private void loadDefaultModelMap() {
mModelMap = new HashMap<AndroidModel, DistanceCalculator>();
try {
buildModelMap(stringFromFilePath(CONFIG_FILE));
} catch (Exception e) {
LogManager.e(e, TAG, "Cannot build model distance calculations");
}
}
/**
* Estimate the distance to the beacon using the DistanceCalculator set on this class. If no
* DistanceCalculator has been set, return -1 as the distance.
*
* @see org.altbeacon.beacon.distance.DistanceCalculator
* @param txPower
* @param bestRssiAvailable
* @return
*/
protected static Double calculateDistance(int txPower, double bestRssiAvailable) {
if (Beacon.getDistanceCalculator() != null) {
return Beacon.getDistanceCalculator().calculateDistance(txPower, bestRssiAvailable);
} else {
LogManager.e(TAG, "Distance calculator not set. Distance will bet set to -1");
return -1.0;
}
}
private boolean loadModelMapFromFile() {
File file = new File(mContext.getFilesDir(), CONFIG_FILE);
FileInputStream inputStream = null;
BufferedReader reader = null;
StringBuilder sb = new StringBuilder();
try {
inputStream = new FileInputStream(file);
reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
sb.append(line).append("\n");
}
} catch (FileNotFoundException fnfe) {
// This occurs on the first time the app is run, no error message necessary.
return false;
} catch (IOException e) {
LogManager.e(e, TAG, "Cannot open distance model file %s", file);
return false;
} finally {
if (reader != null) {
try {
reader.close();
} catch (Exception e2) {
}
}
if (inputStream != null) {
try {
inputStream.close();
} catch (Exception e2) {
}
}
}
try {
buildModelMap(sb.toString());
return true;
} catch (JSONException e) {
LogManager.e(
TAG,
"Cannot update distance models from online database at %s with JSON",
e,
mRemoteUpdateUrlString,
sb.toString());
return false;
}
}