org.dromara.dynamictp.common.util

类 StreamUtil

java.lang.Object

org.dromara.dynamictp.common.util.StreamUtil

public final class StreamUtil
extends Object

StreamUtil related

从以下版本开始:

1.0.0

作者:

yanhom

方法概要

限定符和类型	方法和说明
static <I,T> List<I>	fetchProperty(Collection<T> data, Function<T,I> mapping) Fetches id to list.
static <I,D> Map<I,List<D>>	toListMap(Collection<I> ids, Collection<D> list, Function<D,I> key) Converts a list to a list map where list contains id in ids.
static <O,D,P> Map<O,P>	toMap(Collection<D> list, Function<D,O> key, Function<D,P> value) Converts to map (key from the list data)
static <P,O> Map<O,P>	toMap(Collection<P> coll, Function<P,O> key) Converts to map (key from the list data)

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

fetchProperty

public static <I,T> List<I> fetchProperty(Collection<T> data,
                                          Function<T,I> mapping)

Fetches id to list.

类型参数:

I - id type

T - data type

参数:

data - data collection

mapping - calculate the id in data list

返回:

a list of id

toMap

public static <P,O> Map<O,P> toMap(Collection<P> coll,
                                   Function<P,O> key)

Converts to map (key from the list data)

类型参数:

O - id type

P - data type

参数:

coll - data list

key - key mapping function

返回:

a map which key from list data and value is data

toMap

public static <O,D,P> Map<O,P> toMap(Collection<D> list,
                                     Function<D,O> key,
                                     Function<D,P> value)

Converts to map (key from the list data)

类型参数:

O - id type

D - data type

P - value type

参数:

list - data list

key - key mapping function

value - value mapping function

返回:

a map which key from list data and value is data

toListMap

public static <I,D> Map<I,List<D>> toListMap(Collection<I> ids,
                                             Collection<D> list,
                                             Function<D,I> key)

Converts a list to a list map where list contains id in ids.

类型参数:

I - id type

D - data type

参数:

ids - id collection

list - data list

key - calculate the id in data list

返回:

a map which key is in ids and value containing in list