/*
* $Id$
*
* 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;
/**
* A software representation of a hardware bus that has
* devices connected to it.
*
* @author Ewout Prangsma (epr@users.sourceforge.net)
* @see org.jnode.driver.Device
*/
public abstract class Bus {
/**
* My parent, or null if I'm the system bus
*/
private final Bus parent;
/**
* The device that is connected to the parent bus and "provides" this bus. This can be null.
*/
private final Device parentDevice;
/**
* Package protected initializer for the system bus.
*/
Bus() {
this.parent = null;
this.parentDevice = null;
}
/**
* Initialize a new bus.
*
* @param parent
*/
public Bus(Bus parent) {
this.parent = parent;
this.parentDevice = null;
}
/**
* Initialize a new bus.
*
* @param parent
*/
public Bus(Device parent) {
this.parent = parent.getBus();
this.parentDevice = parent;
}
/**
* Gets the parent of this bus, or null if this is the system bus.
*
* @return The parent
*/
public final Bus getParent() {
return this.parent;
}
/**
* Gets the device that is connected to the parent bus
* and "provides" this bus.
* This can be null.
*
* @return The parent device
*/
public final Device getParentDevice() {
return this.parentDevice;
}
}