software.amazon.awssdk.utils

Class CollectionUtils

java.lang.Object

software.amazon.awssdk.utils.CollectionUtils

public final class CollectionUtils
extends Object

Method Summary

Modifier and Type	Method and Description
static <T,U> Map<T,List<U>>	deepCopyMap(Map<T,? extends List<U>> map) Perform a deep copy of the provided map of lists.
static <T,U> Map<T,List<U>>	deepCopyMap(Map<T,? extends List<U>> map, Supplier<Map<T,List<U>>> mapConstructor) Perform a deep copy of the provided map of lists.
static <T,U> Map<T,List<U>>	deepUnmodifiableMap(Map<T,? extends List<U>> map) Perform a deep copy of the provided map of lists, and make the result unmodifiable.
static <T,U> Map<T,List<U>>	deepUnmodifiableMap(Map<T,? extends List<U>> map, Supplier<Map<T,List<U>>> mapConstructor) Perform a deep copy of the provided map of lists, and make the result unmodifiable.
static boolean	isNullOrEmpty(Collection<?> collection)
static boolean	isNullOrEmpty(Map<?,?> map)
static <K,VInT,VOutT> Map<K,VOutT>	mapValues(Map<K,VInT> inputMap, Function<VInT,VOutT> mapper)
static <T> List<T>	mergeLists(List<T> list1, List<T> list2) Returns a new list containing the second list appended to the first list.
static <K,V> Collector<Map.Entry<K,V>,?,Map<K,V>>	toMap() Collect a stream of Map.Entry to a Map with the same key/value types

Methods inherited from class java.lang.Object

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

Method Detail

isNullOrEmpty

public static boolean isNullOrEmpty(Collection<?> collection)

isNullOrEmpty

public static boolean isNullOrEmpty(Map<?,?> map)

mergeLists

public static <T> List<T> mergeLists(List<T> list1,
                                     List<T> list2)

Returns a new list containing the second list appended to the first list.

deepCopyMap

public static <T,U> Map<T,List<U>> deepCopyMap(Map<T,? extends List<U>> map)

Perform a deep copy of the provided map of lists. This only performs a deep copy of the map and lists. Entries are not copied, so care should be taken to ensure that entries are immutable if preventing unwanted mutations of the elements is desired.

deepCopyMap

public static <T,U> Map<T,List<U>> deepCopyMap(Map<T,? extends List<U>> map,
                                               Supplier<Map<T,List<U>>> mapConstructor)

Perform a deep copy of the provided map of lists. This only performs a deep copy of the map and lists. Entries are not copied, so care should be taken to ensure that entries are immutable if preventing unwanted mutations of the elements is desired.

deepUnmodifiableMap

public static <T,U> Map<T,List<U>> deepUnmodifiableMap(Map<T,? extends List<U>> map)

Perform a deep copy of the provided map of lists, and make the result unmodifiable.

deepUnmodifiableMap

public static <T,U> Map<T,List<U>> deepUnmodifiableMap(Map<T,? extends List<U>> map,
                                                       Supplier<Map<T,List<U>>> mapConstructor)

Perform a deep copy of the provided map of lists, and make the result unmodifiable.

toMap

public static <K,V> Collector<Map.Entry<K,V>,?,Map<K,V>> toMap()

Collect a stream of Map.Entry to a Map with the same key/value types

Type Parameters:

K - the key type

V - the value type

Returns:

a map

mapValues

public static <K,VInT,VOutT> Map<K,VOutT> mapValues(Map<K,VInT> inputMap,
                                                    Function<VInT,VOutT> mapper)