com.google.common.collect.DescendingMultiset Maven / Gradle / Ivy
Go to download
This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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.GwtCompatible;
import com.google.j2objc.annotations.WeakOuter;
import java.util.Comparator;
import java.util.Iterator;
import java.util.NavigableSet;
import java.util.Set;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* A skeleton implementation of a descending multiset. Only needs {@code forwardMultiset()} and
* {@code entryIterator()}.
*
* @author Louis Wasserman
*/
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
abstract class DescendingMultiset extends ForwardingMultiset
implements SortedMultiset {
abstract SortedMultiset forwardMultiset();
@CheckForNull private transient Comparator super E> comparator;
@Override
public Comparator super E> comparator() {
Comparator super E> result = comparator;
if (result == null) {
return comparator = Ordering.from(forwardMultiset().comparator()).reverse();
}
return result;
}
@CheckForNull private transient NavigableSet elementSet;
@Override
public NavigableSet elementSet() {
NavigableSet result = elementSet;
if (result == null) {
return elementSet = new SortedMultisets.NavigableElementSet<>(this);
}
return result;
}
@Override
@CheckForNull
public Entry pollFirstEntry() {
return forwardMultiset().pollLastEntry();
}
@Override
@CheckForNull
public Entry pollLastEntry() {
return forwardMultiset().pollFirstEntry();
}
@Override
public SortedMultiset headMultiset(@ParametricNullness E toElement, BoundType boundType) {
return forwardMultiset().tailMultiset(toElement, boundType).descendingMultiset();
}
@Override
public SortedMultiset subMultiset(
@ParametricNullness E fromElement,
BoundType fromBoundType,
@ParametricNullness E toElement,
BoundType toBoundType) {
return forwardMultiset()
.subMultiset(toElement, toBoundType, fromElement, fromBoundType)
.descendingMultiset();
}
@Override
public SortedMultiset tailMultiset(@ParametricNullness E fromElement, BoundType boundType) {
return forwardMultiset().headMultiset(fromElement, boundType).descendingMultiset();
}
@Override
protected Multiset delegate() {
return forwardMultiset();
}
@Override
public SortedMultiset descendingMultiset() {
return forwardMultiset();
}
@Override
@CheckForNull
public Entry firstEntry() {
return forwardMultiset().lastEntry();
}
@Override
@CheckForNull
public Entry lastEntry() {
return forwardMultiset().firstEntry();
}
abstract Iterator> entryIterator();
@CheckForNull private transient Set> entrySet;
@Override
public Set> entrySet() {
Set> result = entrySet;
return (result == null) ? entrySet = createEntrySet() : result;
}
Set> createEntrySet() {
@WeakOuter
class EntrySetImpl extends Multisets.EntrySet {
@Override
Multiset multiset() {
return DescendingMultiset.this;
}
@Override
public Iterator> iterator() {
return entryIterator();
}
@Override
public int size() {
return forwardMultiset().entrySet().size();
}
}
return new EntrySetImpl();
}
@Override
public Iterator iterator() {
return Multisets.iteratorImpl(this);
}
@Override
public @Nullable Object[] toArray() {
return standardToArray();
}
@Override
@SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations
public T[] toArray(T[] array) {
return standardToArray(array);
}
@Override
public String toString() {
return entrySet().toString();
}
}