112 lines
2.4 KiB
Java
112 lines
2.4 KiB
Java
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/**
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* A simple implementation which adds noise to the location component of the
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* data that is produced by the "DemoLocation" sensing task.
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*/
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import java.util.*;
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import java.io.*;
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import android.content.Context;
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import android.util.*;
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@SuppressWarnings("unchecked")
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public class DemoFilterLocation {
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private static Context context;
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private static int pref;
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private static List <Object> state;
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public void onStart (Context c, int i, ObjectInputStream ois) throws Exception {
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String TAG = getClass().getName() + "@onStart: ";
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Log.wtf(TAG, "...");
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// Get application context.
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context = c;
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// Get privacy preferences.
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pref = i;
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// Restore state.
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if (ois != null) {
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Log.wtf(TAG, "Restoring state...");
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state = (List<Object>) ois.readObject();
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} else {
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Log.wtf(TAG, "Initializing state...");
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state = new ArrayList<>();
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}
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}
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public void onStop () {
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String TAG = getClass().getName() + "@onStop: ";
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Log.wtf(TAG, "...");
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}
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public void onPreferenceChanged (int i) {
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String TAG = getClass().getName() + "@onPreferenceChanged: ";
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Log.wtf(TAG, "" + i);
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pref = i;
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}
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public boolean saveState (ObjectOutputStream oos) throws Exception {
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String TAG = getClass().getName() + "@saveState: ";
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Log.wtf(TAG, "...");
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// s.writeObject(state);
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return false;
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}
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public int processData (ObjectInputStream ois, ObjectOutputStream oos) throws Exception {
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String TAG = getClass().getName() + "@processData: ";
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Log.wtf(TAG, "...");
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// Get list of data.
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List <Object> list = (List<Object>) ois.readObject();
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// Edit each data entry of the data list.
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for (Object o : list) {
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Map data = (Map) o;
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data.put("device", data.get("device"));
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data.put("task", data.get("task"));
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data.put("sensor", data.get("sensor"));
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data.put("timestamp", data.get("timestamp"));
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double[] location = (double[]) data.get("values");
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double x0 = location[0]; // lat
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double y0 = location[1]; // lng
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double r = (double) pref * 10 / 111300;
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double w = r * Math.sqrt(Math.random());
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double t = 2 * Math.PI * Math.random();
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double x = w * Math.cos(t);
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double y = w * Math.sin(t);
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double x1 = x / Math.cos(y0);
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double values[] = {x1 + x0, y + y0};
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data.put("values", values);
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}
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oos.writeObject(list);
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return 0;
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}
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}
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