com.alibaba.nacos.common.utils

类 MapUtil

java.lang.Object

com.alibaba.nacos.common.utils.MapUtil

public class MapUtil
extends Object

Map utils.

作者:

liaochuntao

方法概要

限定符和类型	方法和说明
static <K,C,V,T> V	computeIfAbsent(Map<K,V> target, K key, BiFunction<C,T,V> mappingFunction, C param1, T param2) ComputeIfAbsent lazy load.
static boolean	isEmpty(Dictionary coll) Null-safe check if the specified Dictionary is empty.
static boolean	isEmpty(Map map) Null-safe check if the specified Dictionary is empty.
static boolean	isNotEmpty(Dictionary coll) Null-safe check if the specified Dictionary is not empty.
static boolean	isNotEmpty(Map map) Null-safe check if the specified Dictionary is not empty.
static void	putIfValNoEmpty(Map target, Object key, Object value) Put into map if value is not empty.
static void	putIfValNoNull(Map target, Object key, Object value) Put into map if value is not null.
static <K,V> V	removeKey(Map<K,V> map, K key, Predicate<V> removeJudge) remove value, Thread safety depends on whether the Map is a thread-safe Map.

从类继承的方法 java.lang.Object

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

方法详细资料

isEmpty

public static boolean isEmpty(Map map)

Null-safe check if the specified Dictionary is empty.

Null returns true.

参数:

map - the collection to check, may be null

返回:

true if empty or null

isEmpty

public static boolean isEmpty(Dictionary coll)

Null-safe check if the specified Dictionary is empty.

Null returns true.

参数:

coll - the collection to check, may be null

返回:

true if empty or null

isNotEmpty

public static boolean isNotEmpty(Map map)

Null-safe check if the specified Dictionary is not empty.

Null returns false.

参数:

map - the collection to check, may be null

返回:

true if non-null and non-empty

isNotEmpty

public static boolean isNotEmpty(Dictionary coll)

Null-safe check if the specified Dictionary is not empty.

Null returns false.

参数:

coll - the collection to check, may be null

返回:

true if non-null and non-empty

putIfValNoNull

public static void putIfValNoNull(Map target,
                                  Object key,
                                  Object value)

Put into map if value is not null.

参数:

target - target map

key - key

value - value

putIfValNoEmpty

public static void putIfValNoEmpty(Map target,
                                   Object key,
                                   Object value)

Put into map if value is not empty.

参数:

target - target map

key - key

value - value

computeIfAbsent

@NotThreadSafe
public static <K,C,V,T> V computeIfAbsent(Map<K,V> target,
                                                         K key,
                                                         BiFunction<C,T,V> mappingFunction,
                                                         C param1,
                                                         T param2)

ComputeIfAbsent lazy load.

参数:

target - target Map data.

key - map key.

mappingFunction - function which is need to be executed.

param1 - function's parameter value1.

param2 - function's parameter value1.

返回:

removeKey

public static <K,V> V removeKey(Map<K,V> map,
                                K key,
                                Predicate<V> removeJudge)

remove value, Thread safety depends on whether the Map is a thread-safe Map.

类型参数:

K - key type

V - value type

参数:

map - map

key - key

removeJudge - judge this key can be remove

返回:

value