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/**
* Implementation of Ethernet layer using jpcap (background thread)
*
* @author ETSI / STF424
* @version $URL$
* $Id$
*
*/
package org.etsi.its.adapter.layers;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.Stack;
import org.etsi.its.adapter.IManagementLayers;
import org.etsi.its.adapter.PcapMultiplexer;
/**
* Implementation of Ethernet layer using jpcap (background thread)
*/
public class EthernetLayer extends Layer {
/**
* Well-known Ethernet broadcast address
*/
public static byte[] MAC_BROADCAST = new byte[]{(byte)0xFF,(byte)0xFF,(byte)0xFF,(byte)0xFF,(byte)0xFF,(byte)0xFF};
/**
* Parameter name for Link-Layer destination
*/
public static final String LINK_LAYER_DESTINATION = "LinkLayerDestination";
/**
* Constructor
* @param management Layer management instance
* @param lowerStack Lower protocol stack
*/
public EthernetLayer(IManagementLayers management, Stack<String> lowerStack) {
super(management, lowerStack);
}
/* (non-Javadoc)
* @see org.etsi.its.adapter.layers.Layer#register(org.etsi.its.adapter.layers.Layer)
*/
@Override
public void register(Layer upperLayer) {
if(registeredUpperLayer == null) {
super.register(upperLayer);
try {
Method getEthernetType = registeredUpperLayer.getClass().getMethod("getEthernetType", (Class<?>[])null);
if (getEthernetType != null) {
upperLayerFrameType = (Short) getEthernetType.invoke(registeredUpperLayer, (Object[]) null);
}
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
localMacAddress = management.getLinkLayerAddress();
PcapMultiplexer.getInstance().register(this, localMacAddress, upperLayerFrameType);
}
}
/* (non-Javadoc)
* @see org.etsi.its.adapter.layers.Layer#send(byte[], java.util.Map)
*/
@Override
public boolean send(byte[] message, Map<String, Object> params) {
byte[] dst = (byte[])params.get(LINK_LAYER_DESTINATION);
if(dst == null) {
dst = MAC_BROADCAST;
}
byte[] sent = PcapMultiplexer.getInstance().sendPacket(this, dst, message);
return super.send(sent, params);
}
/* (non-Javadoc)
* @see org.etsi.its.adapter.layers.Layer#unregister(org.etsi.its.adapter.layers.Layer)
*/
@Override
public void unregister(Layer upperLayer) {
PcapMultiplexer.getInstance().unregister(this);
}
/**
* Local Ethernet address
*/
private byte[] localMacAddress;
/**
* Upper layer's frame type
*/
private short upperLayerFrameType;
}