Package org.goplanit.utils.misc

Class IterableUtils

java.lang.Object

org.goplanit.utils.misc.IterableUtils

public class IterableUtils
extends Object

Utils for iterable class

Author:

markr

Constructor Summary

Constructors

Constructor	Description
IterableUtils()

Method Summary

Modifier and Type	Method	Description
static <T> Stream<T>	asStream(Iterable<T> iterable)	As non-parallel stream
static boolean	nullOrEmpty(Iterable<?> iterable)	Check if iterable is null or empty
static <T> long	sizeOfUsingLoop(Iterable<T> iterable)	Collect the number of entry edge segments of this vertex
static <T> long	sizeOfUsingStream(Iterable<T> iterable)	Collect the number of entry edge segments of this vertex
static <T> Iterable<T>	toIterable(Iterator<T> iterator)	Get iterable from iterator
static <T> List<T>	toList(Iterable<T> iterable)	Convert iterable to list of same type
static <T,K> Map<K,T>	toMap(Iterable<T> iterable, Function<T,K> getKey, Map<K,T> mapToFill)	Map iterable to a map with a custom key obtained from the iterable entries
static <U extends T,T> List<U>	toTypeCastList(Iterable<T> iterable)	Convert iterable to list of derived concrete type by type casting the entries

Methods inherited from class java.lang.Object

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

Constructor Detail

IterableUtils

public IterableUtils()

Method Detail

asStream

public static <T> Stream<T> asStream(Iterable<T> iterable)

As non-parallel stream

Type Parameters:

T - type of the iterable

Parameters:

iterable - iterable to stream

Returns:

stream

toIterable

public static <T> Iterable<T> toIterable(Iterator<T> iterator)

Get iterable from iterator

Type Parameters:

T - type of iterator values

Parameters:

iterator - to convert to iterable

Returns:

iterable

sizeOfUsingStream

public static <T> long sizeOfUsingStream(Iterable<T> iterable)

Collect the number of entry edge segments of this vertex

slow method because it requires iterating over the underlying iterable since it is not a collection we are obtain the count from

Type Parameters:

T - iterable type

Parameters:

iterable - to count number of entries on by looping over the entire iterable

Returns:

number of entry edge segments

sizeOfUsingLoop

public static <T> long sizeOfUsingLoop(Iterable<T> iterable)

Collect the number of entry edge segments of this vertex

slow method because it requires iterating over the underlying iterable since it is not a collection we are obtain the count from

Type Parameters:

T - iterable type

Parameters:

iterable - to count number of entries on by looping over the entire iterable

Returns:

number of entry edge segments

toMap

public static <T,K> Map<K,T> toMap(Iterable<T> iterable,
                                               Function<T,K> getKey,
                                               Map<K,T> mapToFill)

Map iterable to a map with a custom key obtained from the iterable entries

Type Parameters:

T - type of iterable

K - type of key

Parameters:

iterable - to use

getKey - function to extract key from entries

mapToFill - to fill

Returns:

populated map

toList

public static <T> List<T> toList(Iterable<T> iterable)

Convert iterable to list of same type

Type Parameters:

T - type of entries

Parameters:

iterable - to convert

Returns:

list of entries

toTypeCastList

public static <U extends T,T> List<U> toTypeCastList(Iterable<T> iterable)

Convert iterable to list of derived concrete type by type casting the entries

Type Parameters:

U - to be converted to this

T - original type of iterable

Parameters:

iterable - to convert

Returns:

list of U

nullOrEmpty

public static boolean nullOrEmpty(Iterable<?> iterable)

Check if iterable is null or empty

Parameters:

iterable - to check

Returns:

true when null or empty, false otherwise