001    /*
002     * Copyright (C) 2007 The Guava Authors
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package com.google.common.collect;
018    
019    import com.google.common.annotations.GwtCompatible;
020    
021    import java.util.Collection;
022    import java.util.Comparator;
023    import java.util.Map;
024    import java.util.Set;
025    import java.util.SortedSet;
026    
027    import javax.annotation.Nullable;
028    
029    /**
030     * A {@code SetMultimap} whose set of values for a given key are kept sorted;
031     * that is, they comprise a {@link SortedSet}. It cannot hold duplicate
032     * key-value pairs; adding a key-value pair that's already in the multimap has
033     * no effect. This interface does not specify the ordering of the multimap's
034     * keys.
035     *
036     * <p>The {@link #get}, {@link #removeAll}, and {@link #replaceValues} methods
037     * each return a {@link SortedSet} of values, while {@link Multimap#entries()}
038     * returns a {@link Set} of map entries. Though the method signature doesn't say
039     * so explicitly, the map returned by {@link #asMap} has {@code SortedSet}
040     * values.
041     *
042     * @author Jared Levy
043     * @since 2.0 (imported from Google Collections Library)
044     */
045    @GwtCompatible
046    public interface SortedSetMultimap<K, V> extends SetMultimap<K, V> {
047      // Following Javadoc copied from Multimap.
048    
049      /**
050       * Returns a collection view of all values associated with a key. If no
051       * mappings in the multimap have the provided key, an empty collection is
052       * returned.
053       *
054       * <p>Changes to the returned collection will update the underlying multimap,
055       * and vice versa.
056       *
057       * <p>Because a {@code SortedSetMultimap} has unique sorted values for a given
058       * key, this method returns a {@link SortedSet}, instead of the
059       * {@link java.util.Collection} specified in the {@link Multimap} interface.
060       */
061      @Override
062      SortedSet<V> get(@Nullable K key);
063    
064      /**
065       * Removes all values associated with a given key.
066       *
067       * <p>Because a {@code SortedSetMultimap} has unique sorted values for a given
068       * key, this method returns a {@link SortedSet}, instead of the
069       * {@link java.util.Collection} specified in the {@link Multimap} interface.
070       */
071      @Override
072      SortedSet<V> removeAll(@Nullable Object key);
073    
074      /**
075       * Stores a collection of values with the same key, replacing any existing
076       * values for that key.
077       *
078       * <p>Because a {@code SortedSetMultimap} has unique sorted values for a given
079       * key, this method returns a {@link SortedSet}, instead of the
080       * {@link java.util.Collection} specified in the {@link Multimap} interface.
081       *
082       * <p>Any duplicates in {@code values} will be stored in the multimap once.
083       */
084      @Override
085      SortedSet<V> replaceValues(K key, Iterable<? extends V> values);
086    
087      /**
088       * Returns a map view that associates each key with the corresponding values
089       * in the multimap. Changes to the returned map, such as element removal, will
090       * update the underlying multimap. The map does not support {@code setValue()}
091       * on its entries, {@code put}, or {@code putAll}.
092       *
093       * <p>When passed a key that is present in the map, {@code
094       * asMap().get(Object)} has the same behavior as {@link #get}, returning a
095       * live collection. When passed a key that is not present, however, {@code
096       * asMap().get(Object)} returns {@code null} instead of an empty collection.
097       *
098       * <p>Though the method signature doesn't say so explicitly, the returned map
099       * has {@link SortedSet} values.
100       */
101      @Override
102      Map<K, Collection<V>> asMap();
103    
104      /**
105       * Returns the comparator that orders the multimap values, with {@code null}
106       * indicating that natural ordering is used.
107       */
108      Comparator<? super V> valueComparator();
109    }