Method filterKeys

output/java_guava/1.4.18/Maps.java:2282–2286

Returns a map containing the mappings in unfiltered whose keys satisfy a predicate. The returned map is a live view of unfiltered; changes to one affect the other. The resulting map's keySet(), entrySet(), and values() views have iterators that don't suppo

(Map<K, V> unfiltered, final Predicate<? super K> keyPredicate)

  public static <K, V> Map<K, V> filterKeys(Map<K, V> unfiltered, final Predicate<? super K> keyPredicate) {
    checkNotNull(keyPredicate);
    Predicate<Entry<K, ?>> entryPredicate = keyPredicateOnEntries(keyPredicate);
    return (unfiltered instanceof AbstractFilteredMap) ? filterFiltered((AbstractFilteredMap<K, V>) unfiltered, entryPredicate) : new FilteredKeyMap<K, V>(checkNotNull(unfiltered), keyPredicate, entryPredicate);
  }

  /**
   * Returns a sorted map containing the mappings in {@code unfiltered} whose