// generateReply is the heart of the simulation. It translates an
// incoming DCCppMessage into an outgoing DCCppReply.
@SuppressWarnings("fallthrough")
private DCCppReply generateReply(DCCppMessage msg) {
String s, r;
Pattern p;
Matcher m;
DCCppReply reply = null;
log.debug("Generate Reply to message type {} string = {}", msg.getElement(0), msg.toString());
switch (msg.getElement(0)) {
case DCCppConstants.THROTTLE_CMD:
log.debug("THROTTLE_CMD detected");
s = msg.toString();
try {
p = Pattern.compile(DCCppConstants.THROTTLE_CMD_REGEX);
m = p.matcher(s);
if (!m.matches()) {
log.error("Malformed Throttle Command: {}", s);
return (null);
}
r = "T " + m.group(1) + " " + m.group(3) + " " + m.group(4);
reply = DCCppReply.parseDCCppReply(r);
log.debug("Reply generated = {}", reply.toString());
} catch (PatternSyntaxException e) {
log.error("Malformed pattern syntax! ");
return (null);
} catch (IllegalStateException e) {
log.error("Group called before match operation executed string= " + s);
return (null);
} catch (IndexOutOfBoundsException e) {
log.error("Index out of bounds string= " + s);
return (null);
}
break;
case DCCppConstants.TURNOUT_CMD:
if (msg.isTurnoutAddMessage()) {
log.debug("Add Turnout Message");
r = "O";
} else if (msg.isTurnoutDeleteMessage()) {
log.debug("Delete Turnout Message");
r = "O";
} else if (msg.isListTurnoutsMessage()) {
log.debug("List Turnouts Message");
r = "H 1 27 3 1";
} else {
log.debug("TURNOUT_CMD detected");
r = "H" + msg.getTOIDString() + " " + msg.getTOStateString();
}
reply = DCCppReply.parseDCCppReply(r);
log.debug("Reply generated = {}", reply.toString());
break;
case DCCppConstants.SENSOR_CMD:
if (msg.isSensorAddMessage()) {
log.debug("SENSOR_CMD Add detected");
s = msg.toString();
r = "O"; // TODO: Randomize?
} else if (msg.isSensorDeleteMessage()) {
log.debug("SENSOR_CMD Delete detected");
s = msg.toString();
r = "O"; // TODO: Randomize?
} else if (msg.isListSensorsMessage()) {
r = "Q 1 4 1"; // TODO: DO this for real.
} else {
log.debug("Invalid SENSOR_CMD detected");
r = "X";
}
reply = DCCppReply.parseDCCppReply(r);
log.debug("Reply generated = {}", reply.toString());
break;
case DCCppConstants.PROG_WRITE_CV_BYTE:
log.debug("PROG_WRITE_CV_BYTE detected");
s = msg.toString();
try {
p = Pattern.compile(DCCppConstants.PROG_WRITE_BYTE_REGEX);
m = p.matcher(s);
if (!m.matches()) {
log.error("Malformed ProgWriteCVByte Command: {}", s);
return (null);
}
r = "r " + m.group(3) + " " + m.group(4) + " " + m.group(2);
CVs[Integer.parseInt(m.group(1))] = Integer.parseInt(m.group(2));
reply = DCCppReply.parseDCCppReply(r);
log.debug("Reply generated = {}", reply.toString());
} catch (PatternSyntaxException e) {
log.error("Malformed pattern syntax! ");
return (null);
} catch (IllegalStateException e) {
log.error("Group called before match operation executed string= " + s);
return (null);
} catch (IndexOutOfBoundsException e) {
log.error("Index out of bounds string= " + s);
return (null);
}
break;
case DCCppConstants.PROG_WRITE_CV_BIT:
log.debug("PROG_WRITE_CV_BIT detected");
s = msg.toString();
try {
p = Pattern.compile(DCCppConstants.PROG_WRITE_BIT_REGEX);
m = p.matcher(s);
if (!m.matches()) {
log.error("Malformed ProgWriteCVBit Command: {}", s);
return (null);
}
r = "r " + m.group(4) + " " + m.group(5) + " " + m.group(3);
int idx = Integer.parseInt(m.group(1));
int bit = Integer.parseInt(m.group(2));
int v = Integer.parseInt(m.group(3));
if (v == 1) CVs[idx] = CVs[idx] | (0x0001 << bit);
else CVs[idx] = CVs[idx] & ~(0x0001 << bit);
reply = DCCppReply.parseDCCppReply(r);
log.debug("Reply generated = {}", reply.toString());
} catch (PatternSyntaxException e) {
log.error("Malformed pattern syntax! ");
return (null);
} catch (IllegalStateException e) {
log.error("Group called before match operation executed string= " + s);
return (null);
} catch (IndexOutOfBoundsException e) {
log.error("Index out of bounds string= " + s);
return (null);
}
break;
case DCCppConstants.PROG_READ_CV:
log.debug("PROG_READ_CV detected");
s = msg.toString();
try {
p = Pattern.compile(DCCppConstants.PROG_READ_REGEX);
m = p.matcher(s);
if (!m.matches()) {
log.error("Malformed PROG_READ_CV Command: {}", s);
return (null);
}
// TODO: Work Magic Here to retrieve stored value.
int cv = CVs[Integer.parseInt(m.group(1))];
r = "r " + m.group(2) + " " + m.group(3) + " " + Integer.toString(cv);
reply = DCCppReply.parseDCCppReply(r);
log.debug("Reply generated = {}", reply.toString());
} catch (PatternSyntaxException e) {
log.error("Malformed pattern syntax! ");
return (null);
} catch (IllegalStateException e) {
log.error("Group called before match operation executed string= " + s);
return (null);
} catch (IndexOutOfBoundsException e) {
log.error("Index out of bounds string= " + s);
return (null);
}
break;
case DCCppConstants.TRACK_POWER_ON:
log.debug("TRACK_POWER_ON detected");
TrackPowerState = true;
reply = DCCppReply.parseDCCppReply("p1");
log.debug("Reply generated = {}", reply.toString());
break;
case DCCppConstants.TRACK_POWER_OFF:
log.debug("TRACK_POWER_OFF detected");
TrackPowerState = false;
reply = DCCppReply.parseDCCppReply("p0");
log.debug("Reply generated = {}", reply.toString());
break;
case DCCppConstants.READ_TRACK_CURRENT:
log.debug("READ_TRACK_CURRENT detected");
int randint = 480 + rgen.nextInt(64);
reply =
DCCppReply.parseDCCppReply("a " + (TrackPowerState ? Integer.toString(randint) : "0"));
log.debug("Reply generated = {}", reply.toString());
break;
case DCCppConstants.READ_CS_STATUS:
log.debug("READ_CS_STATUS detected");
generateReadCSStatusReply(); // Handle this special.
break;
/*
case DCCppConstants.QUERY_SENSOR_STATE:
// Obsolete ??
log.debug("QUERY_SENSOR_STATUS detected");
s = msg.toString();
try {
p = Pattern.compile(DCCppConstants.QUERY_SENSOR_REGEX);
m = p.matcher(s);
if (!m.matches()) {
log.error("Malformed Sensor Query Command: {}", s);
return(null);
}
r = "Q " + m.group(1) + " ";
// Fake reply: Odd sensors always active, even always inactive.
r += ((Integer.parseInt(m.group(1)) % 2) == 1 ? "1" : "0");
reply = new DCCppReply(r);
log.debug("Reply generated = {}", reply.toString());
} catch (PatternSyntaxException e) {
log.error("Malformed pattern syntax! ");
return(null);
} catch (IllegalStateException e) {
log.error("Group called before match operation executed string= " + s);
return(null);
} catch (IndexOutOfBoundsException e) {
log.error("Index out of bounds string= " + s);
return(null);
}
break;
*/
case DCCppConstants.FUNCTION_CMD:
case DCCppConstants.ACCESSORY_CMD:
case DCCppConstants.OPS_WRITE_CV_BYTE:
case DCCppConstants.OPS_WRITE_CV_BIT:
case DCCppConstants.WRITE_DCC_PACKET_MAIN:
case DCCppConstants.WRITE_DCC_PACKET_PROG:
log.debug("non-reply message detected");
// Send no reply.
return (null);
default:
return (null);
}
return (reply);
}
