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package cgeo.geocaching.sensors;
import cgeo.geocaching.CgeoApplication;
import cgeo.geocaching.settings.Settings;
import org.apache.commons.lang3.tuple.ImmutablePair;
import rx.Subscription;
import rx.android.schedulers.AndroidSchedulers;
import rx.functions.Action1;
/**
* GeoData and Direction handler.
* <p>
* To use this class, override {@link #updateGeoDir(IGeoData, float)}. You need to start the handler using
* {@link #start()}. A good place to do so might be the {@code onResume} method of the Activity. Stop the Handler
* accordingly in {@code onPause}.
*/
public abstract class GeoDirHandler {
private static final CgeoApplication app = CgeoApplication.getInstance();
/**
* Update method called when new data is available.
*
* @param geoData the new geographical data
* @param direction the new direction
*
* If the device goes fast enough, or if the compass use is not enabled in the settings,
* the GPS direction information will be used instead of the compass one.
*/
public void updateGeoDir(@SuppressWarnings("unused") final IGeoData geoData, @SuppressWarnings("unused") final float direction) {
}
private void handleGeoDir(final ImmutablePair<IGeoData, Float> geoDir) {
final IGeoData geoData = geoDir.left;
final boolean useGPSBearing = !Settings.isUseCompass() || geoData.getSpeed() > 5;
updateGeoDir(geoData, useGPSBearing ? geoData.getBearing() : geoDir.right);
}
/**
* Register the current GeoDirHandler for GeoData and direction information (if the
* preferences allow it).
*/
public Subscription start() {
return app.geoDirObservable().subscribe(new Action1<ImmutablePair<IGeoData, Float>>() {
@Override
public void call(final ImmutablePair<IGeoData, Float> geoDir) {
handleGeoDir(geoDir);
}
}, AndroidSchedulers.mainThread());
}
}
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