Package com.esotericsoftware.kryo.util
Class IdentityObjectIntMap<K>
java.lang.Object
com.esotericsoftware.kryo.util.IdentityObjectIntMap<K>
An unordered map where identity comparison is used for keys and the values are ints. This implementation is a cuckoo hash map
using 3 hashes, random walking, and a small stash for problematic keys. Null keys are not allowed. No allocation is done except
when growing the table size.
This map performs very fast get, containsKey, and remove (typically O(1), worst case O(log(n))). Put may be a bit slower, depending on hash collisions. Load factors greater than 0.91 greatly increase the chances the map will have to rehash to the next higher POT size.
This map performs very fast get, containsKey, and remove (typically O(1), worst case O(log(n))). Put may be a bit slower, depending on hash collisions. Load factors greater than 0.91 greatly increase the chances the map will have to rehash to the next higher POT size.
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Field Summary
Fields -
Constructor Summary
ConstructorsConstructorDescriptionCreates a new map with an initial capacity of 32 and a load factor of 0.8.IdentityObjectIntMap
(int initialCapacity) Creates a new map with a load factor of 0.8.IdentityObjectIntMap
(int initialCapacity, float loadFactor) Creates a new map with the specified initial capacity and load factor. -
Method Summary
Modifier and TypeMethodDescriptionvoid
clear()
boolean
containsKey
(K key) boolean
containsValue
(int value) Returns true if the specified value is in the map.void
ensureCapacity
(int additionalCapacity) Increases the size of the backing array to acommodate the specified number of additional items.findKey
(int value) Returns the key for the specified value, or null if it is not in the map.int
int
getAndIncrement
(K key, int defaultValue, int increment) Returns the key's current value and increments the stored value.void
int
toString()
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Field Details
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size
public int size
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Constructor Details
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IdentityObjectIntMap
public IdentityObjectIntMap()Creates a new map with an initial capacity of 32 and a load factor of 0.8. This map will hold 25 items before growing the backing table. -
IdentityObjectIntMap
public IdentityObjectIntMap(int initialCapacity) Creates a new map with a load factor of 0.8. This map will hold initialCapacity * 0.8 items before growing the backing table. -
IdentityObjectIntMap
public IdentityObjectIntMap(int initialCapacity, float loadFactor) Creates a new map with the specified initial capacity and load factor. This map will hold initialCapacity * loadFactor items before growing the backing table.
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Method Details
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put
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get
- Parameters:
defaultValue
- Returned if the key was not associated with a value.
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getAndIncrement
Returns the key's current value and increments the stored value. If the key is not in the map, defaultValue + increment is put into the map. -
remove
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clear
public void clear() -
containsValue
public boolean containsValue(int value) Returns true if the specified value is in the map. Note this traverses the entire map and compares every value, which may be an expensive operation. -
containsKey
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findKey
Returns the key for the specified value, or null if it is not in the map. Note this traverses the entire map and compares every value, which may be an expensive operation. -
ensureCapacity
public void ensureCapacity(int additionalCapacity) Increases the size of the backing array to acommodate the specified number of additional items. Useful before adding many items to avoid multiple backing array resizes. -
toString
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