1/*
2 * Copyright (C) 2011 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14
15package com.google.common.collect;
16
17import javax.annotation.Nullable;
18
19/**
20 * A descending wrapper around an {@code ImmutableSortedMultiset}
21 *
22 * @author Louis Wasserman
23 */
24@SuppressWarnings("serial") // uses writeReplace, not default serialization
25final class DescendingImmutableSortedMultiset<E> extends ImmutableSortedMultiset<E> {
26  private final transient ImmutableSortedMultiset<E> forward;
27
28  DescendingImmutableSortedMultiset(ImmutableSortedMultiset<E> forward) {
29    this.forward = forward;
30  }
31
32  @Override
33  public int count(@Nullable Object element) {
34    return forward.count(element);
35  }
36
37  @Override
38  public Entry<E> firstEntry() {
39    return forward.lastEntry();
40  }
41
42  @Override
43  public Entry<E> lastEntry() {
44    return forward.firstEntry();
45  }
46
47  @Override
48  public int size() {
49    return forward.size();
50  }
51
52  @Override
53  public ImmutableSortedSet<E> elementSet() {
54    return forward.elementSet().descendingSet();
55  }
56
57  @Override
58  Entry<E> getEntry(int index) {
59    return forward.entrySet().asList().reverse().get(index);
60  }
61
62  @Override
63  public ImmutableSortedMultiset<E> descendingMultiset() {
64    return forward;
65  }
66
67  @Override
68  public ImmutableSortedMultiset<E> headMultiset(E upperBound, BoundType boundType) {
69    return forward.tailMultiset(upperBound, boundType).descendingMultiset();
70  }
71
72  @Override
73  public ImmutableSortedMultiset<E> tailMultiset(E lowerBound, BoundType boundType) {
74    return forward.headMultiset(lowerBound, boundType).descendingMultiset();
75  }
76
77  @Override
78  boolean isPartialView() {
79    return forward.isPartialView();
80  }
81}
82