cn.ponfee.disjob.common.collect

类 Collects

java.lang.Object

cn.ponfee.disjob.common.collect.Collects

public class Collects
extends Object

Collection utilities

作者:

Ponfee

字段概要

字段

限定符和类型	字段和说明
static Object[]	EMPTY_OBJECT_ARRAY

构造器概要

构造器

构造器和说明
Collects()

方法概要

限定符和类型	方法和说明
static <T> ArrayList<T>	asArrayList(T... array)
static <T> void	batchProcess(List<T> list, Consumer<List<T>> processor, int batchSize)
static <T> List<T>	concat(List<T> list, T... array)
static <K,V> Map<K,V>	concat(Map<K,V>... maps)
static <T> T[]	concat(T[] a1, T... a2)
static <S,T> List<T>	convert(Collection<S> source, Function<S,T> mapper)
static <K1,K2,V> Map<K2,V>	convert(Map<K1,V> source, Function<K1,K2> keyMapper)
static <K1,V1,K2,V2> Map<K2,V2>	convert(Map<K1,V1> source, Function<K1,K2> keyMapper, Function<V1,V2> valueMapper)
static <S,T> Set<T>	convert(Set<S> source, Function<S,T> mapper)
static <T> List<T>	drainAll(BlockingQueue<T> queue)
static <T> List<T>	duplicate(List<T> list)
static <T,R> List<R>	duplicate(List<T> list, Function<T,R> mapper) Returns the duplicates elements for list
static <T> List<T>	filter(List<T> list, Predicate<T> predicate)
static <T> T	findAny(Collection<T> coll, Predicate<T> predicate)
static <R> List<R>	generate(int size, IntFunction<R> mapper)
static <T> T	get(List<T> list, int index)
static <T> T	get(T[] array, int index)
static <T> T	getFirst(Collection<T> coll) Gets the first element from collection
static <T> T	getLast(Collection<T> coll) Gets the last element from collection
static <T> T	getLast(T[] array)
static <T> T[]	newArray(Class<?> arrayType, int length)
static <E> ArrayDeque<E>	newArrayDeque(E element)
static <E> ArrayList<E>	newArrayList(int initialCapacity, E element)
static <E> LinkedList<E>	newLinkedList(E element)
static List<int[]>	partition(int[] array, int size) Returns consecutive sub array of an array, each of the same size (the final list may be smaller).
static <E> List<E>	sorted(List<E> list, Comparator<? super E> comparator)
static <R> List<R>	split(String str, Function<String,R> converter)
static <R> List<R>	split(String str, String separator, Function<String,R> converter)
static <E,K> Map<K,E>	toMap(Collection<E> list, Function<E,K> keyMapper)
static <E,K,V> Map<K,V>	toMap(Collection<E> list, Function<E,K> keyMapper, Function<E,V> valueMapper)
static Properties	toProperties(Map<String,String> map)
static <T> Set<T>	truncate(Set<T> set, int length)

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

EMPTY_OBJECT_ARRAY

public static final Object[] EMPTY_OBJECT_ARRAY

构造器详细资料

Collects

public Collects()

方法详细资料

newLinkedList

public static <E> LinkedList<E> newLinkedList(E element)

newArrayDeque

public static <E> ArrayDeque<E> newArrayDeque(E element)

newArrayList

public static <E> ArrayList<E> newArrayList(int initialCapacity,
                                            E element)

truncate

public static <T> Set<T> truncate(Set<T> set,
                                  int length)

duplicate

public static <T> List<T> duplicate(List<T> list)

split

public static <R> List<R> split(String str,
                                Function<String,R> converter)

split

public static <R> List<R> split(String str,
                                String separator,
                                Function<String,R> converter)

generate

public static <R> List<R> generate(int size,
                                   IntFunction<R> mapper)

toMap

public static <E,K> Map<K,E> toMap(Collection<E> list,
                                   Function<E,K> keyMapper)

toMap

public static <E,K,V> Map<K,V> toMap(Collection<E> list,
                                     Function<E,K> keyMapper,
                                     Function<E,V> valueMapper)

convert

public static <K1,K2,V> Map<K2,V> convert(Map<K1,V> source,
                                          Function<K1,K2> keyMapper)

convert

public static <K1,V1,K2,V2> Map<K2,V2> convert(Map<K1,V1> source,
                                               Function<K1,K2> keyMapper,
                                               Function<V1,V2> valueMapper)

toProperties

public static Properties toProperties(Map<String,String> map)

duplicate

public static <T,R> List<R> duplicate(List<T> list,
                                      Function<T,R> mapper)

Returns the duplicates elements for list

参数:

list - the list

返回:

a set of duplicates elements for list

sorted

public static <E> List<E> sorted(List<E> list,
                                 Comparator<? super E> comparator)

getLast

public static <T> T getLast(T[] array)

getFirst

public static <T> T getFirst(Collection<T> coll)

Gets the first element from collection

类型参数:

T - the coll element type

参数:

coll - the coll

返回:

first element of coll

getLast

public static <T> T getLast(Collection<T> coll)

Gets the last element from collection

类型参数:

T - the coll element type

参数:

coll - the coll

返回:

last element of coll

get

public static <T> T get(T[] array,
                        int index)

get

public static <T> T get(List<T> list,
                        int index)

batchProcess

public static <T> void batchProcess(List<T> list,
                                    Consumer<List<T>> processor,
                                    int batchSize)

partition

public static List<int[]> partition(int[] array,
                                    int size)

Returns consecutive sub array of an array, each of the same size (the final list may be smaller).

  Collects.partition(new int[]{1,1,2,5,3}, 1)    ->  [1, 1, 2, 5, 3]
  Collects.partition(new int[]{1,1,2,5,3}, 3)    ->  [1, 1]; [2, 5]; [3]
  Collects.partition(new int[]{1,1,2,5,3}, 5)    ->  [1]; [1]; [2]; [5]; [3]
  Collects.partition(new int[]{1,1,2,5,3}, 6)    ->  [1]; [1]; [2]; [5]; [3]
  Collects.partition(new int[]{1,1,2,5,3}, 100)  ->  [1]; [1]; [2]; [5]; [3]
 

参数:

array - the array

size - the size

返回:

a list of consecutive sub sets

filter

public static <T> List<T> filter(List<T> list,
                                 Predicate<T> predicate)

findAny

public static <T> T findAny(Collection<T> coll,
                            Predicate<T> predicate)

convert

public static <S,T> List<T> convert(Collection<S> source,
                                    Function<S,T> mapper)

convert

public static <S,T> Set<T> convert(Set<S> source,
                                   Function<S,T> mapper)

concat

@SafeVarargs
public static <T> List<T> concat(List<T> list,
                                              T... array)

concat

@SafeVarargs
public static <T> T[] concat(T[] a1,
                                          T... a2)

concat

@SafeVarargs
public static <K,V> Map<K,V> concat(Map<K,V>... maps)

asArrayList

@SafeVarargs
public static <T> ArrayList<T> asArrayList(T... array)

drainAll

public static <T> List<T> drainAll(BlockingQueue<T> queue)

newArray

public static <T> T[] newArray(Class<?> arrayType,
                               int length)