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/*
* 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 org.apache.qpid.server.message.ServerMessage;
/**
* An implementation of QueueEntryImpl to be used in SortedQueueEntryList.
*/
public class SortedQueueEntryImpl extends QueueEntryImpl
{
public static enum Colour
{
RED, BLACK
};
private volatile SortedQueueEntryImpl _next;
private SortedQueueEntryImpl _prev;
private String _key;
private Colour _colour = Colour.BLACK;
private SortedQueueEntryImpl _parent;
private SortedQueueEntryImpl _left;
private SortedQueueEntryImpl _right;
public SortedQueueEntryImpl(final SortedQueueEntryList queueEntryList)
{
super(queueEntryList);
}
public SortedQueueEntryImpl(final SortedQueueEntryList queueEntryList,
final ServerMessage message, final long entryId)
{
super(queueEntryList, message, entryId);
}
@Override
public int compareTo(final QueueEntry o)
{
final String otherKey = ((SortedQueueEntryImpl) o)._key;
final int compare = _key == null ? (otherKey == null ? 0 : -1) : otherKey == null ? 1 : _key.compareTo(otherKey);
return compare == 0 ? super.compareTo(o) : compare;
}
public Colour getColour()
{
return _colour;
}
public String getKey()
{
return _key;
}
public SortedQueueEntryImpl getLeft()
{
return _left;
}
public SortedQueueEntryImpl getNextNode()
{
return _next;
}
@Override
public SortedQueueEntryImpl getNextValidEntry()
{
return getNextNode();
}
public SortedQueueEntryImpl getParent()
{
return _parent;
}
public SortedQueueEntryImpl getPrev()
{
return _prev;
}
public SortedQueueEntryImpl getRight()
{
return _right;
}
public void setColour(final Colour colour)
{
_colour = colour;
}
public void setKey(final String key)
{
_key = key;
}
public void setLeft(final SortedQueueEntryImpl left)
{
_left = left;
}
public void setNext(final SortedQueueEntryImpl next)
{
_next = next;
}
public void setParent(final SortedQueueEntryImpl parent)
{
_parent = parent;
}
public void setPrev(final SortedQueueEntryImpl prev)
{
_prev = prev;
}
public void setRight(final SortedQueueEntryImpl right)
{
_right = right;
}
@Override
public String toString()
{
return "(" + (_colour == Colour.RED ? "Red," : "Black,") + _key + ")";
}
}
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