/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
***************************************************************************************
*/
package com.espertech.esper.collection;
import com.espertech.esper.client.EventBean;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* An iterator over an array of iterables.
*/
public final class IterablesArrayIterator implements Iterator<EventBean> {
private final Iterable<EventBean>[][] array;
private int index;
private Iterator<EventBean> currentIterator;
/**
* Constructor - takes a list of Iterable that supply the iterators to iterate over.
*
* @param iterables is a list of Iterable instances for which iterators to iterator over
*/
public IterablesArrayIterator(Iterable<EventBean>[][] iterables) {
array = iterables;
nextIterable();
}
public EventBean next() {
if (currentIterator == null) {
throw new NoSuchElementException();
}
if (currentIterator.hasNext()) {
return currentIterator.next();
}
nextIterable();
if (currentIterator == null) {
throw new NoSuchElementException();
}
return currentIterator.next();
}
public boolean hasNext() {
if (currentIterator == null) {
return false;
}
if (currentIterator.hasNext()) {
return true;
}
nextIterable();
if (currentIterator == null) {
return false;
}
return true;
}
public void remove() {
throw new UnsupportedOperationException();
}
private void nextIterable() {
while (index < array.length) {
Iterable<EventBean> iterable = array[index][0];
currentIterator = iterable.iterator();
index++;
if (currentIterator.hasNext()) {
return;
}
}
currentIterator = null;
}
}