org.apache.drill.common.collections

Class Collectors

java.lang.Object

org.apache.drill.common.collections.Collectors

public class Collectors
extends Object

Method Summary

Modifier and Type	Method and Description
static <T,K,V> List<T>	collect(List<T> list, Map<K,V> map, BiFunction<K,V,T> mapper)
static <T,K,V> List<T>	collect(List<T> list, Map<K,V> map, BiFunction<K,V,T> mapper, Predicate<T> predicate)
static <T,E> List<T>	toList(Collection<E> collection, Function<E,T> mapper)
static <T,E> List<T>	toList(Collection<E> collection, Function<E,T> mapper, Predicate<T> predicate)
static <T,K,V> List<T>	toList(Map<K,V> map, BiFunction<K,V,T> mapper)
static <T,K,V> List<T>	toList(Map<K,V> map, BiFunction<K,V,T> mapper, Predicate<T> predicate)

Methods inherited from class java.lang.Object

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

Method Detail

toList

public static <T,K,V> List<T> toList(Map<K,V> map,
                                     BiFunction<K,V,T> mapper)

Type Parameters:

T - elements type in List

K - key type in Map

V - value type in Map

Parameters:

map - Map<K, V> to collect elements from

mapper - BiFunction that maps from (key, value) pair to type

Returns:

new List that contains elements after applying mapper BiFunction to the input Map

toList

public static <T,K,V> List<T> toList(Map<K,V> map,
                                     BiFunction<K,V,T> mapper,
                                     Predicate<T> predicate)

Type Parameters:

T - elements type in List

K - keys type in Map

V - value type in Map

Parameters:

map - Map<K, V> to collect elements from

mapper - BiFunction that maps from (key, value) pair to type

predicate - Predicate filter to apply

Returns:

new List that contains elements that satisfy Predicate after applying mapper BiFunction to the input Map

collect

public static <T,K,V> List<T> collect(List<T> list,
                                      Map<K,V> map,
                                      BiFunction<K,V,T> mapper)

collect

public static <T,K,V> List<T> collect(List<T> list,
                                      Map<K,V> map,
                                      BiFunction<K,V,T> mapper,
                                      Predicate<T> predicate)

toList

public static <T,E> List<T> toList(Collection<E> collection,
                                   Function<E,T> mapper)

Type Parameters:

T - elements type in List

E - elements type in Collection

Parameters:

collection - Collection<E> of elements of type

mapper - Function<E, T> mapper function to apply

Returns:

new List that contains elements that satisfy Predicate after applying mapper Function to the input Collection

toList

public static <T,E> List<T> toList(Collection<E> collection,
                                   Function<E,T> mapper,
                                   Predicate<T> predicate)

Type Parameters:

T - elements type in List

E - elements type in Collection

Parameters:

collection - Collection<E> of elements of type

mapper - Function<E, T> mapper function to apply

predicate - Predicate filter to apply

Returns:

new List that contains elements after applying mapper Function to the input Collection