com.alibaba.testable.core.util

Class CollectionUtil

java.lang.Object

com.alibaba.testable.core.util.CollectionUtil

public class CollectionUtil
extends Object

Constructor Summary

Constructors

Constructor and Description
CollectionUtil()

Method Summary

Modifier and Type	Method and Description
static <T> T[]	arrayOf(T... items) Create an array
static <T> boolean	contains(T[] collection, T target) Check whether target exist in collection
static boolean	containsAny(Collection<?> collectionLeft, Collection<?> collectionRight) Check two collection has any equaled item
static String	join(Collection<?> collection, String joinSymbol) Join a collection into string
static <T> List<T>	listOf(T... items) Create a list
static <K,V> Map<K,V>	mapOf(Pair<K,V>... pair) Create a map
static <T> List<T>	mutableListOf(T... items) Generate a list of item
static <K,V> Map<K,V>	orderMapOf(Pair<K,V>... pair) Create an ordered map
static <T> Set<T>	setOf(T... items) Create a set
static Object[]	slice(Object[] args, int startPos) Get slice of args[startPos, args.length]
static Object[]	slice(Object[] args, int startPos, int endPos) Get slice of args[startPos, endPos]

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectionUtil

public CollectionUtil()

Method Detail

slice

public static Object[] slice(Object[] args,
                             int startPos)

Get slice of args[startPos, args.length]

Parameters:

args - original item array

startPos - index of the first item to keep

Returns:

a new array with sliced items

slice

public static Object[] slice(Object[] args,
                             int startPos,
                             int endPos)

Get slice of args[startPos, endPos]

Parameters:

args - original item array

startPos - index of the first item to keep

endPos - index of the last item to keep

Returns:

a new array with sliced items

join

public static String join(Collection<?> collection,
                          String joinSymbol)

Join a collection into string

Parameters:

collection - many items with proper toString() method

joinSymbol - splitter of echo items

Returns:

a joined string

contains

public static <T> boolean contains(T[] collection,
                                   T target)

Check whether target exist in collection

Parameters:

collection - many items to find from

target - an item to be found

Returns:

whether target exist in collection

containsAny

public static boolean containsAny(Collection<?> collectionLeft,
                                  Collection<?> collectionRight)

Check two collection has any equaled item

Parameters:

collectionLeft - the first collection

collectionRight - the second collection

Returns:

whether any equaled item found

arrayOf

public static <T> T[] arrayOf(T... items)

Create an array

Parameters:

items - elements to add

Returns:

array of the provided items

listOf

public static <T> List<T> listOf(T... items)

Create a list

Parameters:

items - elements to add

Returns:

list of the provided items

mutableListOf

public static <T> List<T> mutableListOf(T... items)

Generate a list of item

Parameters:

items - elements to add

Returns:

mutable list of the provided items

setOf

public static <T> Set<T> setOf(T... items)

Create a set

Parameters:

items - elements to add

Returns:

set of the provided items

mapOf

public static <K,V> Map<K,V> mapOf(Pair<K,V>... pair)

Create a map

Parameters:

pair - elements to add

Returns:

map of the provided items

orderMapOf

public static <K,V> Map<K,V> orderMapOf(Pair<K,V>... pair)

Create an ordered map

Parameters:

pair - elements to add

Returns:

ordered map of the provided items