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/*
* 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 com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.Collection;
import java.util.Comparator;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import org.checkerframework.checker.nullness.compatqual.NullableDecl;
/**
* A {@code SetMultimap} whose set of values for a given key are kept sorted; that is, they comprise
* a {@link SortedSet}. It cannot hold duplicate key-value pairs; adding a key-value pair that's
* already in the multimap has no effect. This interface does not specify the ordering of the
* multimap's keys. See the {@link Multimap} documentation for information common to all multimaps.
*
* The {@link #get}, {@link #removeAll}, and {@link #replaceValues} methods each return a {@link
* SortedSet} of values, while {@link Multimap#entries()} returns a {@link Set} of map entries.
* Though the method signature doesn't say so explicitly, the map returned by {@link #asMap} has
* {@code SortedSet} values.
*
*
See the Guava User Guide article on {@code
* Multimap}.
*
* @author Jared Levy
* @since 2.0
*/
@GwtCompatible
public interface SortedSetMultimap extends SetMultimap {
// Following Javadoc copied from Multimap.
/**
* 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 java.util.Collection} specified in the
* {@link Multimap} interface.
*/
@Override
SortedSet get(@NullableDecl K key);
/**
* Removes all values associated with a given key.
*
* Because a {@code SortedSetMultimap} has unique sorted values for a given key, this method
* returns a {@link SortedSet}, instead of the {@link java.util.Collection} specified in the
* {@link Multimap} interface.
*/
@CanIgnoreReturnValue
@Override
SortedSet removeAll(@NullableDecl Object key);
/**
* Stores a collection of values with the same key, replacing any existing values for that key.
*
* Because a {@code SortedSetMultimap} has unique sorted values for a given key, this method
* returns a {@link SortedSet}, instead of the {@link java.util.Collection} specified in the
* {@link Multimap} interface.
*
*
Any duplicates in {@code values} will be stored in the multimap once.
*/
@CanIgnoreReturnValue
@Override
SortedSet replaceValues(K key, Iterable 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.
*
*
Note: The returned map's values are guaranteed to be of type {@link SortedSet}. To
* obtain this map with the more specific generic type {@code Map>}, call {@link
* Multimaps#asMap(SortedSetMultimap)} instead. However, the returned map itself is
* not necessarily a {@link SortedMap}: A {@code SortedSetMultimap} must expose the values
* for a given key in sorted order, but it need not expose the keys in sorted order.
* Individual {@code SortedSetMultimap} implementations, like those built with {@link
* MultimapBuilder#treeKeys()}, may make additional guarantees.
*/
@Override
Map> asMap();
/**
* Returns the comparator that orders the multimap values, with {@code null} indicating that
* natural ordering is used.
*/
Comparator valueComparator();
}