程序包 cn.taketoday.util

类 MapCache<Key,Value,Param>

java.lang.Object

cn.taketoday.util.MapCache<Key,Value,Param>

类型参数:

Key - key type

Param - param type, extra computing param type

Value - value type

public class MapCache<Key,Value,Param>
extends Object

Map cache

从以下版本开始:

3.0

作者:

TODAY 2021/1/27 23:02

字段概要

字段

修饰符和类型	字段	说明
private final Map<Key,Value>	mapping
private final Function<Key,Value>	mappingFunction	default mapping function

构造器概要

构造器

构造器	说明
MapCache()
MapCache(int initialCapacity)
MapCache(Function<Key,Value> mappingFunction)
MapCache(Map<Key,Value> mapping)
MapCache(Map<Key,Value> mapping, Function<Key,Value> mappingFunction)

方法概要

修饰符和类型	方法	说明
void	clear()
protected Value	createValue(Key key, Param param)
final Value	get(Key key)	If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.
final Value	get(Key key, Function<Key,Value> mappingFunction)	If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.
final Value	get(Key key, Param param)	If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.
Value	put(Key key, Value value)
Value	remove(Key key)

从类继承的方法 java.lang.Object

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

字段详细资料

mapping

private final Map<Key,Value> mapping

mappingFunction

@Nullable
private final Function<Key,Value> mappingFunction

default mapping function

构造器详细资料

MapCache

public MapCache()

MapCache

public MapCache(int initialCapacity)

MapCache

public MapCache(Map<Key,Value> mapping)

参数:

mapping - allows to define your own map implementation

MapCache

public MapCache(Function<Key,Value> mappingFunction)

MapCache

public MapCache(Map<Key,Value> mapping,
 @Nullable
 Function<Key,Value> mappingFunction)

参数:

mapping - allows to define your own map implementation

方法详细资料

get

public final Value get(Key key,
 Param param)

If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.

High performance way

参数:

key - key with which the specified value is to be associated

param - createValue's param

返回:

the current (existing or computed) value associated with the specified key, or null if the computed value is null

另请参阅:

• createValue(Key, Param)

get

public final Value get(Key key)

If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.

参数:

key - key with which the specified value is to be associated

返回:

the current (existing or computed) value associated with the specified key, or null if the computed value is null

get

public final Value get(Key key,
 @Nullable
 Function<Key,Value> mappingFunction)

If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.

参数:

key - key with which the specified value is to be associated

mappingFunction - the function to compute a value, can be null, if its null use default mappingFunction

返回:

the current (existing or computed) value associated with the specified key, or null if the computed value is null

createValue

protected Value createValue(Key key,
 Param param)

put

public Value put(Key key,
 Value value)

clear

public void clear()

remove

public Value remove(Key key)