org.elasticsearch.util.collect
Class HashBiMap<K,V>

java.lang.Object
  org.elasticsearch.util.collect.ForwardingObject
      org.elasticsearch.util.collect.ForwardingMap<K,V>
          org.elasticsearch.util.collect.HashBiMap<K,V>

All Implemented Interfaces:

java.io.Serializable, java.util.Map<K,V>, BiMap<K,V>

public final class HashBiMap<K,V>
extends ForwardingMap<K,V>

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

See Also:

Serialized Form

Nested Class Summary

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

java.util.Map.Entry<K,V>

Method Summary

void	clear()
boolean	containsValue(java.lang.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(java.util.Map<? extends K,? extends V> map) Constructs a new bimap containing initial values from map.
protected java.util.Map<K,V>	delegate() Returns the backing delegate instance that methods are forwarded to.
java.util.Set<java.util.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.
BiMap<V,K>	inverse() Returns the inverse view of this bimap, which maps each of this bimap's values to its associated key.
java.util.Set<K>	keySet()
V	put(K key, V value)
void	putAll(java.util.Map<? extends K,? extends V> map)
V	remove(java.lang.Object key)
java.util.Set<V>	values()

Methods inherited from class org.elasticsearch.util.collect.ForwardingMap

containsKey, equals, get, hashCode, isEmpty, size

Methods inherited from class org.elasticsearch.util.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

containsKey, equals, get, hashCode, isEmpty, size

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:

java.lang.IllegalArgumentException - if the specified expected size is negative

create

public static <K,V> HashBiMap<K,V> create(java.util.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.

put

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

Description copied from interface: BiMap

Specified by:

put in interface java.util.Map<K,V>

Specified by:

put in interface BiMap<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

delegate

protected java.util.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,V>

containsValue

public boolean containsValue(java.lang.Object value)

Specified by:

containsValue in interface java.util.Map<K,V>

Overrides:

containsValue in class ForwardingMap<K,V>

remove

public V remove(java.lang.Object key)

Specified by:

remove in interface java.util.Map<K,V>

Overrides:

remove in class ForwardingMap<K,V>

putAll

public void putAll(java.util.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 java.util.Map<K,V>

Specified by:

putAll in interface BiMap<K,V>

Overrides:

putAll in class ForwardingMap<K,V>

clear

public void clear()

Specified by:

clear in interface java.util.Map<K,V>

Overrides:

clear in class ForwardingMap<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

keySet

public java.util.Set<K> keySet()

Specified by:

keySet in interface java.util.Map<K,V>

Overrides:

keySet in class ForwardingMap<K,V>

values

public java.util.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 java.util.Map<K,V>

Specified by:

values in interface BiMap<K,V>

Overrides:

values in class ForwardingMap<K,V>

entrySet

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

Specified by:

entrySet in interface java.util.Map<K,V>

Overrides:

entrySet in class ForwardingMap<K,V>