public void trim(ColumnFamily cf, int trimTo, long now) {
// each cell can increment the count by at most one, so if we have fewer cells than trimTo, we
// can skip trimming
if (cf.getColumnCount() < trimTo) return;
ColumnCounter counter = columnCounter(cf.getComparator(), now);
Collection<Cell> cells = reversed ? cf.getReverseSortedColumns() : cf.getSortedColumns();
DeletionInfo.InOrderTester tester = cf.deletionInfo().inOrderTester(reversed);
for (Iterator<Cell> iter = cells.iterator(); iter.hasNext(); ) {
Cell cell = iter.next();
counter.count(cell, tester);
if (counter.live() > trimTo) {
iter.remove();
while (iter.hasNext()) {
iter.next();
iter.remove();
}
}
}
}
protected static Column lastColumn(ColumnFamily cf) {
return cf.getReverseSortedColumns().iterator().next();
}