y - 1},
{x, y + 1}
};
return Arrays.stream(surroundingLines)
.map(coords -> board.getLineByCoordinate(coords[0], coords[1]))
.filter(line -> line != null)
.collect(Collectors.toList());
}