/**
* Internal helper method to aid in the subclass architecture. Overwrites the superclass method
* and calls it internally.
*
* @param header
* @param s
*/
protected void sentenceChooser(String header, String s) {
if (header.equals(RMCSentence.HEADER)) {
rmcSentence.setSentence(s);
notifyListeners(this.rmcSentence);
} else if (header.equals(GSVSentence.HEADER)) {
// TODO: I wonder what happens if say 2 of 4 are received and parse is called?
// Because 2 would be new data, 2 would be old data.
// Can't happen because parse() only called when not null.
// BUT what if it is in the middle of parsing and new data comes in?
// Solution: Sync GSVSentence.parse()? checkRefresh() is already synced though.
// 0. Get StringTokenizer to read info from NMEASentence:
StringTokenizer st = new StringTokenizer(s, ",");
st.nextToken(); // Skip header $GPGSV
// 1.1 Find out how many sentences in sequence.
gsvSentenceTotal = Integer.parseInt(st.nextToken());
// 1.2 Find out which sentence this is.
gsvSentenceNumber = Integer.parseInt(st.nextToken());
// 2. Assign sentence to GSVSentence in order.
gsvSentence.setSentence(s, gsvSentenceNumber, gsvSentenceTotal);
// 3. If last sentence:
if (gsvSentenceTotal == gsvSentenceNumber) {
// 3a. setSentence() to last one so it is not null
gsvSentence.setSentence(s);
// 3b. Notify GPSListener
notifyListeners(this.gsvSentence);
}
} else super.sentenceChooser(header, s); // Check superclass sentences.
}
/**
* Get NMEA Satellite. The satellite list is retrieved from the almanac data. Satellites are
* ordered by their elevation: highest elevation (index 0) -> lowest elevation.
*
* @param index the satellite index
* @return the NMEASaltellite object for the selected satellite
*/
public Satellite getSatellite(int index) {
Satellite s = gsvSentence.getSatellite(index);
// Compare getPRN() with this satellite, fill in setTracked():
// TODO: This fails because most satellites are set to 0 when this is called. Not synced yet.
boolean tracked = false;
int[] prns = getPRN();
for (int i = 0; i < prns.length; i++) {
if (prns[i] == s.getPRN()) tracked = true;
break;
}
s.setTracked(tracked);
return s;
}
/**
* The satellites in view is a list of satellites the GPS could theoretically connect to (i.e.
* satellites that are not over the earth's horizon). The getSatellitesInView() method will always
* return an equal or greater number than getSatellitesTracked().
*
* @return Number of satellites e.g. 8
*/
public int getSatellitesInView() {
return gsvSentence.getSatellitesInView();
}
