public RolapMember getLeadMember(RolapMember member, int n) {
int i = 0;
int increment = 1;
if (n < 0) {
increment = -1;
n = -n;
}
while (i < n) {
member = memberReader.getLeadMember(member, increment);
if (member.isNull()) {
return member;
}
if (canSee(member)) {
++i;
}
}
return member;
}
