Package org.optaplanner.core.impl.util

Class FieldBasedScalingMap<K,V>

java.lang.Object

org.optaplanner.core.impl.util.FieldBasedScalingMap<K,V>

All Implemented Interfaces:

Map<K,V>

public final class FieldBasedScalingMap<K,V>
extends Object
implements Map<K,V>

Uses a given Map as storage unless it is the first and only entry, in which case it uses fields. This helps avoid the overhead of creating and accessing a hash map if we only have 1 entry. This implementation is not thread-safe, regardless of the underlying Map. Iteration order of elements is specified by the underlying Map.

Nested Class Summary

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

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

Constructor Summary

Constructors

Constructor	Description
FieldBasedScalingMap(Supplier<Map<K,V>> mapSupplier)

Method Summary

Modifier and Type	Method	Description
void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set<Map.Entry<K,V>>	entrySet()	As defined by Map.entrySet().
void	forEach(BiConsumer<? super K,? super V> action)
V	get(Object key)
boolean	isEmpty()
Set<K>	keySet()	As defined by Map.keySet().
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> m)
V	remove(Object key)
int	size()
String	toString()
Collection<V>	values()	As defined by Map.values().

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Detail

FieldBasedScalingMap

public FieldBasedScalingMap(Supplier<Map<K,V>> mapSupplier)

Method Detail

put

public V put(K key,
             V value)

Specified by:

put in interface Map<K,V>

putAll

public void putAll(Map<? extends K,? extends V> m)

Specified by:

putAll in interface Map<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

keySet

public Set<K> keySet()

As defined by Map.keySet(). May throw an exception if the iterator is used to remove an element while the map is based on a field.

Specified by:

keySet in interface Map<K,V>

Returns:

never null

values

public Collection<V> values()

As defined by Map.values(). May throw an exception if the iterator is used to remove an element while the map is based on a field.

Specified by:

values in interface Map<K,V>

Returns:

never null

entrySet

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

As defined by Map.entrySet(). May throw an exception if the iterator is used to remove an element while the map is based on a field.

Specified by:

entrySet in interface Map<K,V>

Returns:

never null

forEach

public void forEach(BiConsumer<? super K,? super V> action)

Specified by:

forEach in interface Map<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

size

public int size()

Specified by:

size in interface Map<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

toString

public String toString()

Overrides:

toString in class Object