org.tio.utils.collection

Class IntObjectHashMap<V>

java.lang.Object

org.tio.utils.collection.IntObjectHashMap<V>

Type Parameters:

V - The value type stored in the map.

All Implemented Interfaces:

Map<Integer,V>, IntObjectMap<V>

public class IntObjectHashMap<V>
extends Object
implements IntObjectMap<V>

A hash map implementation of IntObjectMap that uses open addressing for keys. To minimize the memory footprint, this class uses open addressing rather than chaining. Collisions are resolved using linear probing. Deletions implement compaction, so cost of remove can approach O(N) for full maps, which makes a small loadFactor recommended.

Author:

netty

Nested Class Summary

Nested classes/interfaces inherited from interface org.tio.utils.collection.IntObjectMap

IntObjectMap.PrimitiveEntry<V>

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

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_CAPACITY Default initial capacity.
static float	DEFAULT_LOAD_FACTOR Default load factor.

Constructor Summary

Constructors

Constructor and Description
IntObjectHashMap()
IntObjectHashMap(int initialCapacity)
IntObjectHashMap(int initialCapacity, float loadFactor)

Method Summary

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(int key) Indicates whether or not this map contains a value for the specified key.
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Iterable<IntObjectMap.PrimitiveEntry<V>>	entries() Gets an iterable to traverse over the primitive entries contained in this map.
Set<Map.Entry<Integer,V>>	entrySet()
boolean	equals(Object obj)
V	get(int key) Gets the value in the map with the specified key.
V	get(Object key)
int	hashCode()
boolean	isEmpty()
Set<Integer>	keySet()
protected String	keyToString(int key) Helper method called by toString() in order to convert a single map key into a string.
V	put(Integer key, V value)
V	put(int key, V value) Puts the given entry into the map.
void	putAll(Map<? extends Integer,? extends V> sourceMap)
V	remove(int key) Removes the entry with the specified key.
V	remove(Object key)
int	size()
String	toString()
Collection<V>	values()

Methods inherited from class java.lang.Object

clone, 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

Field Detail

DEFAULT_CAPACITY

public static final int DEFAULT_CAPACITY

Default initial capacity. Used if not specified in the constructor

See Also:

Constant Field Values

DEFAULT_LOAD_FACTOR

public static final float DEFAULT_LOAD_FACTOR

Default load factor. Used if not specified in the constructor

See Also:

Constant Field Values

Constructor Detail

IntObjectHashMap

public IntObjectHashMap()

IntObjectHashMap

public IntObjectHashMap(int initialCapacity)

IntObjectHashMap

public IntObjectHashMap(int initialCapacity,
                        float loadFactor)

Method Detail

get

public V get(int key)

Description copied from interface: IntObjectMap

Gets the value in the map with the specified key.

Specified by:

get in interface IntObjectMap<V>

Parameters:

key - the key whose associated value is to be returned.

Returns:

the value or null if the key was not found in the map.

put

public V put(int key,
             V value)

Description copied from interface: IntObjectMap

Puts the given entry into the map.

Specified by:

put in interface IntObjectMap<V>

Parameters:

key - the key of the entry.

value - the value of the entry.

Returns:

the previous value for this key or null if there was no previous mapping.

putAll

public void putAll(Map<? extends Integer,? extends V> sourceMap)

Specified by:

putAll in interface Map<Integer,V>

remove

public V remove(int key)

Description copied from interface: IntObjectMap

Removes the entry with the specified key.

Specified by:

remove in interface IntObjectMap<V>

Parameters:

key - the key for the entry to be removed from this map.

Returns:

the previous value for the key, or null if there was no mapping.

size

public int size()

Specified by:

size in interface Map<Integer,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<Integer,V>

clear

public void clear()

Specified by:

clear in interface Map<Integer,V>

containsKey

public boolean containsKey(int key)

Description copied from interface: IntObjectMap

Indicates whether or not this map contains a value for the specified key.

Specified by:

containsKey in interface IntObjectMap<V>

Parameters:

key - key

Returns:

is has key

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<Integer,V>

entries

public Iterable<IntObjectMap.PrimitiveEntry<V>> entries()

Description copied from interface: IntObjectMap

Gets an iterable to traverse over the primitive entries contained in this map. As an optimization, the IntObjectMap.PrimitiveEntrys returned by the Iterator may change as the Iterator progresses. The caller should not rely on IntObjectMap.PrimitiveEntry key/value stability.

Specified by:

entries in interface IntObjectMap<V>

Returns:

entries

values

public Collection<V> values()

Specified by:

values in interface Map<Integer,V>

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<Integer,V>

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Specified by:

equals in interface Map<Integer,V>

Overrides:

equals in class Object

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<Integer,V>

get

public V get(Object key)

Specified by:

get in interface Map<Integer,V>

put

public V put(Integer key,
             V value)

Specified by:

put in interface Map<Integer,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<Integer,V>

keySet

public Set<Integer> keySet()

Specified by:

keySet in interface Map<Integer,V>

entrySet

public Set<Map.Entry<Integer,V>> entrySet()

Specified by:

entrySet in interface Map<Integer,V>

toString

public String toString()

Overrides:

toString in class Object

keyToString

protected String keyToString(int key)

Helper method called by toString() in order to convert a single map key into a string. This is protected to allow subclasses to override the appearance of a given key.

Parameters:

key - key

Returns:

key String