Package pl.matsuo.core.util.collection

Class CollectionUtil

java.lang.Object

pl.matsuo.core.util.collection.CollectionUtil

public class CollectionUtil
extends Object

Helper methods for collection operations

Constructor Summary

Constructors

Constructor	Description
CollectionUtil()

Method Summary

Modifier and Type	Method	Description
static <E> boolean	allMatch(Collection<E> collection, Predicate<E> condition)
static <E> boolean	anyMatch(Collection<E> collection, Predicate<E> condition)
static <E> List<E>	filter(Collection<E> collection, Predicate<E> condition)
static <E, F> List<F>	filterMap(Collection<E> collection, Function<E,F> mapper)
static <E, F> List<F>	filterMap(Collection<E> collection, Predicate<E> condition, Function<E,F> mapper)
static <E> Optional<E>	findFirst(Collection<E> collection, Predicate<E> condition)
static <F, T> List<T>	flatMap(Collection<? extends F> collection, Function<F,Collection<T>> mapper)
static <F, T> T	fold(Collection<? extends F> list, T startValue, BiFunction<T,F,T> reducer)	Reduce list elements.
static <E> E	getFirst(Collection<E> collection, Predicate<E> condition)
static <E> List<Pair<Integer,E>>	indexed(Collection<E> collection)
static <E> E	last(List<E> list)
static <F, T> List<T>	map(Collection<? extends F> collection, Function<F,T> mapper)
static <E> List<E>	merge(Collection<Collection<E>> collections)
static <E> boolean	noneMatch(Collection<E> collection, Predicate<E> condition)
static List<Integer>	range(Integer start, Integer end)
static <E> List<E>	removeNulls(Collection<E> collection)
static Map<String,String>	stringMap(String... keyValues)
static <E, F, G> Map<F,G>	toMap(Collection<E> collection, Function<E,F> keyMapper, Function<E,G> valueMapper)	Create map from collection.
static <E, F> Map<E,F>	toMap(Pair<E,F>... entries)	Create map from array of key value pairs.

Methods inherited from class java.lang.Object

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

Constructor Details

CollectionUtil

public CollectionUtil()

Method Details

map

public static <F,
T> List<T> map(Collection<? extends F> collection,
 Function<F,T> mapper)

filter

public static <E> List<E> filter(Collection<E> collection,
 Predicate<E> condition)

filterMap

public static <E,
F> List<F> filterMap(Collection<E> collection,
 Function<E,F> mapper)

filterMap

public static <E,
F> List<F> filterMap(Collection<E> collection,
 Predicate<E> condition,
 Function<E,F> mapper)

toMap

public static <E,
F,
G> Map<F,G> toMap(Collection<E> collection,
 Function<E,F> keyMapper,
 Function<E,G> valueMapper)

Create map from collection.

toMap

public static <E,
F> Map<E,F> toMap(Pair<E,F>... entries)

Create map from array of key value pairs.

last

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

merge

public static <E> List<E> merge(Collection<Collection<E>> collections)

removeNulls

public static <E> List<E> removeNulls(Collection<E> collection)

stringMap

public static Map<String,String> stringMap(String... keyValues)

fold

public static <F,
T> T fold(Collection<? extends F> list,
 T startValue,
 BiFunction<T,F,T> reducer)

Reduce list elements.

flatMap

public static <F,
T> List<T> flatMap(Collection<? extends F> collection,
 Function<F,Collection<T>> mapper)

indexed

public static <E> List<Pair<Integer,E>> indexed(Collection<E> collection)

range

public static List<Integer> range(Integer start,
 Integer end)

getFirst

public static <E> E getFirst(Collection<E> collection,
 Predicate<E> condition)

findFirst

public static <E> Optional<E> findFirst(Collection<E> collection,
 Predicate<E> condition)

anyMatch

public static <E> boolean anyMatch(Collection<E> collection,
 Predicate<E> condition)

allMatch

public static <E> boolean allMatch(Collection<E> collection,
 Predicate<E> condition)

noneMatch

public static <E> boolean noneMatch(Collection<E> collection,
 Predicate<E> condition)