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package org.openslx.libvirt.domain.device;
import org.openslx.libvirt.xml.LibvirtXmlNode;
/**
* A hostdev PCI device node in a Libvirt domain XML document for PCI passthrough.
*
* @author Manuel Bentele
* @version 1.0
*/
public class HostdevPci extends Hostdev implements HostdevAddressableSource<HostdevPciDeviceAddress>,
HostdevAddressableTarget<HostdevPciDeviceAddress>
{
/**
* Creates an empty hostdev PCI device.
*/
public HostdevPci()
{
super();
}
/**
* Creates a hostdev PCI device representing an existing Libvirt XML hostdev PCI device element.
*
* @param xmlNode existing Libvirt XML hostdev PCI device element.
*/
public HostdevPci( LibvirtXmlNode xmlNode )
{
super( xmlNode );
}
/**
* Returns the PCI device address from an address XML element selected by a XPath expression.
*
* @param expression XPath expression to select the XML address element.
* @return PCI device address from the selected XML address element.
*/
private HostdevPciDeviceAddress getPciAddress( final String expression )
{
String pciDomain = this.getXmlElementAttributeValue( expression, "domain" );
String pciBus = this.getXmlElementAttributeValue( expression, "bus" );
String pciDevice = this.getXmlElementAttributeValue( expression, "slot" );
String pciFunction = this.getXmlElementAttributeValue( expression, "function" );
pciDomain = HostdevUtils.removeHexPrefix( pciDomain );
pciBus = HostdevUtils.removeHexPrefix( pciBus );
pciDevice = HostdevUtils.removeHexPrefix( pciDevice );
pciFunction = HostdevUtils.removeHexPrefix( pciFunction );
return HostdevPciDeviceAddress.valueOf( pciDomain + ":" + pciBus + ":" + pciDevice + "." + pciFunction );
}
/**
* Sets the PCI device address for an XML address element selected by a XPath expression.
*
* @param expression XPath expression to select the XML address element.
* @param address PCI device address for the selected XML address element.
*/
private void setPciAddress( final String expression, final HostdevPciDeviceAddress address )
{
final String pciDomain = HostdevUtils.appendHexPrefix( address.getPciDomainAsString() );
final String pciBus = HostdevUtils.appendHexPrefix( address.getPciBusAsString() );
final String pciDevice = HostdevUtils.appendHexPrefix( address.getPciDeviceAsString() );
final String pciFunction = HostdevUtils.appendHexPrefix( address.getPciFunctionAsString() );
this.setXmlElementAttributeValue( expression, "domain", pciDomain );
this.setXmlElementAttributeValue( expression, "bus", pciBus );
this.setXmlElementAttributeValue( expression, "slot", pciDevice );
this.setXmlElementAttributeValue( expression, "function", pciFunction );
}
@Override
public HostdevPciDeviceAddress getSource()
{
return this.getPciAddress( "source/address" );
}
@Override
public void setSource( HostdevPciDeviceAddress address )
{
this.setPciAddress( "source/address", address );
}
@Override
public HostdevPciDeviceAddress getTarget()
{
return this.getPciAddress( "address" );
}
@Override
public void setTarget( HostdevPciDeviceAddress address )
{
this.setPciAddress( "address", address );
}
/**
* Creates a non-existent hostdev PCI device as Libvirt XML device element.
*
* @param xmlNode Libvirt XML node of the Libvirt XML device that is created.
* @return created hostdev PCI device instance.
*/
public static HostdevPci createInstance( LibvirtXmlNode xmlNode )
{
return HostdevPci.newInstance( xmlNode );
}
/**
* Creates a hostdev PCI device representing an existing Libvirt XML hostdev PCI device element.
*
* @param xmlNode existing Libvirt XML hostdev PCI device element.
* @return hostdev PCI device instance.
*/
public static HostdevPci newInstance( LibvirtXmlNode xmlNode )
{
return new HostdevPci( xmlNode );
}
}
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