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