Class EnumHashBiMap<K extends Enum<K>, V extends @Nullable Object>

java.lang.Object

com.google.common.collect.ForwardingObject

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

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

All Implemented Interfaces:

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

@GwtCompatible
public final class EnumHashBiMap<K extends Enum<K>, V extends @Nullable Object>
extends ForwardingMap<K,V>

A BiMap backed by an EnumMap instance for keys-to-values, and a HashMap instance for values-to-keys. Null keys are not permitted, but null values are. An EnumHashBiMap and its inverse are both serializable.

See the Guava User Guide article on BiMap.

Since:

2.0

Author:

Mike Bostock

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.google.common.collect.ForwardingMap

ForwardingMap.StandardEntrySet, ForwardingMap.StandardKeySet, ForwardingMap.StandardValues

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

Map.Entry<K,V>

Method Summary

Modifier and Type	Method	Description
void	clear()
boolean	containsValue(@Nullable Object value)
static <K extends Enum<K>, V extends @Nullable Object> EnumHashBiMap<K,V>	create(Class<K> keyType)	Returns a new, empty EnumHashBiMap using the specified key type.
static <K extends Enum<K>, V extends @Nullable Object> EnumHashBiMap<K,V>	create(Map<K, ? extends V> map)	Constructs a new bimap with the same mappings as the specified map.
protected Map<K,V>	delegate()	Returns the backing delegate instance that methods are forwarded to.
Set<Map.Entry<K,V>>	entrySet()
@Nullable 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.
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()
Class<K>	keyType()	Returns the associated key type.
@Nullable V	put(K key, V value)
void	putAll(Map<? extends K, ? extends V> map)
V	remove(@Nullable Object key)
Set<V>	values()

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

containsKey, equals, get, hashCode, isEmpty, size, standardClear, standardContainsKey, standardContainsValue, standardEquals, standardHashCode, standardIsEmpty, standardPutAll, standardRemove, standardToString

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

toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, containsKey, equals, forEach, get, getOrDefault, hashCode, isEmpty, merge, putIfAbsent, remove, replace, replace, replaceAll, size

Method Details

create

public static <K extends Enum<K>, V extends @Nullable Object>
EnumHashBiMap<K,V> create(Class<K> keyType)

Returns a new, empty EnumHashBiMap using the specified key type.

Parameters:

keyType - the key type

create

public static <K extends Enum<K>, V extends @Nullable Object>
EnumHashBiMap<K,V> create(Map<K, ? extends V> map)

Constructs a new bimap with the same mappings as the specified map. If the specified map is an EnumHashBiMap or an EnumBiMap, the new bimap has the same key type as the input bimap. Otherwise, the specified map must contain at least one mapping, in order to determine the key type.

Parameters:

map - the map whose mappings are to be placed in this map

Throws:

IllegalArgumentException - if map is not an EnumBiMap or an EnumHashBiMap instance and contains no mappings

put

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

Description copied from interface: BiMap

Specified by:

put in interface BiMap<K extends Enum<K>, V extends @Nullable Object>

Specified by:

put in interface Map<K extends Enum<K>, V extends @Nullable Object>

forcePut

@CanIgnoreReturnValue
public @Nullable V forcePut(K key,
 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 extends Enum<K>, V extends @Nullable Object>

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 that was previously associated with the key, or null if there was no previous entry. (If the bimap contains null values, then forcePut, like put, returns null both if the key is absent and if it is present with a null value.)

keyType

@GwtIncompatible
public Class<K> keyType()

Returns the associated key type.

delegate

protected Map<K,V> delegate()

Description copied from class: ForwardingObject

Returns the backing delegate instance that methods are forwarded to. Abstract subclasses generally override this method with an abstract method that has a more specific return type, such as ForwardingSet.delegate(). Concrete subclasses override this method to supply the instance being decorated.

Specified by:

delegate in class ForwardingMap<K extends @Nullable Object, V extends @Nullable Object>

containsValue

public boolean containsValue(@Nullable Object value)

Specified by:

containsValue in interface Map<K extends @Nullable Object, V extends @Nullable Object>

Overrides:

containsValue in class ForwardingMap<K extends @Nullable Object, V extends @Nullable Object>

remove

@CanIgnoreReturnValue
public V remove(@Nullable Object key)

Specified by:

remove in interface Map<K extends @Nullable Object, V extends @Nullable Object>

Overrides:

remove in class ForwardingMap<K extends @Nullable Object, V extends @Nullable Object>

putAll

public void putAll(Map<? extends K, ? extends V> map)

Description copied from interface: BiMap

Warning: the results of calling this method may vary depending on the iteration order of map.

Specified by:

putAll in interface BiMap<K extends @Nullable Object, V extends @Nullable Object>

Specified by:

putAll in interface Map<K extends @Nullable Object, V extends @Nullable Object>

Overrides:

putAll in class ForwardingMap<K extends @Nullable Object, V extends @Nullable Object>

clear

public void clear()

Specified by:

clear in interface Map<K extends @Nullable Object, V extends @Nullable Object>

Overrides:

clear in class ForwardingMap<K extends @Nullable Object, V extends @Nullable Object>

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 extends @Nullable Object, V extends @Nullable Object>

Returns:

the inverse view of this bimap

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K extends @Nullable Object, V extends @Nullable Object>

Overrides:

keySet in class ForwardingMap<K extends @Nullable Object, V extends @Nullable Object>

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 extends @Nullable Object, V extends @Nullable Object>

Specified by:

values in interface Map<K extends @Nullable Object, V extends @Nullable Object>

Overrides:

values in class ForwardingMap<K extends @Nullable Object, V extends @Nullable Object>

entrySet

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

Specified by:

entrySet in interface Map<K extends @Nullable Object, V extends @Nullable Object>

Overrides:

entrySet in class ForwardingMap<K extends @Nullable Object, V extends @Nullable Object>