org.infinispan.commons.util

Class InfinispanCollections

java.lang.Object

org.infinispan.commons.util.InfinispanCollections

public final class InfinispanCollections
extends java.lang.Object

Static helpers for Infinispan-specific collections

Since:

4.0

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	InfinispanCollections.Function<E,T> A function that converts a type into another one.
static interface	InfinispanCollections.MapMakerFunction<K,V,E> A function that converts an entry into a key/value pair for use in a map.

Method Summary

Modifier and Type	Method and Description
static void	assertNotNullEntries(java.util.Collection<?> collection, java.lang.String name)
static void	assertNotNullEntries(java.util.Map<?,?> map, java.lang.String name)
static <T> boolean	containsAny(java.util.Collection<T> haystack, java.util.Collection<T> needles)
static <E> java.util.Set<E>	difference(java.util.Set<? extends E> s1, java.util.Set<? extends E> s2) Returns the elements that are present in s1 but which are not present in s2, without changing the contents of neither s1, nor s2.
static <T> void	forEach(T[] array, java.util.function.Consumer<T> consumer)
static <T> java.util.List<T>	mergeLists(java.util.List<T> one, java.util.List<T> second)
static <K,V> java.util.Map<K,V>	mergeMaps(java.util.Map<K,V> one, java.util.Map<K,V> second)
static java.util.Set<java.lang.Object>	toObjectSet(java.util.Collection<?> collection)
static <K,V,E> java.util.Map<K,V>	transformCollectionToMap(java.util.Collection<? extends E> input, InfinispanCollections.MapMakerFunction<K,V,? super E> f) Given a collection, transforms the collection to a map given a InfinispanCollections.MapMakerFunction
static <K,V,E> java.util.Map<K,V>	transformMapValue(java.util.Map<K,E> input, InfinispanCollections.Function<E,V> f) Given a map of well known key/value types, it makes a shallow copy of it while at the same time transforming it's value type to a desired output type.

Methods inherited from class java.lang.Object

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

Method Detail

transformMapValue

public static <K,V,E> java.util.Map<K,V> transformMapValue(java.util.Map<K,E> input,
                                                           InfinispanCollections.Function<E,V> f)

Given a map of well known key/value types, it makes a shallow copy of it while at the same time transforming it's value type to a desired output type. The transformation of the value type is done using a given a function.

Type Parameters:

K - input map's key type

V - desired output type of the map's value

E - input map's value type

Parameters:

input - contains the input key/value pair map

f - function instance to use to transform the value part of the map

Returns:

a shallow copy of the input Map with all its values transformed.

transformCollectionToMap

public static <K,V,E> java.util.Map<K,V> transformCollectionToMap(java.util.Collection<? extends E> input,
                                                                  InfinispanCollections.MapMakerFunction<K,V,? super E> f)

Given a collection, transforms the collection to a map given a InfinispanCollections.MapMakerFunction

Type Parameters:

K - output map's key type

V - output type of the map's value

E - input collection's entry type

Parameters:

input - contains a collection of type E

f - MapMakerFunction instance to use to transform the collection to a key/value pair

Returns:

a Map with keys and values generated from the input collection

difference

public static <E> java.util.Set<E> difference(java.util.Set<? extends E> s1,
                                              java.util.Set<? extends E> s2)

Returns the elements that are present in s1 but which are not present in s2, without changing the contents of neither s1, nor s2.

Type Parameters:

E - type of objects in Set

Parameters:

s1 - first set

s2 - second set

Returns:

the elements in s1 that are not in s2

containsAny

public static <T> boolean containsAny(java.util.Collection<T> haystack,
                                      java.util.Collection<T> needles)

forEach

public static <T> void forEach(T[] array,
                               java.util.function.Consumer<T> consumer)

assertNotNullEntries

public static void assertNotNullEntries(java.util.Map<?,?> map,
                                        java.lang.String name)

assertNotNullEntries

public static void assertNotNullEntries(java.util.Collection<?> collection,
                                        java.lang.String name)

mergeMaps

public static <K,V> java.util.Map<K,V> mergeMaps(java.util.Map<K,V> one,
                                                 java.util.Map<K,V> second)

mergeLists

public static <T> java.util.List<T> mergeLists(java.util.List<T> one,
                                               java.util.List<T> second)

toObjectSet

public static java.util.Set<java.lang.Object> toObjectSet(java.util.Collection<?> collection)