package org.jacorb.notification.queue;
/*
* JacORB - a free Java ORB
*
* Copyright (C) 1999-2014 Gerald Brose / The JacORB Team.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
import java.util.Comparator;
import org.jacorb.notification.interfaces.Message;
/**
* @author Alphonse Bendt
*/
public class QueueUtil
{
private QueueUtil()
{
// not intended to be invoked
}
////////////////////////////////////////
static final Message[] MESSAGE_ARRAY_TEMPLATE = new Message[0];
public static Comparator ASCENDING_TIMEOUT_COMPARATOR = new Comparator()
{
public int compare(Object left, Object right)
{
final Message _left = (Message) left;
final Message _right = (Message) right;
if (_left.hasTimeout())
{
if (!_right.hasTimeout())
{
return -1;
}
return compareLong(_left.getTimeout(), _right.getTimeout());
}
else if (_right.hasTimeout())
{
return 1;
}
return 0;
}
};
public static Comparator ASCENDING_INSERT_ORDER_COMPARATOR = new Comparator()
{
public int compare(Object left, Object right)
{
final Message _left = (Message) left;
final Message _right = (Message) right;
return compareLong(_left.getReceiveTimestamp(), _right.getReceiveTimestamp());
}
};
public static Comparator DESCENDING_INSERT_ORDER_COMPARATOR = new Comparator()
{
public int compare(Object left, Object right)
{
return -ASCENDING_INSERT_ORDER_COMPARATOR.compare(left, right);
}
};
public static Comparator ASCENDING_PRIORITY_COMPARATOR = new Comparator()
{
public int compare(Object left, Object right)
{
final Message _right = (Message) right;
final Message _left = (Message) left;
return _left.getPriority() - _right.getPriority();
}
};
public static Comparator DESCENDING_PRIORITY_COMPARATOR = new Comparator()
{
public int compare(Object left, Object right)
{
return -ASCENDING_PRIORITY_COMPARATOR.compare(left, right);
}
};
private static int compareLong(long left, long right)
{
return left < right ? -1 : (left == right ? 0 : 1);
}
}