| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.qpid.server.queue; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| public class QueueConsumerNodeIterator implements Iterator<QueueConsumerNode> |
| { |
| private QueueConsumerNodeListEntry _previous; |
| private QueueConsumerNodeListEntry _next; |
| private QueueConsumerNode _nextQueueConsumerNode; |
| |
| QueueConsumerNodeIterator(QueueConsumerNodeList list) |
| { |
| _previous = list.getHead(); |
| } |
| |
| @Override |
| public boolean hasNext() |
| { |
| do |
| { |
| _next = _previous.findNext(); |
| _nextQueueConsumerNode = _next == null ? null : _next.getQueueConsumerNode(); |
| } |
| while(_next != null && _nextQueueConsumerNode == null); |
| |
| return _next != null; |
| } |
| |
| @Override |
| public QueueConsumerNode next() |
| { |
| if(_next == null) |
| { |
| if (!hasNext()) |
| { |
| throw new NoSuchElementException(); |
| } |
| } |
| _previous = _next; |
| _next = null; |
| |
| QueueConsumerNode node = _nextQueueConsumerNode; |
| _nextQueueConsumerNode = null; |
| |
| return node; |
| } |
| |
| @Override |
| public void remove() |
| { |
| // code should use QueueConsumerNodeListEntry#remove instead |
| throw new UnsupportedOperationException(); |
| } |
| } |