Package io.deephaven.base

Class LowGarbageArrayIntegerMap<T>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<Integer,T>

io.deephaven.base.LowGarbageArrayIntegerMap<T>

All Implemented Interfaces:

Serializable, Cloneable, Map<Integer,T>

public class LowGarbageArrayIntegerMap<T>
extends HashMap<Integer,T>

A very simple Map for small maps with Integer keys (uses direct array access) that creates no garbage (except when expanding). This set only has one Iterator, which is reused. This set is not thread safe.

Note: This class extends HashMap rather than Map (or AbstractMap) only because one of the fields where we want to use it (sun.nio.ch.EPollSelectorImpl#fdToKey) is (improperly) declared as a HashMap rather than a Map.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>

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

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
LowGarbageArrayIntegerMap()

Method Summary

Modifier and Type	Method	Description
void	clear()
Object	clone()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set<Map.Entry<Integer,T>>	entrySet()
T	get(Object key)
boolean	isEmpty()
Set<Integer>	keySet()
T	put(Integer key, T value)
void	putAll(Map<? extends Integer,? extends T> m)
T	remove(Object key)
int	size()
Collection<T>	values()

Methods inherited from class java.util.HashMap

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

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Details

LowGarbageArrayIntegerMap

public LowGarbageArrayIntegerMap()

Method Details

get

public T get(Object key)

Specified by:

get in interface Map<Integer,T>

Overrides:

get in class HashMap<Integer,T>

put

public T put(Integer key,
 T value)

Specified by:

put in interface Map<Integer,T>

Overrides:

put in class HashMap<Integer,T>

remove

public T remove(Object key)

Specified by:

remove in interface Map<Integer,T>

Overrides:

remove in class HashMap<Integer,T>

size

public int size()

Specified by:

size in interface Map<Integer,T>

Overrides:

size in class HashMap<Integer,T>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<Integer,T>

Overrides:

isEmpty in class HashMap<Integer,T>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<Integer,T>

Overrides:

containsKey in class HashMap<Integer,T>

putAll

public void putAll(Map<? extends Integer,? extends T> m)

Specified by:

putAll in interface Map<Integer,T>

Overrides:

putAll in class HashMap<Integer,T>

clear

public void clear()

Specified by:

clear in interface Map<Integer,T>

Overrides:

clear in class HashMap<Integer,T>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<Integer,T>

Overrides:

containsValue in class HashMap<Integer,T>

clone

public Object clone()

Overrides:

clone in class HashMap<Integer,T>

keySet

public Set<Integer> keySet()

Specified by:

keySet in interface Map<Integer,T>

Overrides:

keySet in class HashMap<Integer,T>

values

public Collection<T> values()

Specified by:

values in interface Map<Integer,T>

Overrides:

values in class HashMap<Integer,T>

entrySet

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

Specified by:

entrySet in interface Map<Integer,T>

Overrides:

entrySet in class HashMap<Integer,T>