@Override
public SortedMap<K, V> subMap(K fromKey, K toKey) {
Comparator<K> comparator = naturalComparator();
return ((comparator.compare(this.entry.getKey(), toKey) < 0)
&& (comparator.compare(this.entry.getKey(), fromKey) >= 0))
? this
: Collections.<K, V>emptySortedMap();
}
@Override
public SortedMap<K, V> tailMap(K fromKey) {
return (naturalComparator().compare(this.entry.getKey(), fromKey) >= 0)
? this
: Collections.<K, V>emptySortedMap();
}
@Override
public SortedMap<K, V> headMap(K toKey) {
return (naturalComparator().compare(this.entry.getKey(), toKey) < 0)
? this
: Collections.<K, V>emptySortedMap();
}
@Test
public void emptySortedMap() {
this.verify(
Collections.<Integer, String>emptySortedMap(), new TreeMap<Integer, String>(), 0, 1, "");
}