Package org.keycloak.common.util

Class CollectionUtil

java.lang.Object

org.keycloak.common.util.CollectionUtil

public class CollectionUtil
extends Object

Author:

Jeroen Rosenberg

Constructor Summary

Constructors

Constructor	Description
CollectionUtil()

Method Summary

Modifier and Type	Method	Description
static <T> boolean	collectionEquals(Collection<T> col1, Collection<T> col2)
static <T> Set<T>	collectionToSet(Collection<T> collection)
static boolean	isEmpty(Collection<?> collection)
static boolean	isNotEmpty(Collection<?> collection)
static String	join(Collection<String> strings)
static String	join(Collection<String> strings, String separator)
static <T> List<List<T>>	partition(Collection<T> items, int chunkSize)	Splits the given collection into consecutive chunks of at most chunkSize elements, preserving iteration order.

Methods inherited from class java.lang.Object

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

Constructor Details

CollectionUtil

public CollectionUtil()

Method Details

join

public static String join(Collection<String> strings)

join

public static String join(Collection<String> strings,
 String separator)

collectionEquals

public static <T> boolean collectionEquals(Collection<T> col1,
 Collection<T> col2)

isEmpty

public static boolean isEmpty(Collection<?> collection)

isNotEmpty

public static boolean isNotEmpty(Collection<?> collection)

collectionToSet

public static <T> Set<T> collectionToSet(Collection<T> collection)

partition

public static <T> List<List<T>> partition(Collection<T> items,
 int chunkSize)

Splits the given collection into consecutive chunks of at most chunkSize elements, preserving iteration order. Every chunk except possibly the last has exactly chunkSize elements. The returned chunks are independent copies and do not reference the source collection.

Parameters:

items - the collection to split; may be null

chunkSize - the maximum number of elements per chunk; must be greater than 0

Returns:

list of chunks; an empty list if items is null or empty

Throws:

IllegalArgumentException - if chunkSize is not positive