co.codewizards.cloudstore.core.util

Class CollectionUtil

java.lang.Object

co.codewizards.cloudstore.core.util.CollectionUtil

public final class CollectionUtil
extends Object

Method Summary

Modifier and Type	Method and Description
static <E> List<E>	asListWithoutNullElements(E... elements)
static <E> Collection<E>	nullToEmpty(Collection<E> collection)
static <E> Iterator<E>	nullToEmpty(Iterator<E> iterator)
static <E> List<E>	nullToEmpty(List<E> list)
static <E> Set<E>	nullToEmpty(Set<E> set)
static <E> List<List<E>>	splitList(List<E> inputList, int maxSize) Splits a given List into multiple Lists, each with the maximum size specified.
static <E> List<Set<E>>	splitSet(Set<E> inputSet, int maxSize) Splits a given Set into multiple Sets, each with the maximum size specified.

Methods inherited from class java.lang.Object

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

Method Detail

splitSet

public static <E> List<Set<E>> splitSet(Set<E> inputSet,
                                        int maxSize)

Splits a given Set into multiple Sets, each with the maximum size specified.

For example, imagine a Set with 26 elements. Invoking this method with maxSize == 10 will cause a resulting List having 3 Set elements. The first 2 of the Set elements each have 10 elements, while the 3rd one will have only 6 elements.

Please note that the order is maintained (LinkedHashSet is used internally for each segment-Set).

Parameters:

inputSet - the Set to be split. Must not be null. This Set is not modified in any way by this method.

maxSize - the maximum size of each resulting segment-Set. Must be greater than 0.

Returns:

a List containing all elements from the given inputSet in the same order, grouped in groups each not greater than maxSize. Never null.

See Also:

splitList(List, int)

splitList

public static <E> List<List<E>> splitList(List<E> inputList,
                                          int maxSize)

Splits a given List into multiple Lists, each with the maximum size specified.

For example, imagine a List with 26 elements. Invoking this method with maxSize == 10 will cause a resulting List having 3 List elements. The first 2 of the List elements each have 10 elements, while the 3rd one will have only 6 elements.

Please note that the order is maintained.

Parameters:

inputList - the List to be split. Must not be null. This List is not modified in any way by this method.

maxSize - the maximum size of each resulting segment-List. Must be greater than 0.

Returns:

a List containing all elements from the given inputList in the same order, grouped in groups each not greater than maxSize. Never null.

See Also:

splitSet(Set, int)

nullToEmpty

public static <E> List<E> nullToEmpty(List<E> list)

nullToEmpty

public static <E> Set<E> nullToEmpty(Set<E> set)

nullToEmpty

public static <E> Collection<E> nullToEmpty(Collection<E> collection)

nullToEmpty

public static <E> Iterator<E> nullToEmpty(Iterator<E> iterator)

asListWithoutNullElements

@SafeVarargs
public static <E> List<E> asListWithoutNullElements(E... elements)