/*
* Copyright 2009 Red Hat, Inc.
*
* Red Hat licenses this file to you under the Apache License, version 2.0
* (the "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package org.jboss.netty.channel.group;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
* @author <a href="http://gleamynode.net/">Trustin Lee</a>
* @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
*/
final class CombinedIterator<E> implements Iterator<E> {
private final Iterator<E> i1;
private final Iterator<E> i2;
private Iterator<E> currentIterator;
CombinedIterator(Iterator<E> i1, Iterator<E> i2) {
if (i1 == null) {
throw new NullPointerException("i1");
}
if (i2 == null) {
throw new NullPointerException("i2");
}
this.i1 = i1;
this.i2 = i2;
currentIterator = i1;
}
public boolean hasNext() {
boolean hasNext = currentIterator.hasNext();
if (hasNext) {
return true;
}
if (currentIterator == i1) {
currentIterator = i2;
return hasNext();
} else {
return false;
}
}
public E next() {
try {
E e = currentIterator.next();
return e;
} catch (NoSuchElementException e) {
if (currentIterator == i1) {
currentIterator = i2;
return next();
} else {
throw e;
}
}
}
public void remove() {
currentIterator.remove();
}
}