Module org.evrete.core

Package org.evrete.util

Class CollectionUtils

java.lang.Object

org.evrete.util.CollectionUtils

public final class CollectionUtils
extends Object

The CollectionUtils class provides utility methods for working with collections.

Constructor Summary

Constructors

Constructor	Description
CollectionUtils()

Method Summary

Modifier and Type	Method	Description
static <T> T[]	array(Class<T> type, int size)
static <E, T extends Collection<E>> Collection<List<E>>	combinations(Collection<T> sources)	For argument like [[a1, a2, a3], [b1, b2], [c1, c2]] method returns collection of size L = a.size() * b.size() * c.size() = 12 where each entry is a combination of the three input sources: [a1, b1 ,c1], [a1, b1, c2], [a1, b2, c1] ....
static <T> T[]	copyOf(T[] arr)
static <T> ReIterator<T>	emptyReIterator()
static <E> List<List<E>>	permutation(List<E> l)
static void	systemFill(boolean[] array, boolean value)
static void	systemFill(int[] array, int value)
static <T> void	systemFill(T[] array, T value)

Methods inherited from class java.lang.Object

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

Constructor Details

CollectionUtils

public CollectionUtils()

Method Details

array

public static <T> T[] array(Class<T> type,
 int size)

copyOf

public static <T> T[] copyOf(T[] arr)

emptyReIterator

public static <T> ReIterator<T> emptyReIterator()

permutation

public static <E> List<List<E>> permutation(List<E> l)

combinations

public static <E,
T extends Collection<E>>
Collection<List<E>> combinations(Collection<T> sources)

For argument like [[a1, a2, a3], [b1, b2], [c1, c2]] method returns collection of size L = a.size() * b.size() * c.size() = 12 where each entry is a combination of the three input sources: [a1, b1 ,c1], [a1, b1, c2], [a1, b2, c1] .... [a3, b3, c2]

Type Parameters:

E - source type parameter

T - collection type parameter

Parameters:

sources - input collections

Returns:

all possible combinations

systemFill

public static void systemFill(int[] array,
 int value)

systemFill

public static void systemFill(boolean[] array,
 boolean value)

systemFill

public static <T> void systemFill(T[] array,
 T value)