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/*
 * Copyright (C) 2012 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 com.google.common.annotations.GwtIncompatible;

import javax.annotation.Nullable;

/**
 * Skeletal implementation of {@link ImmutableSortedSet#descendingSet()}.
 *
 * @author Louis Wasserman
 */
class DescendingImmutableSortedSet extends ImmutableSortedSet {
  private final ImmutableSortedSet forward;

  DescendingImmutableSortedSet(ImmutableSortedSet forward) {
    super(Ordering.from(forward.comparator()).reverse());
    this.forward = forward;
  }

  @Override
  public int size() {
    return forward.size();
  }

  @Override
  public UnmodifiableIterator iterator() {
    return forward.descendingIterator();
  }

  @Override
  ImmutableSortedSet headSetImpl(E toElement, boolean inclusive) {
    return forward.tailSet(toElement, inclusive).descendingSet();
  }

  @Override
  ImmutableSortedSet subSetImpl(
      E fromElement, boolean fromInclusive, E toElement, boolean toInclusive) {
    return forward.subSet(toElement, toInclusive, fromElement, fromInclusive).descendingSet();
  }

  @Override
  ImmutableSortedSet tailSetImpl(E fromElement, boolean inclusive) {
    return forward.headSet(fromElement, inclusive).descendingSet();
  }

  @Override
  @GwtIncompatible("NavigableSet")
  public ImmutableSortedSet descendingSet() {
    return forward;
  }

  @Override
  @GwtIncompatible("NavigableSet")
  public UnmodifiableIterator descendingIterator() {
    return forward.iterator();
  }

  @Override
  @GwtIncompatible("NavigableSet")
  ImmutableSortedSet createDescendingSet() {
    throw new AssertionError("should never be called");
  }

  @Override
  public E lower(E element) {
    return forward.higher(element);
  }

  @Override
  public E floor(E element) {
    return forward.ceiling(element);
  }

  @Override
  public E ceiling(E element) {
    return forward.floor(element);
  }

  @Override
  public E higher(E element) {
    return forward.lower(element);
  }

  @Override
  int indexOf(@Nullable Object target) {
    int index = forward.indexOf(target);
    if (index == -1) {
      return index;
    } else {
      return size() - 1 - index;
    }
  }

  @Override
  boolean isPartialView() {
    return forward.isPartialView();
  }
}