usbhubdevicetodrivermapper.java

纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统

/*
 * $Id: USBHubDeviceToDriverMapper.java,v 1.1 2003/11/25 11:42:24 epr Exp $
 */
package org.jnode.driver.usb.hub;

import org.jnode.driver.Device;
import org.jnode.driver.DeviceToDriverMapper;
import org.jnode.driver.Driver;
import org.jnode.driver.usb.USBConstants;
import org.jnode.driver.usb.USBDevice;

/**
 * Device to driver mapper for the USB HUB driver.
 * 
 * @author Ewout Prangsma ([e-mail])
 */
public class USBHubDeviceToDriverMapper implements DeviceToDriverMapper, USBConstants {

	/**
	 * @see org.jnode.driver.DeviceToDriverMapper#findDriver(org.jnode.driver.Device)
	 */
	public Driver findDriver(Device device) {
		if (!(device instanceof USBDevice)) {
			return null;
		}

		final USBDevice dev = (USBDevice) device;
		if (dev.getDescriptor().getDeviceClass() != USB_CLASS_HUB) {
			return null;
		}

		// We found an USB HUB
		return new USBHubDriver();
	}

	
	/**
	 * Gets the matching level of this mapper.
	 * The mappers are queried in order of match level. This will ensure
	 * the best available driver for a device.
	 * 
	 * @return One of the MATCH_xxx constants.
	 * @see #MATCH_DEVICE_REVISION
	 * @see #MATCH_DEVICE
	 * @see #MATCH_DEVCLASS
	 */
	public int getMatchLevel() {
		return MATCH_DEVCLASS;
	}
}