/**
* Handles the packet specified, and forward packet to the responsible chained handler once done.
* In this case, the handler parses the packet and creates a <code>GOOSEMessage</code>
*
* @param packet the packet to parse to create the <code>GOOSEMessage</code>
*/
@Override
public void handlePacket(JPacket packet) {
Ethernet ethernetHeader = new Ethernet();
if (packet.hasHeader(ethernetHeader)) {
// If it's not a 61850 message then don't handle the packet
if (ethernetHeader.type() != GOOSEMessage.GOOSE_MSG) {
return;
}
try {
if (gooseMessage == null) {
gooseMessage = new GOOSEMessage();
}
gooseMessage.init();
// set destination and source mac
gooseMessage.setDst(ethernetHeader.destination());
gooseMessage.setSrc(ethernetHeader.source());
// set ethernet type
switch (ethernetHeader.type()) {
case GOOSEMessage.GOOSE_MSG: // GOOSE
gooseMessage.setMessageType(GOOSEMessage.GOOSE_MESSAGE);
// set goose payload
byte[] payload = ethernetHeader.getPayload();
GOOSEMessageGoosePDU goosePDU = GOOSEMessageGoosePDU.getInstance(payload, 8);
// GOOSEMessageGoosePDU goosePDU = GOOSEMessageGoosePDU.getInstance(
// payload, 7 );
gooseMessage.setAPDU(goosePDU);
break;
case GOOSEMessage.GSE_MGMT_MSG: // GSE
gooseMessage.setMessageType(GOOSEMessage.GSE_MANAGEMENT_MESSAGE);
// TODO: handle GSE management message
break;
case GOOSEMessage.SVM_MSG: // SVM
gooseMessage.setMessageType(GOOSEMessage.SV_MESSAGE);
// TODO: handle SVM message
break;
default: // not GOOSE traffic so ignore the frame
gooseMessage = null;
return;
}
} catch (MessageException me) {
// TODO - write error message
return;
}
}
// chain to next handler
if (this._handler != null) {
this._handler.handlePacket(packet);
}
return;
}
