/*
    * Copyright (C) 2011 The Guava Authors
    *
    * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
    * in compliance with the License. You may obtain a copy of the License at
    *
    * http://www.apache.org/licenses/LICENSE-2.0
    *
    * Unless required by applicable law or agreed to in writing, software distributed under the License
   * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
   * or implied. See the License for the specific language governing permissions and limitations under
   * the License.
   */
  
  package com.google.common.collect;
  
  import javax.annotation.Nullable;
  
  /**
   * A descending wrapper around an {@code ImmutableSortedMultiset}
   *
   * @author Louis Wasserman
   */
  @SuppressWarnings("serial") // uses writeReplace, not default serialization
  final class DescendingImmutableSortedMultiset<E> extends ImmutableSortedMultiset<E> {
    private final transient ImmutableSortedMultiset<E> forward;
  
    DescendingImmutableSortedMultiset(ImmutableSortedMultiset<E> forward) {
      this.forward = forward;
    }
  
    @Override
    public int count(@Nullable Object element) {
      return forward.count(element);
    }
  
    @Override
    public Entry<E> firstEntry() {
      return forward.lastEntry();
    }
  
    @Override
    public Entry<E> lastEntry() {
      return forward.firstEntry();
    }
  
    @Override
    public int size() {
      return forward.size();
    }
  
    @Override
    public ImmutableSortedSet<E> elementSet() {
      return forward.elementSet().descendingSet();
    }
  
    @Override
    Entry<E> getEntry(int index) {
      return forward.entrySet().asList().reverse().get(index);
    }
  
    @Override
    public ImmutableSortedMultiset<E> descendingMultiset() {
      return forward;
    }
  
    @Override
    public ImmutableSortedMultiset<E> headMultiset(E upperBound, BoundType boundType) {
      return forward.tailMultiset(upperBound, boundType).descendingMultiset();
    }
  
    @Override
    public ImmutableSortedMultiset<E> tailMultiset(E lowerBound, BoundType boundType) {
      return forward.headMultiset(lowerBound, boundType).descendingMultiset();
    }
  
    @Override
    boolean isPartialView() {
      return forward.isPartialView();
    }
  }