private void moveGamePiece() {
Position newPosition = findNewPosition();
while (position2Piece.containsKey(newPosition)) {
newPosition = findNewPosition();
}
moveTo(newPosition, gamePiece);
}
private GameState invokeMove(Piece piece, Position position) {
if (position2Piece.containsKey(position)) {
throw new IllegalArgumentException("Position " + position + " is already occupied");
}
moveTo(position, piece);
moveGamePiece();
return createBoard();
}
@Override
public void move(Piece piece, Position position, ResultHandler<GameState> resultHandler) {
try {
final Position oldPosition = piece2Position.get(piece);
final GameState gameState = invokeMove(piece, position);
resultHandler.result(gameState);
nofityListeners(new Move(oldPosition, position));
} catch (Exception e) {
handleException(e, resultHandler);
}
}
private void clear() {
piece2Position.clear();
position2Piece.clear();
}
private void moveTo(Position position, Piece piece) {
Position oldPosition = piece2Position.get(piece);
position2Piece.remove(oldPosition);
position2Piece.put(position, piece);
piece2Position.put(piece, position);
}