Class DualHashBidiMap<K,V>
java.lang.Object
org.apache.commons.collections4.bidimap.AbstractDualBidiMap<K,V>
org.apache.commons.collections4.bidimap.DualHashBidiMap<K,V>
- Type Parameters:
K- the type of the keys in the mapV- the type of the values in the map
- All Implemented Interfaces:
Serializable,Map<K,,V> BidiMap<K,,V> Get<K,,V> IterableGet<K,,V> IterableMap<K,,V> Put<K,V>
Implements
BidiMap with two HashMap instances.
Two HashMap instances are used in this class.
This provides fast lookups at the expense of storing two sets of map entries.
Commons Collections would welcome the addition of a direct hash-based
implementation of the BidiMap interface.
NOTE: From Commons Collections 3.1, all subclasses will use HashMap
and the flawed createMap method is ignored.
- Since:
- 3.0
- See Also:
-
Nested Class Summary
Nested classes/interfaces inherited from class org.apache.commons.collections4.bidimap.AbstractDualBidiMap
AbstractDualBidiMap.BidiMapIterator<K,V>, AbstractDualBidiMap.EntrySet<K, V>, AbstractDualBidiMap.EntrySetIterator<K, V>, AbstractDualBidiMap.KeySet<K>, AbstractDualBidiMap.KeySetIterator<K>, AbstractDualBidiMap.MapEntry<K, V>, AbstractDualBidiMap.Values<V>, AbstractDualBidiMap.ValuesIterator<V>, AbstractDualBidiMap.View<K, V, E> -
Constructor Summary
ConstructorsModifierConstructorDescriptionCreates an emptyHashBidiMap.DualHashBidiMap(Map<? extends K, ? extends V> map) Constructs aHashBidiMapand copies the mappings from specifiedMap.protectedConstructs aHashBidiMapthat decorates the specified maps. -
Method Summary
Methods inherited from class org.apache.commons.collections4.bidimap.AbstractDualBidiMap
clear, containsKey, containsValue, createEntrySetIterator, createKeySetIterator, createValuesIterator, entrySet, equals, get, getKey, hashCode, inverseBidiMap, isEmpty, keySet, mapIterator, put, putAll, remove, removeValue, size, toString, valuesMethods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, waitMethods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll
-
Constructor Details
-
DualHashBidiMap
public DualHashBidiMap()Creates an emptyHashBidiMap. -
DualHashBidiMap
Constructs aHashBidiMapand copies the mappings from specifiedMap.- Parameters:
map- the map whose mappings are to be placed in this map
-
DualHashBidiMap
-
-
Method Details
-
createBidiMap
protected BidiMap<V,K> createBidiMap(Map<V, K> normalMap, Map<K, V> reverseMap, BidiMap<K, V> inverseBidiMap) Creates a new instance of this object.- Specified by:
createBidiMapin classAbstractDualBidiMap<K,V> - Parameters:
normalMap- the normal direction mapreverseMap- the reverse direction mapinverseBidiMap- the inverse BidiMap- Returns:
- new bidi map
-