Package org.infinispan.commons.util

Class HopscotchHashMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

org.infinispan.commons.util.ArrayMap<K,V>

org.infinispan.commons.util.HopscotchHashMap<K,V>

All Implemented Interfaces:

Map<K,V>

public class HopscotchHashMap<K,V>
extends ArrayMap<K,V>

Lookup on a table without collisions will require only single access, if there are collisions it will be limited to (number of collisions to particular bin + 1) and all those will lie in proximity (32 * reference size). Inserts can be O(n) in the worst case when we have to rehash whole table or search through close-to-full for an empty spot.

Not thread safe (though, look-ups are safe when there are no concurrent modifications).

See Also:

• Hopscotch hashing

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>

Field Summary

Fields inherited from class org.infinispan.commons.util.ArrayMap

keys, modCount, size, values

Constructor Summary

Constructors

Constructor	Description
HopscotchHashMap(int initialCapacity)

Method Summary

Modifier and Type	Method	Description
V	get(Object key)
V	put(K key, V value)
V	remove(Object key)

Methods inherited from class org.infinispan.commons.util.ArrayMap

clear, containsKey, containsValue, entrySet, keySet, size, 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 java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Details

HopscotchHashMap

public HopscotchHashMap(int initialCapacity)

Method Details

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

Specified by:

get in class ArrayMap<K,V>

put

public V put(K key,
 V value)

Specified by:

put in interface Map<K,V>

Specified by:

put in class ArrayMap<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

Specified by:

remove in class ArrayMap<K,V>