/**
* encodes the heartRateTrace to binary format (byte-array)
*
* @param trace the given trace (as list) to get the byteArray from
* @return a byteArray representing the heartRateTrace
*/
public static byte[] encodeHeartRateTrace(List<HeartRateData> trace) {
if (trace == null || trace.size() == 0) {
return new byte[0];
}
DataOutputStream os = null;
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
os = new DataOutputStream(bos);
os.writeInt(trace.size());
for (HeartRateData data : trace) {
os.writeLong(data.getRuntime());
os.writeByte(data.getHeartRate());
}
return bos.toByteArray();
} catch (Exception e) {
Log.e(TAG, "Can't encode heart rate trace: ", e);
return new byte[0];
}
}
/**
* decodes the heartRateTrace from binary format to a list of heartRateData's NOTE: the gpsTrace
* and heartRateTrace are stored as binary format in the database
*
* @param b the byteArray representing the heartRateTrace
* @return the heartRateTrace (a list of heartRateData's)
*/
public static List<HeartRateData> decodeHeartRateTrace(byte[] b) {
List<HeartRateData> trace = new Vector<HeartRateData>();
if (b == null || b.length == 0) {
return trace;
}
HeartRateData data = null;
try {
ByteArrayInputStream bis = new ByteArrayInputStream(b);
DataInputStream is = new DataInputStream(bis);
int num = is.readInt();
for (int i = 0; i < num; i++) {
data = new HeartRateData();
data.setRuntime(is.readLong());
data.setHeartRate(is.readByte() & 0xFF);
trace.add(data);
}
} catch (Exception e) {
Log.e(TAG, "Can't decode heart rate trace: ", e);
}
return trace;
}