com.google.common.collect

Class ImmutableBiMap<K,V>

java.lang.Object

com.google.common.collect.ImmutableMap<K,V>

com.google.common.collect.ImmutableBiMap<K,V>

All Implemented Interfaces:

BiMap<K,V>, Serializable, Map<K,V>

@GwtCompatible(serializable=true,
               emulated=true)
public abstract class ImmutableBiMap<K,V>
extends ImmutableMap<K,V>
implements BiMap<K,V>

An immutable BiMap with reliable user-specified iteration order. Does not permit null keys or values. An ImmutableBiMap and its inverse have the same iteration ordering.

An instance of ImmutableBiMap contains its own data and will never change. ImmutableBiMap is convenient for public static final maps ("constant maps") and also lets you easily make a "defensive copy" of a bimap 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.

Since:

2.0 (imported from Google Collections Library)

Author:

Jared Levy

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ImmutableBiMap.Builder<K,V> A builder for creating immutable bimap instances, especially public static final bimaps ("constant bimaps").

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Method Summary

Methods

Modifier and Type	Method and Description
static <K,V> ImmutableBiMap.Builder<K,V>	builder() Returns a new builder.
static <K,V> ImmutableBiMap<K,V>	copyOf(Map<? extends K,? extends V> map) Returns an immutable bimap containing the same entries as map.
V	forcePut(K key, V value) Deprecated. Unsupported operation.
abstract ImmutableBiMap<V,K>	inverse() Returns the inverse view of this bimap, which maps each of this bimap's values to its associated key.
static <K,V> ImmutableBiMap<K,V>	of() Returns the empty bimap.
static <K,V> ImmutableBiMap<K,V>	of(K k1, V v1) Returns an immutable bimap containing a single entry.
static <K,V> ImmutableBiMap<K,V>	of(K k1, V v1, K k2, V v2) Returns an immutable map containing the given entries, in order.
static <K,V> ImmutableBiMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3) Returns an immutable map containing the given entries, in order.
static <K,V> ImmutableBiMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4) Returns an immutable map containing the given entries, in order.
static <K,V> ImmutableBiMap<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 map containing the given entries, in order.
ImmutableSet<V>	values() Returns an immutable set of the values in this map.

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

asMultimap, clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, toString

Methods inherited from class java.lang.Object

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

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

put, putAll

Methods inherited from interface java.util.Map

clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, remove, size

Method Detail

of

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

Returns the empty bimap.

of

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

Returns an immutable bimap containing a single entry.

of

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

Returns an immutable map containing the given entries, in order.

Throws:

IllegalArgumentException - if duplicate keys or values are added

of

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

Returns an immutable map containing the given entries, in order.

Throws:

IllegalArgumentException - if duplicate keys or values are added

of

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

Returns an immutable map containing the given entries, in order.

Throws:

IllegalArgumentException - if duplicate keys or values are added

of

public static <K,V> ImmutableBiMap<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 map containing the given entries, in order.

Throws:

IllegalArgumentException - if duplicate keys or values are added

builder

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

Returns a new builder. The generated builder is equivalent to the builder created by the ImmutableBiMap.Builder constructor.

copyOf

public static <K,V> ImmutableBiMap<K,V> copyOf(Map<? extends K,? extends V> map)

Returns an immutable bimap containing the same entries as map. If map somehow contains entries with duplicate keys (for example, if it is a SortedMap whose comparator is not consistent with equals), the results of this method are undefined.

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:

IllegalArgumentException - if two keys have the same value

NullPointerException - if any key or value in map is null

inverse

public abstract ImmutableBiMap<V,K> inverse()

Returns the inverse view of this bimap, which maps each of this bimap's values to its associated key. The two bimaps are backed by the same data; any changes to one will appear in the other.

Note:There is no guaranteed correspondence between the iteration order of a bimap and that of its inverse.

The inverse of an ImmutableBiMap is another ImmutableBiMap.

Specified by:

inverse in interface BiMap<K,V>

Returns:

the inverse view of this bimap

values

public ImmutableSet<V> values()

Returns an immutable set of the values in this map. The values are in the same order as the parameters used to build this map.

Specified by:

values in interface BiMap<K,V>

Specified by:

values in interface Map<K,V>

Overrides:

values in class ImmutableMap<K,V>

Returns:

a collection view of the values contained in this map

forcePut

@Deprecated
public V forcePut(K key,
                    V value)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the bimap unmodified.

Specified by:

forcePut in interface BiMap<K,V>

Parameters:

key - the key with which the specified value is to be associated

value - the value to be associated with the specified key

Returns:

the value which was previously associated with the key, which may be null, or null if there was no previous entry

Throws:

UnsupportedOperationException - always