com.google.common.collect

Class HashBiMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

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

All Implemented Interfaces:

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

@GwtCompatible(emulated=true)
public final class HashBiMap<K,V>
extends AbstractMap<K,V>
implements BiMap<K,V>, Serializable

A BiMap backed by two hash tables. This implementation allows null keys and values. A HashBiMap and its inverse are both serializable.

See the Guava User Guide article on BiMap .

Since:

2.0 (imported from Google Collections Library)

Author:

Louis Wasserman, Mike Bostock

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

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

Map.Entry<K,V>

Method Summary

Methods

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
static <K,V> HashBiMap<K,V>	create() Returns a new, empty HashBiMap with the default initial capacity (16).
static <K,V> HashBiMap<K,V>	create(int expectedSize) Constructs a new, empty bimap with the specified expected size.
static <K,V> HashBiMap<K,V>	create(Map<? extends K,? extends V> map) Constructs a new bimap containing initial values from map.
Set<Map.Entry<K,V>>	entrySet()
V	forcePut(K key, V value) An alternate form of put that silently removes any existing entry with the value value before proceeding with the BiMap.put(K, V) operation.
V	get(Object key)
BiMap<V,K>	inverse() Returns the inverse view of this bimap, which maps each of this bimap's values to its associated key.
Set<K>	keySet()
V	put(K key, V value)
V	remove(Object key)
int	size()
Set<V>	values()

Methods inherited from class java.util.AbstractMap

clone, equals, hashCode, isEmpty, putAll, toString

Methods inherited from class java.lang.Object

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

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

putAll

Methods inherited from interface java.util.Map

equals, hashCode, isEmpty

Method Detail

create

public static <K,V> HashBiMap<K,V> create()

Returns a new, empty HashBiMap with the default initial capacity (16).

create

public static <K,V> HashBiMap<K,V> create(int expectedSize)

Constructs a new, empty bimap with the specified expected size.

Parameters:

expectedSize - the expected number of entries

Throws:

IllegalArgumentException - if the specified expected size is negative

create

public static <K,V> HashBiMap<K,V> create(Map<? extends K,? extends V> map)

Constructs a new bimap containing initial values from map. The bimap is created with an initial capacity sufficient to hold the mappings in the specified map.

containsKey

public boolean containsKey(@Nullable
                  Object key)

Specified by:

containsKey in interface Map<K,V>

Overrides:

containsKey in class AbstractMap<K,V>

containsValue

public boolean containsValue(@Nullable
                    Object value)

Specified by:

containsValue in interface Map<K,V>

Overrides:

containsValue in class AbstractMap<K,V>

get

@Nullable
public V get(@Nullable
             Object key)

Specified by:

get in interface Map<K,V>

Overrides:

get in class AbstractMap<K,V>

put

public V put(@Nullable
    K key,
    @Nullable
    V value)

Description copied from interface: BiMap

Specified by:

put in interface BiMap<K,V>

Specified by:

put in interface Map<K,V>

Overrides:

put in class AbstractMap<K,V>

forcePut

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

Description copied from interface: BiMap

An alternate form of put that silently removes any existing entry with the value value before proceeding with the BiMap.put(K, V) operation. If the bimap previously contained the provided key-value mapping, this method has no effect.

Note that a successful call to this method could cause the size of the bimap to increase by one, stay the same, or even decrease by one.

Warning: If an existing entry with this value is removed, the key for that entry is discarded and not returned.

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

remove

public V remove(@Nullable
       Object key)

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class AbstractMap<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

Overrides:

clear in class AbstractMap<K,V>

size

public int size()

Specified by:

size in interface Map<K,V>

Overrides:

size in class AbstractMap<K,V>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

Overrides:

keySet in class AbstractMap<K,V>

values

public Set<V> values()

Description copied from interface: BiMap

Because a bimap has unique values, this method returns a Set, instead of the Collection specified in the Map interface.

Specified by:

values in interface BiMap<K,V>

Specified by:

values in interface Map<K,V>

Overrides:

values in class AbstractMap<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

Specified by:

entrySet in class AbstractMap<K,V>

inverse

public BiMap<V,K> inverse()

Description copied from interface: BiMap

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.

Specified by:

inverse in interface BiMap<K,V>

Returns:

the inverse view of this bimap