Module org.evrete.core

Package org.evrete.util

Class CombinationIterator<T>

java.lang.Object

org.evrete.util.CombinationIterator<T>

Type Parameters:

T - The type of the elements generated by the source iterators.

All Implemented Interfaces:

Iterator<T[]>

public class CombinationIterator<T>
extends Object
implements Iterator<T[]>

An iterator that generates all possible combinations of elements from source objects.

Constructor Summary

Constructors

Constructor	Description
CombinationIterator(Class<T> type, S[] sources, Function<S,Iterator<T>> iteratorFunction)	Class constructor
CombinationIterator(S[] sources, T[] sharedResultArray, Function<S,Iterator<T>> iteratorFunction)	Class constructor with shared result array that will be updated on each next() operation
CombinationIterator(T[] sharedResultArray, IntFunction<Iterator<T>> iteratorFunction)	Class constructor with shared result array that will be updated on each next() operation

Method Summary

Modifier and Type	Method	Description
protected T	advanceIterator(int index)
boolean	hasNext()
T[]	next()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Constructor Details

CombinationIterator

public CombinationIterator(Class<T> type,
 S[] sources,
 Function<S,Iterator<T>> iteratorFunction)

Class constructor

Parameters:

type - type of the resulting array

sources - an array of sources

iteratorFunction - a mapping function to create iterators from sources

CombinationIterator

public CombinationIterator(S[] sources,
 T[] sharedResultArray,
 Function<S,Iterator<T>> iteratorFunction)

Class constructor with shared result array that will be updated on each next() operation

Parameters:

sources - an array of sources

sharedResultArray - a shared result array

iteratorFunction - a mapping function to create iterators from sources

CombinationIterator

public CombinationIterator(T[] sharedResultArray,
 IntFunction<Iterator<T>> iteratorFunction)

Class constructor with shared result array that will be updated on each next() operation

Parameters:

sharedResultArray - a shared result array

iteratorFunction - a mapping function to create iterators by array index

Method Details

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<T>

advanceIterator

protected T advanceIterator(int index)

next

public T[] next()

Specified by:

next in interface Iterator<T>