pu.pi.collect

Class Iterables

java.lang.Object

pu.pi.collect.Iterables

public final class Iterables
extends java.lang.Object

Author: xiaoxing Date: 29/09/13

Method Summary

Modifier and Type	Method and Description
static <T> java.lang.Iterable<java.util.List<T>>	partition(java.lang.Iterable<T> iterable, int size) Divides an iterable into unmodifiable sublists of the given size (the final iterable may be smaller).
static <T> java.lang.Iterable<java.util.List<T>>	partition(java.util.List<T> list, int size)

Methods inherited from class java.lang.Object

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

Method Detail

partition

public static <T> java.lang.Iterable<java.util.List<T>> partition(java.lang.Iterable<T> iterable,
                                                                  int size)

Divides an iterable into unmodifiable sublists of the given size (the final iterable may be smaller). For example, partitioning an iterable containing [a, b, c, d, e] with a partition size of 3 yields [[a, b, c], [d, e]] -- an outer iterable containing two inner lists of three and two elements, all in the original order.

Iterators returned by the returned iterable do not support the Iterator.remove() method. The returned lists implement RandomAccess, whether or not the input list does.

Note: The next method of the iterator within the Iterable is atomic.

Parameters:

iterable - the iterable to return a partitioned view of

size - the desired size of each partition (the last may be smaller)

Returns:

an iterable of unmodifiable lists containing the elements of iterable divided into partitions

Throws:

java.lang.IllegalArgumentException - if size is nonpositive

partition

public static <T> java.lang.Iterable<java.util.List<T>> partition(java.util.List<T> list,
                                                                  int size)