com.google.common.collect
Interface SortedSetMultimap<K,V>

All Superinterfaces:

Multimap<K,V>, SetMultimap<K,V>

All Known Implementing Classes:

ForwardingSortedSetMultimap, TreeMultimap

@GwtCompatible
public interface SortedSetMultimap<K,V>
extends SetMultimap<K,V>

A SetMultimap whose set of values for a given key are kept sorted; that is, they comprise a 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.

The get(K), removeAll(java.lang.Object), and replaceValues(K, java.lang.Iterable) methods each return a SortedSet of values, while Multimap.entries() returns a Set of map entries. Though the method signature doesn't say so explicitly, the map returned by asMap() has SortedSet values.

Since:

2 (imported from Google Collections Library)

Author:

Jared Levy

get

SortedSet<V> get(@Nullable
                 K key)

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 SortedSetMultimap has unique sorted values for a given key, this method returns a SortedSet, instead of the Collection specified in the Multimap interface.

Specified by:

get in interface Multimap<K,V>

Specified by:

get in interface SetMultimap<K,V>

Parameters:

key - key to search for in multimap

Returns:

the collection of values that the key maps to

removeAll

SortedSet<V> removeAll(@Nullable
                       Object key)

Removes all values associated with a given key.

Because a SortedSetMultimap has unique sorted values for a given key, this method returns a SortedSet, instead of the Collection specified in the Multimap interface.

Specified by:

removeAll in interface Multimap<K,V>

Specified by:

removeAll in interface SetMultimap<K,V>

Parameters:

key - key of entries to remove from the multimap

Returns:

the collection of removed values, or an empty collection if no values were associated with the provided key. The collection may be modifiable, but updating it will have no effect on the multimap.

replaceValues

SortedSet<V> replaceValues(K key,
                           Iterable<? extends V> values)

Stores a collection of values with the same key, replacing any existing values for that key.

Because a SortedSetMultimap has unique sorted values for a given key, this method returns a SortedSet, instead of the Collection specified in the Multimap interface.

Any duplicates in values will be stored in the multimap once.

Specified by:

replaceValues in interface Multimap<K,V>

Specified by:

replaceValues in interface SetMultimap<K,V>

Parameters:

key - key to store in the multimap

values - values to store in the multimap

Returns:

the collection of replaced values, or an empty collection if no values were previously associated with the key. The collection may be modifiable, but updating it will have no effect on the multimap.

asMap

Map<K,Collection<V>> asMap()

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 setValue() on its entries, put, or putAll.

When passed a key that is present in the map, asMap().get(Object) has the same behavior as get(K), returning a live collection. When passed a key that is not present, however, asMap().get(Object) returns null instead of an empty collection.

Though the method signature doesn't say so explicitly, the returned map has SortedSet values.

Specified by:

asMap in interface Multimap<K,V>

Specified by:

asMap in interface SetMultimap<K,V>

Returns:

a map view from a key to its collection of values

valueComparator

Comparator<? super V> valueComparator()

Returns the comparator that orders the multimap values, with a null indicating that natural ordering is used.