/**
* Build the grouping table forming groups of items with equal keys. This form of grouping allows
* a member of the population to be present in zero or more groups, one for each value of the
* grouping key.
*/
private void buildIndexedGroups() throws XPathException {
HashMap index = new HashMap(40);
XPathContext c2 = keyContext.newMinorContext();
c2.setCurrentIterator(population);
while (true) {
Item item = population.next();
if (item == null) {
break;
}
processItem(index, item, c2);
}
}
/*@NotNull*/
public SequenceIterator getAnother() throws XPathException {
XPathContext c2 = keyContext.newMinorContext();
return new GroupByIterator(population.getAnother(), keyExpression, c2, collator);
}