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