com.atlassian.jira.util.function

Class Predicates

java.lang.Object

com.atlassian.jira.util.function.Predicates

public class Predicates
extends Object

Constructor Summary

Constructors

Constructor and Description
Predicates()

Method Summary

Modifier and Type	Method and Description
static <T> java.util.function.Predicate<T>	distinctByKey(java.util.function.Function<? super T,Object> extractor) Returns thread-safe stateful predicate that returns whether it has seen the extracted value.
static <T> java.util.function.Predicate<T>	distinctByKey(java.util.function.Function<? super T,Object> extractor, int initialCapacity) Returns thread-safe stateful predicate that returns whether it has seen the extracted value.
static <T,S extends Set<Object>> java.util.function.Predicate<T>	distinctByKey(java.util.function.Function<? super T,Object> extractor, S seenSet) Returns stateful predicate that returns whether it has seen the extracted value.

Methods inherited from class java.lang.Object

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

Constructor Detail

Predicates

public Predicates()

Method Detail

distinctByKey

public static <T> java.util.function.Predicate<T> distinctByKey(java.util.function.Function<? super T,Object> extractor)

Returns thread-safe stateful predicate that returns whether it has seen the extracted value.

Type Parameters:

T - output type

Parameters:

extractor - function that should be used to extract the value

distinctByKey

public static <T> java.util.function.Predicate<T> distinctByKey(java.util.function.Function<? super T,Object> extractor,
                                                                int initialCapacity)

Returns thread-safe stateful predicate that returns whether it has seen the extracted value.

Type Parameters:

T - output type

Parameters:

extractor - function that should be used to extract the value

initialCapacity - initial capacity of internal state (a.k.a. how many unique elements you expect it to see)

distinctByKey

public static <T,S extends Set<Object>> java.util.function.Predicate<T> distinctByKey(java.util.function.Function<? super T,Object> extractor,
                                                                                      S seenSet)

Returns stateful predicate that returns whether it has seen the extracted value.

Type Parameters:

T - output type

Parameters:

extractor - function that should be used to extract the value

seenSet - backing collection that will be used to store whether given value was seen