1 files changed, 82 insertions, 0 deletions
diff --git a/main/src/cgeo/geocaching/location/AndroidGeocoder.java b/main/src/cgeo/geocaching/location/AndroidGeocoder.java
new file mode 100644
index 0000000..d0d07e8
--- /dev/null
+++ b/main/src/cgeo/geocaching/location/AndroidGeocoder.java
@@ -0,0 +1,82 @@
+package cgeo.geocaching.location;
+
+import cgeo.geocaching.utils.Log;
+import cgeo.geocaching.utils.RxUtils;
+
+import org.apache.commons.collections4.CollectionUtils;
+import org.eclipse.jdt.annotation.NonNull;
+
+import rx.Observable;
+import rx.functions.Func0;
+
+import android.content.Context;
+import android.location.Address;
+import android.location.Geocoder;
+
+import java.util.List;
+import java.util.Locale;
+
+public class AndroidGeocoder {
+    private final Geocoder geocoder;
+
+    public AndroidGeocoder(final Context context) {
+        geocoder = new Geocoder(context, Locale.getDefault());
+    }
+
+    /**
+     * Retrieve addresses from a textual location using Android geocoding API. The work happens on the network
+     * scheduler.
+     *
+     * @param keyword
+     *            the location
+     * @return an observable containing zero or more locations
+     *
+     * @see Geocoder#getFromLocationName(String, int)
+     */
+    public Observable<Address> getFromLocationName(@NonNull final String keyword) {
+        if (!Geocoder.isPresent()) {
+            return Observable.error(new RuntimeException("no Android geocoder"));
+        }
+        return Observable.defer(new Func0<Observable<Address>>() {
+            @Override
+            public Observable<Address> call() {
+                try {
+                    return addressesToObservable(geocoder.getFromLocationName(keyword, 20));
+                } catch (final Exception e) {
+                    Log.i("Unable to use Android reverse geocoder: " + e.getMessage());
+                    return Observable.error(e);
+                }
+            }
+        }).subscribeOn(RxUtils.networkScheduler);
+    }
+
+    /**
+     * Retrieve the physical address for coordinates. The work happens on the network scheduler.
+     *
+     * @param coords the coordinates
+     * @return an observable containing one location or an error
+     */
+    public Observable<Address> getFromLocation(@NonNull final Geopoint coords) {
+        if (!Geocoder.isPresent()) {
+            return Observable.error(new RuntimeException("no Android reverse geocoder"));
+        }
+        return Observable.defer(new Func0<Observable<Address>>() {
+            @Override
+            public Observable<Address> call() {
+                try {
+                    return addressesToObservable(geocoder.getFromLocation(coords.getLatitude(), coords.getLongitude(), 1));
+                } catch (final Exception e) {
+                    Log.i("Unable to use Android reverse geocoder: " + e.getMessage());
+                    return Observable.error(e);
+                }
+            }
+        }).subscribeOn(RxUtils.networkScheduler).first();
+    }
+
+    private static Observable<Address> addressesToObservable(final List<Address> addresses) {
+        return CollectionUtils.isEmpty(addresses) ?
+                Observable.<Address>error(new RuntimeException("no result from Android geocoder")) :
+                Observable.from(addresses);
+    }
+
+}