IdentityObjectIntMap

java.lang.Object
- com.esotericsoftware.kryo.util.IdentityObjectIntMap<K>

```
public class IdentityObjectIntMap<K>
extends java.lang.Object
```
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.

Field Summary

Fields
Modifier and Type	Field and Description
`(package private) int`	`capacity`
`private int`	`hashShift`
`(package private) K[]`	`keyTable`
`private float`	`loadFactor`
`private int`	`mask`
`private static int`	`PRIME1`
`private static int`	`PRIME2`
`private static int`	`PRIME3`
`private int`	`pushIterations`
`int`	`size`
`private int`	`stashCapacity`
`(package private) int`	`stashSize`
`private int`	`threshold`
`(package private) int[]`	`valueTable`

Constructor Summary

Constructors
Constructor and Description
`IdentityObjectIntMap()` Creates 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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`clear()`
`void`	`clear(int maximumCapacity)` Clears the map and reduces the size of the backing arrays to be the specified capacity if they are larger.
`boolean`	`containsKey(K key)`
`private boolean`	`containsKeyStash(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.
`K`	`findKey(int value)` Returns the key for the specified value, or null if it is not in the map.
`int`	`get(K key, int defaultValue)`
`int`	`getAndIncrement(K key, int defaultValue, int increment)` Returns the key's current value and increments the stored value.
`private int`	`getAndIncrementStash(K key, int defaultValue, int increment)`
`private int`	`getStash(K key, int defaultValue)`
`private int`	`hash2(int h)`
`private int`	`hash3(int h)`
`private void`	`push(K insertKey, int insertValue, int index1, K key1, int index2, K key2, int index3, K key3)`
`void`	`put(K key, int value)`
`private void`	`putResize(K key, int value)` Skips checks for existing keys.
`private void`	`putStash(K key, int value)`
`int`	`remove(K key, int defaultValue)`
`(package private) int`	`removeStash(K key, int defaultValue)`
`(package private) void`	`removeStashIndex(int index)`
`private void`	`resize(int newSize)`
`void`	`shrink(int maximumCapacity)` Reduces the size of the backing arrays to be the specified capacity or less.
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - PRIME1
```
private static final int PRIME1
```
    See Also:
    
    Constant Field Values
  - PRIME2
```
private static final int PRIME2
```
    See Also:
    
    Constant Field Values
  - PRIME3
```
private static final int PRIME3
```
    See Also:
    
    Constant Field Values
  - size
```
public int size
```
  - keyTable
```
K[] keyTable
```
  - valueTable
```
int[] valueTable
```
  - capacity
```
int capacity
```
  - stashSize
```
int stashSize
```
  - loadFactor
```
private float loadFactor
```
  - hashShift
```
private int hashShift
```
  - mask
```
private int mask
```
  - threshold
```
private int threshold
```
  - stashCapacity
```
private int stashCapacity
```
  - pushIterations
```
private int pushIterations
```
- Constructor Detail
  - 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.
- Method Detail
  - put
```
public void put(K key,
                int value)
```
  - putResize
```
private void putResize(K key,
                       int value)
```
    Skips checks for existing keys.
  - push
```
private void push(K insertKey,
                  int insertValue,
                  int index1,
                  K key1,
                  int index2,
                  K key2,
                  int index3,
                  K key3)
```
  - putStash
```
private void putStash(K key,
                      int value)
```
  - get
```
public int get(K key,
               int defaultValue)
```
    Parameters:
    
    defaultValue - Returned if the key was not associated with a value.
  - getStash
```
private int getStash(K key,
                     int defaultValue)
```
  - getAndIncrement
```
public int getAndIncrement(K key,
                           int defaultValue,
                           int increment)
```
    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.
  - getAndIncrementStash
```
private int getAndIncrementStash(K key,
                                 int defaultValue,
                                 int increment)
```
  - remove
```
public int remove(K key,
                  int defaultValue)
```
  - removeStash
```
int removeStash(K key,
                int defaultValue)
```
  - removeStashIndex
```
void removeStashIndex(int index)
```
  - shrink
```
public void shrink(int maximumCapacity)
```
    Reduces the size of the backing arrays to be the specified capacity or less. If the capacity is already less, nothing is done. If the map contains more items than the specified capacity, nothing is done.
  - clear
```
public void clear(int maximumCapacity)
```
    Clears the map and reduces the size of the backing arrays to be the specified capacity if they are larger.
  - 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
```
public boolean containsKey(K key)
```
  - containsKeyStash
```
private boolean containsKeyStash(K key)
```
  - findKey
```
public K findKey(int value)
```
    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.
  - resize
```
private void resize(int newSize)
```
  - hash2
```
private int hash2(int h)
```
  - hash3
```
private int hash3(int h)
```
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object

Class IdentityObjectIntMap<K>

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

PRIME1

PRIME2

PRIME3

size

keyTable

valueTable

capacity

stashSize

loadFactor

hashShift

mask

threshold

stashCapacity

pushIterations

Constructor Detail

IdentityObjectIntMap

IdentityObjectIntMap

IdentityObjectIntMap

Method Detail

put

putResize

push

putStash

get

getStash

getAndIncrement

getAndIncrementStash

remove

removeStash

removeStashIndex

shrink

clear

clear

containsValue

containsKey

containsKeyStash

findKey

ensureCapacity

resize

hash2

hash3

toString