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 com.google.common.base.Preconditions.checkNotNull;
20 import java.util.AbstractSet;
21 import java.util.Collection;
24 * Abstract base class for key set views of a TrieMap.
26 * @author Robert Varga
28 * @param <K> the type of keys
30 abstract class AbstractKeySet<K> extends AbstractSet<K> {
31 private final TrieMap<K, ?> map;
33 AbstractKeySet(final TrieMap<K, ?> map) {
34 this.map = checkNotNull(map);
37 final TrieMap<K, ?> map() {
42 @SuppressWarnings("checkstyle:parameterName")
43 public final boolean add(final K e) {
44 throw new UnsupportedOperationException();
48 @SuppressWarnings("checkstyle:parameterName")
49 public final boolean addAll(final Collection<? extends K> c) {
50 throw new UnsupportedOperationException();
54 @SuppressWarnings("checkstyle:parameterName")
55 public final boolean contains(final Object o) {
56 return map.containsKey(o);
60 public final boolean isEmpty() {
65 public final int size() {