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package cgeo.geocaching.utils;
import cgeo.geocaching.CgeoApplication;
import cgeo.geocaching.IGeoData;
import cgeo.geocaching.settings.Settings;
import rx.Subscription;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;
import rx.util.functions.Action0;
import rx.util.functions.Action1;
import java.util.concurrent.TimeUnit;
/**
* GeoData and Direction handler.
* <p>
* To use this class, override at least one of {@link #updateDirection(float)} or {@link #updateGeoData(IGeoData)}. You
* need to start the handler using one of
* <ul>
* <li>{@link #startDir()}</li>
* <li>{@link #startGeo()}</li>
* <li>{@link #startGeoAndDir()}</li>
* </ul>
* A good place might be the {@code onResume} method of the Activity. Stop the Handler accordingly in {@code onPause}.
* </p>
*/
public abstract class GeoDirHandler {
private static final CgeoApplication app = CgeoApplication.getInstance();
private Subscription dirSubscription = null;
private Subscription geoSubscription = null;
/**
* Update method called when new IGeoData is available.
*
* @param data
* the new data
*/
public void updateGeoData(final IGeoData data) {
// Override this in children
}
/**
* Update method called when new direction data is available.
*
* @param direction
* the new direction
*/
public void updateDirection(final float direction) {
// Override this in children
}
/**
* Register the current GeoDirHandler for GeoData information.
*/
public synchronized void startGeo() {
geoSubscription = app.currentGeoObject()
.subscribeOn(AndroidSchedulers.mainThread())
.subscribe(new Action1<IGeoData>() {
@Override
public void call(final IGeoData geoData) {
updateGeoData(geoData);
}
});
}
/**
* Register the current GeoDirHandler for direction information if the preferences
* allow it.
*/
public synchronized void startDir() {
if (Settings.isUseCompass()) {
dirSubscription = app.currentDirObject()
.subscribeOn(AndroidSchedulers.mainThread())
.subscribe(new Action1<Float>() {
@Override
public void call(final Float direction) {
updateDirection(direction);
}
});
}
}
/**
* Register the current GeoDirHandler for GeoData and direction information (if the
* preferences allow it).
*/
public void startGeoAndDir() {
startGeo();
startDir();
}
/**
* Unregister the current GeoDirHandler for GeoData information.
*/
public synchronized void stopGeo() {
// Delay the unsubscription by 2.5 seconds, so that another activity has
// the time to subscribe and the GPS receiver will not be turned down.
if (geoSubscription != null) {
final Subscription subscription = geoSubscription;
geoSubscription = null;
Schedulers.newThread().schedule(new Action0() {
@Override
public void call() {
subscription.unsubscribe();
}
}, 2500, TimeUnit.MILLISECONDS);
}
}
/**
* Unregister the current GeoDirHandler for direction information.
*/
public synchronized void stopDir() {
if (dirSubscription != null) {
dirSubscription.unsubscribe();
dirSubscription = null;
}
}
/**
* Unregister the current GeoDirHandler for GeoData and direction information.
*/
public void stopGeoAndDir() {
stopGeo();
stopDir();
}
}
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