com.google.common.collect
Class ImmutableSetMultimap<K,V>

java.lang.Object
  com.google.common.collect.ImmutableMultimap<K,V>
      com.google.common.collect.ImmutableSetMultimap<K,V>

All Implemented Interfaces:

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

@GwtCompatible(serializable=true,
               emulated=true)
public class ImmutableSetMultimap<K,V>
extends ImmutableMultimap<K,V>
implements SetMultimap<K,V>

An immutable SetMultimap with reliable user-specified key and value iteration order. Does not permit null keys or values.

Unlike Multimaps.unmodifiableSetMultimap(SetMultimap), which is a view of a separate multimap which can still change, an instance of ImmutableSetMultimap contains its own data and will never change. ImmutableSetMultimap is convenient for public static final multimaps ("constant multimaps") and also lets you easily make a "defensive copy" of a multimap provided to your class by a caller.

Note: Although this class is not final, it cannot be subclassed as it has no public or protected constructors. Thus, instances of this class are guaranteed to be immutable.

See the Guava User Guide article on immutable collections.

Since:

2.0 (imported from Google Collections Library)

Author:

Mike Ward

See Also:

Serialized Form

Nested Class Summary

static class

ImmutableSetMultimap.Builder<K,V> A builder for creating immutable SetMultimap instances, especially public static final multimaps ("constant multimaps").

Method Summary

static <K,V> ImmutableSetMultimap.Builder<K,V>	builder() Returns a new ImmutableSetMultimap.Builder.
static <K,V> ImmutableSetMultimap<K,V>	copyOf(Multimap<? extends K,? extends V> multimap) Returns an immutable set multimap containing the same mappings as multimap.
ImmutableSet<Map.Entry<K,V>>	entries() Returns an immutable collection of all key-value pairs in the multimap.
ImmutableSet<V>	get(K key) Returns an immutable set of the values for the given key.
ImmutableSetMultimap<V,K>	inverse() Returns an immutable multimap which is the inverse of this one.
static <K,V> ImmutableSetMultimap<K,V>	of() Returns the empty multimap.
static <K,V> ImmutableSetMultimap<K,V>	of(K k1, V v1) Returns an immutable multimap containing a single entry.
static <K,V> ImmutableSetMultimap<K,V>	of(K k1, V v1, K k2, V v2) Returns an immutable multimap containing the given entries, in order.
static <K,V> ImmutableSetMultimap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3) Returns an immutable multimap containing the given entries, in order.
static <K,V> ImmutableSetMultimap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4) Returns an immutable multimap containing the given entries, in order.
static <K,V> ImmutableSetMultimap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5) Returns an immutable multimap containing the given entries, in order.
ImmutableSet<V>	removeAll(Object key) Guaranteed to throw an exception and leave the multimap unmodified.
ImmutableSet<V>	replaceValues(K key, Iterable<? extends V> values) Guaranteed to throw an exception and leave the multimap unmodified.

Methods inherited from class com.google.common.collect.ImmutableMultimap

asMap, clear, containsEntry, containsKey, containsValue, equals, hashCode, isEmpty, keys, keySet, put, putAll, putAll, remove, size, toString, values

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.google.common.collect.SetMultimap

asMap, equals

Methods inherited from interface com.google.common.collect.Multimap

clear, containsEntry, containsKey, containsValue, hashCode, isEmpty, keys, keySet, put, putAll, putAll, remove, size, values

Method Detail

of

public static <K,V> ImmutableSetMultimap<K,V> of()

Returns the empty multimap.

of

public static <K,V> ImmutableSetMultimap<K,V> of(K k1,
                                                 V v1)

Returns an immutable multimap containing a single entry.

of

public static <K,V> ImmutableSetMultimap<K,V> of(K k1,
                                                 V v1,
                                                 K k2,
                                                 V v2)

Returns an immutable multimap containing the given entries, in order. Repeated occurrences of an entry (according to Object.equals(java.lang.Object)) after the first are ignored.

of

public static <K,V> ImmutableSetMultimap<K,V> of(K k1,
                                                 V v1,
                                                 K k2,
                                                 V v2,
                                                 K k3,
                                                 V v3)

Returns an immutable multimap containing the given entries, in order. Repeated occurrences of an entry (according to Object.equals(java.lang.Object)) after the first are ignored.

of

public static <K,V> ImmutableSetMultimap<K,V> of(K k1,
                                                 V v1,
                                                 K k2,
                                                 V v2,
                                                 K k3,
                                                 V v3,
                                                 K k4,
                                                 V v4)

Returns an immutable multimap containing the given entries, in order. Repeated occurrences of an entry (according to Object.equals(java.lang.Object)) after the first are ignored.

of

public static <K,V> ImmutableSetMultimap<K,V> of(K k1,
                                                 V v1,
                                                 K k2,
                                                 V v2,
                                                 K k3,
                                                 V v3,
                                                 K k4,
                                                 V v4,
                                                 K k5,
                                                 V v5)

Returns an immutable multimap containing the given entries, in order. Repeated occurrences of an entry (according to Object.equals(java.lang.Object)) after the first are ignored.

builder

public static <K,V> ImmutableSetMultimap.Builder<K,V> builder()

Returns a new ImmutableSetMultimap.Builder.

copyOf

public static <K,V> ImmutableSetMultimap<K,V> copyOf(Multimap<? extends K,? extends V> multimap)

Returns an immutable set multimap containing the same mappings as multimap. The generated multimap's key and value orderings correspond to the iteration ordering of the multimap.asMap() view. Repeated occurrences of an entry in the multimap after the first are ignored.

Despite the method name, this method attempts to avoid actually copying the data when it is safe to do so. The exact circumstances under which a copy will or will not be performed are undocumented and subject to change.

Throws:

NullPointerException - if any key or value in multimap is null

get

public ImmutableSet<V> get(@Nullable
                           K key)

Returns an immutable set of the values for the given key. If no mappings in the multimap have the provided key, an empty immutable set is returned. The values are in the same order as the parameters used to build this multimap.

Specified by:

get in interface Multimap<K,V>

Specified by:

get in interface SetMultimap<K,V>

Specified by:

get in class ImmutableMultimap<K,V>

Parameters:

key - key to search for in multimap

Returns:

the collection of values that the key maps to

inverse

@Beta
public ImmutableSetMultimap<V,K> inverse()

Returns an immutable multimap which is the inverse of this one. For every key-value mapping in the original, the result will have a mapping with key and value reversed.

Because an inverse of a set multimap cannot contain multiple pairs with the same key and value, this method returns an ImmutableSetMultimap rather than the ImmutableMultimap specified in the ImmutableMultimap class.

Specified by:

inverse in class ImmutableMultimap<K,V>

Since:

11

removeAll

public ImmutableSet<V> removeAll(Object key)

Guaranteed to throw an exception and leave the multimap unmodified.

Specified by:

removeAll in interface Multimap<K,V>

Specified by:

removeAll in interface SetMultimap<K,V>

Overrides:

removeAll in class ImmutableMultimap<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.

Throws:

UnsupportedOperationException - always

replaceValues

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

Guaranteed to throw an exception and leave the multimap unmodified.

Specified by:

replaceValues in interface Multimap<K,V>

Specified by:

replaceValues in interface SetMultimap<K,V>

Overrides:

replaceValues in class ImmutableMultimap<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.

Throws:

UnsupportedOperationException - always

entries

public ImmutableSet<Map.Entry<K,V>> entries()

Returns an immutable collection of all key-value pairs in the multimap. Its iterator traverses the values for the first key, the values for the second key, and so on.

Specified by:

entries in interface Multimap<K,V>

Specified by:

entries in interface SetMultimap<K,V>

Overrides:

entries in class ImmutableMultimap<K,V>

Returns:

collection of map entries consisting of key-value pairs