/**
* Filter the output of the constraint for the specified column and only return results that have
* the specified value.
*
* @param constraint
* @param columns to match against
* @return a filtered list of key-values
*/
private List<CKeyValue> filterConstraint(Result toFilter, CColumn columns) {
// if there are no results, just return an empty list
if (!toFilter.getKeyValues().iterator().hasNext()) return Collections.EMPTY_LIST;
List<CKeyValue> rows = new ArrayList<CKeyValue>();
LexicographicByteArrayComparator comparator = LexicographicByteArrayComparator.INSTANCE;
for (CKeyValue kv : toFilter.getKeyValues()) {
// if we are accepting all CFs
if (comparator.compare(CColumn.ALL_COLUMNS.getColumnFamily(), columns.getColumnFamily()) == 0)
rows.add(kv);
// since we aren't accepting all CFs, check the stored against the sent
if (comparator.compare(columns.getColumnFamily(), kv.getFamily()) == 0) {
// if we are accepting all CQs
if (comparator.compare(
CColumn.ALL_COLUMNS.getColumnQualifier(), columns.getColumnQualifier())
== 0) rows.add(kv);
// since we aren't accepting all CQs, check the stored against the sent
if (comparator.compare(columns.getColumnQualifier(), kv.getQualifier()) == 0) rows.add(kv);
}
}
return rows;
}
