javolution.util.function

Class Reducers

java.lang.Object

javolution.util.function.Reducers

public class Reducers
extends Object

A set of useful reducers of collection elements.

Version:

6.0, July 21, 2013

Author:

Jean-Marie Dautelle

See Also:

FastCollection.reduce(Reducer)

Method Summary

Methods

Modifier and Type	Method and Description
static Reducer<Boolean>	and() Conditional 'and' operator (returns true if the collection is empty).
static <E> Reducer<E>	any(Class<? extends E> type) Returns any non-null element of the specified type.
static <E> Reducer<E>	max(Comparator<? super E> comparator) Returns the greatest element of a collection according to the specified comparator (returns null if the collection is empty).
static <E> Reducer<E>	min(Comparator<? super E> comparator) Returns the smallest element of a collection according to the collection comparator (returns null if the collection is empty).
static Reducer<Boolean>	or() Conditional 'or' operator (returns false if the collection is empty).
static Reducer<Integer>	sum() Returns the sum of the specified integers value (returns 0 if the collection is empty).

Methods inherited from class java.lang.Object

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

Method Detail

any

@Parallelizable
@Realtime(limit=LINEAR)
public static <E> Reducer<E> any(Class<? extends E> type)

Returns any non-null element of the specified type. This reducer stops iterating as soon as an element with the matching type is found.

max

@Parallelizable(mutexFree=true,
                comment="Internal use of AtomicReference")
@Realtime(limit=LINEAR)
public static <E> Reducer<E> max(Comparator<? super E> comparator)

Returns the greatest element of a collection according to the specified comparator (returns null if the collection is empty).

Parameters:

comparator - the comparator to use for comparison.

min

@Parallelizable(mutexFree=true,
                comment="Internal use of AtomicReference")
@Realtime(limit=LINEAR)
public static <E> Reducer<E> min(Comparator<? super E> comparator)

Returns the smallest element of a collection according to the collection comparator (returns null if the collection is empty).

and

@Parallelizable
@Realtime(limit=LINEAR)
public static Reducer<Boolean> and()

Conditional 'and' operator (returns true if the collection is empty). This operator stops iterating as soon as a false value is found.

or

@Parallelizable
@Realtime(limit=LINEAR)
public static Reducer<Boolean> or()

Conditional 'or' operator (returns false if the collection is empty). This operator stops iterating as soon as a true value is found.

sum

@Parallelizable(comment="Internal use of AtomicInteger")
@Realtime(limit=LINEAR)
public static Reducer<Integer> sum()

Returns the sum of the specified integers value (returns 0 if the collection is empty).