net.ericaro.neoitertools.generators
Class GroupByGenerator<K,T>

java.lang.Object
  net.ericaro.neoitertools.generators.GroupByGenerator<K,T>

All Implemented Interfaces:

Generator<Pair<K,Generator<T>>>

public class GroupByGenerator<K,T>
extends java.lang.Object
implements Generator<Pair<K,Generator<T>>>

import there is a difference in implementation from the original python: in Python the generator returned in the Pair is dependent on the next() state, meaning that when you call next() the generator is no longer available. In java, Iterator have an extra "hasNext" method that cannot be implemented without calling the next method, hence, the python groupBy won't work at all. Therefore we store values in the pair

Author:

eric

See Also:

GroupByGenerator's wiki page, neoitertools site

Constructor Summary

GroupByGenerator(Generator<T> generator, Lambda<T,K> keyMapper)

Method Summary

Pair<K,Generator<T>>

next()

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupByGenerator

public GroupByGenerator(Generator<T> generator,
                        Lambda<T,K> keyMapper)

Method Detail

next

public Pair<K,Generator<T>> next()
                          throws java.util.NoSuchElementException

Specified by:

next in interface Generator<Pair<K,Generator<T>>>

Returns:

the next item in the sequence.

Throws:

java.util.NoSuchElementException - when sequence is exhausted.