| package org.apache.qpid.proton.engine.impl; |
| /* |
| * |
| * 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. |
| * |
| */ |
| |
| |
| class LinkNode<E> |
| { |
| public interface Query<T> |
| { |
| public boolean matches(LinkNode<T> node); |
| } |
| |
| |
| private E _value; |
| private LinkNode<E> _prev; |
| private LinkNode<E> _next; |
| |
| private LinkNode(E value) |
| { |
| _value = value; |
| } |
| |
| public E getValue() |
| { |
| return _value; |
| } |
| |
| public LinkNode<E> getPrev() |
| { |
| return _prev; |
| } |
| |
| public LinkNode<E> getNext() |
| { |
| return _next; |
| } |
| |
| public LinkNode<E> next(Query<E> query) |
| { |
| LinkNode<E> next = _next; |
| while(next != null && !query.matches(next)) |
| { |
| next = next.getNext(); |
| } |
| return next; |
| } |
| |
| public LinkNode<E> remove() |
| { |
| LinkNode<E> prev = _prev; |
| LinkNode<E> next = _next; |
| if(prev != null) |
| { |
| prev._next = next; |
| } |
| if(next != null) |
| { |
| next._prev = prev; |
| } |
| _next = _prev = null; |
| return next; |
| } |
| |
| public LinkNode<E> addAtTail(E value) |
| { |
| if(_next == null) |
| { |
| _next = new LinkNode<E>(value); |
| _next._prev = this; |
| return _next; |
| } |
| else |
| { |
| return _next.addAtTail(value); |
| } |
| } |
| |
| public static <T> LinkNode<T> newList(T value) |
| { |
| return new LinkNode<T>(value); |
| } |
| |
| |
| } |