org.calrissian.mango.collect

Class Iterators2

java.lang.Object

org.calrissian.mango.collect.Iterators2

public class Iterators2
extends Object

Additional functions for working on Iterators

Method Summary

Modifier and Type	Method and Description
static <T> Iterator<T>	distinct(Iterator<T> iterator) If we can assume the iterator is sorted, return the distinct elements.
static <T> Iterator<List<T>>	groupBy(Iterator<? extends T> iterator, Function<? super T,?> groupingFunction) Divides an iterator into unmodifiable sublists of equivalent elements.

Methods inherited from class java.lang.Object

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

Method Detail

distinct

public static <T> Iterator<T> distinct(Iterator<T> iterator)

If we can assume the iterator is sorted, return the distinct elements. This only works if the data provided is sorted.

groupBy

public static <T> Iterator<List<T>> groupBy(Iterator<? extends T> iterator,
                                            Function<? super T,?> groupingFunction)

Divides an iterator into unmodifiable sublists of equivalent elements. The iterator groups elements in consecutive order, forming a new parition when the value from the provided function changes. For example, grouping the iterator [1, 3, 2, 4, 5] with a function grouping even and odd numbers yields [[1, 3], [2, 4], [5] all in the original order.

The returned lists implement RandomAccess.