/**
* Returns a collection of multiset entries representing the counts of the distinct elements, in
* sorted order. Does not check for null.
*/
public static <E> Collection<Multiset.Entry<E>> sortedCounts(
Comparator<? super E> comparator, Iterable<E> elements) {
if (elements instanceof Multiset) {
Multiset<E> multiset = (Multiset<E>) elements;
if (hasSameComparator(comparator, elements)) {
return multiset.entrySet();
}
List<Multiset.Entry<E>> entries = Lists.newArrayList(multiset.entrySet());
Collections.sort(
entries,
Ordering.from(comparator)
.onResultOf(
new Function<Multiset.Entry<E>, E>() {
@Override
public E apply(Entry<E> entry) {
return entry.getElement();
}
}));
return entries;
} else if (elements instanceof Set) { // known distinct
Collection<E> sortedElements;
if (hasSameComparator(comparator, elements)) {
sortedElements = (Collection<E>) elements;
} else {
List<E> list = Lists.newArrayList(elements);
Collections.sort(list, comparator);
sortedElements = list;
}
return singletonEntries(sortedElements);
} else if (hasSameComparator(comparator, elements)) {
E current = null;
int currentCount = 0;
List<Multiset.Entry<E>> sortedEntries = Lists.newArrayList();
for (E e : elements) {
if (currentCount > 0) {
if (comparator.compare(current, e) == 0) {
currentCount++;
} else {
sortedEntries.add(Multisets.immutableEntry(current, currentCount));
current = e;
currentCount = 1;
}
} else {
current = e;
currentCount = 1;
}
}
if (currentCount > 0) {
sortedEntries.add(Multisets.immutableEntry(current, currentCount));
}
return sortedEntries;
}
TreeMultiset<E> multiset = TreeMultiset.create(comparator);
Iterables.addAll(multiset, elements);
return multiset.entrySet();
}
@Override
public SampleElements<Multiset.Entry<E>> samples() {
SampleElements<E> samples = gen.samples();
return new SampleElements<Multiset.Entry<E>>(
Multisets.immutableEntry(samples.e0, 3),
Multisets.immutableEntry(samples.e1, 4),
Multisets.immutableEntry(samples.e2, 1),
Multisets.immutableEntry(samples.e3, 5),
Multisets.immutableEntry(samples.e4, 2));
}
@Override
public String toString() {
return Multisets.immutableEntry(getElement(), getCount()).toString();
}