@Override
public int hashCode() {
int result = left != null ? left.hashCode() : 0;
result = 31 * result + (middle != null ? middle.hashCode() : 0);
result = 31 * result + (right != null ? right.hashCode() : 0);
return result;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((left == null) ? 0 : left.hashCode());
result = prime * result + ((middle == null) ? 0 : middle.hashCode());
result = prime * result + ((right == null) ? 0 : right.hashCode());
return result;
}