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/*
* 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
ImmutableSet<Entry<E>> createEntrySet() {
final ImmutableSet<Entry<E>> forwardEntrySet = forward.entrySet();
return new EntrySet() {
@Override
public int size() {
return forwardEntrySet.size();
}
@Override
public UnmodifiableIterator<Entry<E>> iterator() {
return asList().iterator();
}
@Override
ImmutableList<Entry<E>> createAsList() {
return forwardEntrySet.asList().reverse();
}
};
}
@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();
}
}
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