2 * (C) Copyright 2016 Pantheon Technologies, s.r.o. and others.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package org.opendaylight.yangtools.triemap;
18 import static org.opendaylight.yangtools.triemap.ImmutableTrieMap.unsupported;
20 import com.google.common.collect.Iterators;
21 import java.util.Collection;
22 import java.util.Iterator;
23 import java.util.Map.Entry;
24 import java.util.Spliterator;
27 * An immutable view of a TrieMap's key set.
29 * @author Robert Varga
31 * @param <K> the type of keys
33 final class ImmutableKeySet<K> extends AbstractKeySet<K> {
34 ImmutableKeySet(final TrieMap<K, ?> map) {
39 public Iterator<K> iterator() {
40 return Iterators.transform(map().immutableIterator(), Entry::getKey);
49 @SuppressWarnings("checkstyle:parameterName")
50 public boolean remove(final Object o) {
55 @SuppressWarnings("checkstyle:parameterName")
56 public boolean retainAll(final Collection<?> c) {
61 @SuppressWarnings("checkstyle:parameterName")
62 public boolean removeAll(final Collection<?> c) {
67 int spliteratorCharacteristics() {
68 return Spliterator.DISTINCT | Spliterator.IMMUTABLE | Spliterator.NONNULL;