/*
* $Id$
*
* Copyright (C) 2003-2015 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.driver.net.via_rhine;
import org.jnode.system.resource.ResourceManager;
/**
* @author Levente S\u00e1ntha
*/
abstract class ViaRhineRing<T extends ViaRhineDesc> {
final int RING_SIZE;
T[] ring;
int ringAddr = 0;
int current;
@SuppressWarnings("unchecked")
ViaRhineRing(ResourceManager rm, int size) {
this.RING_SIZE = size;
ring = (T[]) new ViaRhineDesc[RING_SIZE];
for (int i = 0; i < RING_SIZE; i++) {
ring[i] = createDescr(rm);
if (i == 0)
ringAddr = ring[0].descAddr;
else
ring[i - 1].setNextDescAddr(ring[i].descAddr);
}
ring[RING_SIZE - 1].setNextDescAddr(ringAddr);
}
abstract T createDescr(ResourceManager rm);
T currentDesc() {
return (T) ring[current];
}
void next() {
current = (current + 1) % RING_SIZE;
}
}