Android Open Source - interdroid-swan Monitor Thread

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License

The source code is released under:

Copyright (c) 2008-2011 Vrije Universiteit, The Netherlands All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the follo...

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Java Source Code

package interdroid.swan.sensors;
/*from w w w .  j  a va 2  s.co m*/
import java.util.Map;

import android.content.ContentValues;

public class MonitorThread extends Thread {

  private AbstractCuckooSensor sensor;
  private String valuePath;
  private Map<String, Object> configuration;
  volatile boolean shouldStop = false;

  public MonitorThread(AbstractCuckooSensor sensor, final String valuePath,
      final Map<String, Object> configuration) {
    this.sensor = sensor;
    this.valuePath = valuePath;
    this.configuration = configuration;
  }

  public void run() {
    Map<String, Object> previous = null;
    while (!shouldStop) {
      Map<String, Object> values = sensor.getPoller().poll(valuePath,
          configuration);
      if (changed(previous, values)) {
        System.out.println("change! " + previous + " -> " + values);
        previous = values;
        sensor.putValues(toContentValues(values),
            System.currentTimeMillis());
      }
      try {
        sleep(sensor.getPoller().getInterval(configuration, false));
      } catch (InterruptedException e) {
        // ignore, we will exit the loop anyways
      }
    }
  }

  private boolean changed(Map<String, Object> old, Map<String, Object> current) {
    if (current == null) {
      // new values are not valid
      return false;
    } else if (old == null) {
      // old values were invalid
      return true;
    } else {
      for (String key : old.keySet()) {
        if (!old.get(key).equals(current.get(key))) {
          // yes, we found a change
          return true;
        }
      }
    }
    return false;
  }

  private ContentValues toContentValues(Map<String, Object> map) {
    ContentValues values = new ContentValues();
    for (String key : map.keySet()) {
      Object value = map.get(key);
      if (value instanceof Boolean) {
        values.put(key, (Boolean) value);
      } else if (value instanceof Byte) {
        values.put(key, (Byte) value);
      } else if (value instanceof byte[]) {
        values.put(key, (byte[]) value);
      } else if (value instanceof Double) {
        values.put(key, (Double) value);
      } else if (value instanceof Float) {
        values.put(key, (Float) value);
      } else if (value instanceof Integer) {
        values.put(key, (Integer) value);
      } else if (value instanceof Long) {
        values.put(key, (Long) value);
      } else if (value instanceof Short) {
        values.put(key, (Short) value);
      } else if (value instanceof String) {
        values.put(key, (String) value);
      } else {
        throw new RuntimeException(
            "Impossible to convert type in map to contentvalues: "
                + value);
      }
    }
    return values;
  }

}

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