com.google.common.collect.AbstractSortedSetMultimap Maven / Gradle / Ivy
/*
* Copyright (C) 2007 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 java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.NavigableSet;
import java.util.SortedSet;
/**
* Basic implementation of the {@link SortedSetMultimap} interface. It's a wrapper around {@link
* AbstractMapBasedMultimap} that converts the returned collections into sorted sets. The {@link
* #createCollection} method must return a {@code SortedSet}.
*
* @author Jared Levy
*/
@GwtCompatible
abstract class AbstractSortedSetMultimap extends AbstractSetMultimap
implements SortedSetMultimap {
/**
* Creates a new multimap that uses the provided map.
*
* @param map place to store the mapping from each key to its corresponding values
*/
protected AbstractSortedSetMultimap(Map> map) {
super(map);
}
@Override
abstract SortedSet createCollection();
@Override
SortedSet createUnmodifiableEmptyCollection() {
return unmodifiableCollectionSubclass(createCollection());
}
@Override
SortedSet unmodifiableCollectionSubclass(Collection collection) {
if (collection instanceof NavigableSet) {
return Sets.unmodifiableNavigableSet((NavigableSet) collection);
} else {
return Collections.unmodifiableSortedSet((SortedSet) collection);
}
}
@Override
Collection wrapCollection(K key, Collection collection) {
if (collection instanceof NavigableSet) {
return new WrappedNavigableSet(key, (NavigableSet) collection, null);
} else {
return new WrappedSortedSet(key, (SortedSet) collection, null);
}
}
// Following Javadoc copied from Multimap and SortedSetMultimap.
/**
* Returns a collection view of all values associated with a key. If no mappings in the multimap
* have the provided key, an empty collection is returned.
*
* Changes to the returned collection will update the underlying multimap, and vice versa.
*
*
Because a {@code SortedSetMultimap} has unique sorted values for a given key, this method
* returns a {@link SortedSet}, instead of the {@link Collection} specified in the {@link
* Multimap} interface.
*/
@Override
public SortedSet get(K key) {
return (SortedSet) super.get(key);
}
/**
* Removes all values associated with a given key. The returned collection is immutable.
*
* Because a {@code SortedSetMultimap} has unique sorted values for a given key, this method
* returns a {@link SortedSet}, instead of the {@link Collection} specified in the {@link
* Multimap} interface.
*/
@Override
public SortedSet removeAll(Object key) {
return (SortedSet) super.removeAll(key);
}
/**
* Stores a collection of values with the same key, replacing any existing values for that key.
* The returned collection is immutable.
*
* Because a {@code SortedSetMultimap} has unique sorted values for a given key, this method
* returns a {@link SortedSet}, instead of the {@link Collection} specified in the {@link
* Multimap} interface.
*
*
Any duplicates in {@code values} will be stored in the multimap once.
*/
@Override
public SortedSet replaceValues(K key, Iterable values) {
return (SortedSet) super.replaceValues(key, values);
}
/**
* Returns a map view that associates each key with the corresponding values in the multimap.
* Changes to the returned map, such as element removal, will update the underlying multimap. The
* map does not support {@code setValue} on its entries, {@code put}, or {@code putAll}.
*
* When passed a key that is present in the map, {@code asMap().get(Object)} has the same
* behavior as {@link #get}, returning a live collection. When passed a key that is not present,
* however, {@code asMap().get(Object)} returns {@code null} instead of an empty collection.
*
*
Though the method signature doesn't say so explicitly, the returned map has {@link
* SortedSet} values.
*/
@Override
public Map> asMap() {
return super.asMap();
}
/**
* {@inheritDoc}
*
* Consequently, the values do not follow their natural ordering or the ordering of the value
* comparator.
*/
@Override
public Collection values() {
return super.values();
}
private static final long serialVersionUID = 430848587173315748L;
}