com.atlassian.jira.util

Class JiraCollectionUtils

java.lang.Object

com.atlassian.jira.util.JiraCollectionUtils

public final class JiraCollectionUtils
extends Object

Method Summary

Modifier and Type	Method and Description
static <T> Collection<T>	convertIterableToCollection(Iterable<T> iterable) Converts an iterable to a new collection if it isn't a collection already.
static <T> List<T>	listify(Optional<T> optional) Converts the given optional into a list.
static <T> java.util.stream.Stream<T>	streamFromOptional(Optional<T> optional) Turns an Optional into a Stream of length zero or one depending upon whether a value is present.
static String[]	stringCollectionToStringArray(Collection<String> allValues) Converts a String collection into a String array.

Methods inherited from class java.lang.Object

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

Method Detail

stringCollectionToStringArray

public static String[] stringCollectionToStringArray(Collection<String> allValues)

Converts a String collection into a String array.

Parameters:

allValues - The collection to convert

Returns:

An array holding all the values of the supplied collection

convertIterableToCollection

public static <T> Collection<T> convertIterableToCollection(Iterable<T> iterable)

Converts an iterable to a new collection if it isn't a collection already. If it is already a collection then the same instance is returned.

Type Parameters:

T - The type being iterated over

Parameters:

iterable - The iterable to be converted

Returns:

A collection of T

streamFromOptional

public static <T> java.util.stream.Stream<T> streamFromOptional(Optional<T> optional)

Turns an Optional into a Stream of length zero or one depending upon whether a value is present.

listify

@Nonnull
public static <T> List<T> listify(@Nonnull
                                           Optional<T> optional)

Converts the given optional into a list.

Type Parameters:

T - the wrapped type

Parameters:

optional - the optional to convert

Returns:

a list of zero or one elements

Since:

7.4