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/**
* Implementation of ITS Basic Transport Protocol layer
*
* @author ETSI / STF424
* @version $URL$
* $Id$
*
*/
package org.etsi.its.adapter.layers;
import java.util.HashMap;
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import java.util.Map;
import java.util.Stack;
import org.etsi.common.ByteHelper;
import org.etsi.its.adapter.IManagementLayers;
/**
* Implementation of ITS Basic Transport Protocol layer
*/
public class BtpLayer extends Layer {
/**
* Parameter name for BTP packet type
*/
public static final String BTP_TYPE = "BtpType";
/**
* Parameter name for BTP destination port
*/
public static final String BTP_DSTPORT = "BtpDstPort";
/**
* Parameter name for BTP source port
*/
public static final String BTP_SRCPORT = "BtpSrcPort";
/**
* Parameter name for BTP destination port information
*/
public static final String BTP_DSTPORTINFO = "BtpDstPortInfo";
/**
* BTP packet type A
*/
public static final int TYPE_A = 0;
/**
* BTP packet type B
*/
public static final int TYPE_B = 1;
/**
* Constructor
* @param management Layer management instance
* @param lowerStack Lower protocol stack
*/
public BtpLayer(IManagementLayers management, Stack<String> lowerStack) {
super(management, lowerStack);
}
/* (non-Javadoc)
* @see org.etsi.its.adapter.layers.Layer#send(byte[], java.util.Map)
*/
@Override
public boolean send(byte[] message, Map<String, Object> params) {
// Destination Port (16 bits)
int dstPort;
try {
dstPort = (Integer)params.get(BTP_DSTPORT);
}
catch (NullPointerException e) {
dstPort = 0;
}
byte[] encapsulated = ByteHelper.intToByteArray(dstPort, 2);
if(params.get(BTP_TYPE).equals(TYPE_A)) {
// Source Port (16 bits)
int srcPort;
try {
srcPort = (Integer)params.get(BTP_SRCPORT);
}
catch (NullPointerException e) {
srcPort = 0;
}
encapsulated = ByteHelper.concat(encapsulated, ByteHelper.intToByteArray(srcPort, 2));
}
else {
// Destination port info (16 bits)
int dstPortInfo;
try {
dstPortInfo = (Integer)params.get(BTP_DSTPORTINFO);
}
catch (NullPointerException e) {
dstPortInfo = 0;
}
encapsulated = ByteHelper.concat(encapsulated, ByteHelper.intToByteArray(dstPortInfo, 2));
}
// Update params
// if(lowerLayerName != null && lowerLayerName.equals("GN")) {
// params.put(GnLayer.GN_NEXTHEADER, "BTP-A"); // TODO Alex to confirm removal
// }
return super.send(ByteHelper.concat(encapsulated, message), params);
}
/* (non-Javadoc)
* @see org.etsi.its.adapter.layers.Layer#receive(byte[])
*/
@Override
public void receive(byte[] message, Map<String, Object> lowerInfo) {
byte[] dstPort = new byte[2];
System.arraycopy(message, 0, dstPort, 0, 2);
byte[] srcPort = new byte[2];
System.arraycopy(message, 2, srcPort, 0, 2);
int payloadLength = message.length - 4;
byte[] payload = new byte[payloadLength];
System.arraycopy(message, 4, payload, 0, payloadLength);
lowerInfo.put(BTP_DSTPORT, dstPort);
lowerInfo.put(BTP_DSTPORTINFO, srcPort);
super.receive(payload, lowerInfo);
}
}