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GeoFire is an open-source library for Android/Java that allows you to store and query a set of keys based on their geographic location.
/*
* Firebase GeoFire Java Library
*
* Copyright © 2014 Firebase - All Rights Reserved
* https://www.firebase.com
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binaryform must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY FIREBASE AS IS AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL FIREBASE BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.firebase.geofire;
import com.firebase.geofire.core.GeoHash;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.ValueEventListener;
import com.google.firebase.database.GenericTypeIndicator;
import java.lang.Throwable;
import java.util.*;
/**
* A GeoFire instance is used to store geo location data in Firebase.
*/
public class GeoFire {
/**
* A listener that can be used to be notified about a successful write or an error on writing.
*/
public static interface CompletionListener {
/**
* Called once a location was successfully saved on the server or an error occurred. On success, the parameter
* error will be null; in case of an error, the error will be passed to this method.
*
* @param key The key whose location was saved
* @param error The error or null if no error occurred
*/
public void onComplete(String key, DatabaseError error);
}
/**
* A small wrapper class to forward any events to the LocationEventListener.
*/
private static class LocationValueEventListener implements ValueEventListener {
private final LocationCallback callback;
LocationValueEventListener(LocationCallback callback) {
this.callback = callback;
}
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.getValue() == null) {
this.callback.onLocationResult(dataSnapshot.getKey(), null);
} else {
GeoLocation location = GeoFire.getLocationValue(dataSnapshot);
if (location != null) {
this.callback.onLocationResult(dataSnapshot.getKey(), location);
} else {
String message = "GeoFire data has invalid format: " + dataSnapshot.getValue();
this.callback.onCancelled(DatabaseError.fromException(new Throwable(message)));
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
this.callback.onCancelled(databaseError);
}
}
static GeoLocation getLocationValue(DataSnapshot dataSnapshot) {
try {
GenericTypeIndicator> typeIndicator = new GenericTypeIndicator>() {};
Map data = dataSnapshot.getValue(typeIndicator);
List location = (List) data.get("l");
Number latitudeObj = (Number) location.get(0);
Number longitudeObj = (Number) location.get(1);
double latitude = latitudeObj.doubleValue();
double longitude = longitudeObj.doubleValue();
if (location.size() == 2 && GeoLocation.coordinatesValid(latitude, longitude)) {
return new GeoLocation(latitude, longitude);
} else {
return null;
}
} catch (NullPointerException e) {
return null;
} catch (ClassCastException e) {
return null;
}
}
private final DatabaseReference databaseReference;
private final EventRaiser eventRaiser;
/**
* Creates a new GeoFire instance at the given Firebase reference.
*
* @param databaseReference The Firebase reference this GeoFire instance uses
*/
public GeoFire(DatabaseReference databaseReference) {
this.databaseReference = databaseReference;
EventRaiser eventRaiser;
try {
eventRaiser = new AndroidEventRaiser();
} catch (Throwable e) {
// We're not on Android, use the ThreadEventRaiser
eventRaiser = new ThreadEventRaiser();
}
this.eventRaiser = eventRaiser;
}
/**
* @return The Firebase reference this GeoFire instance uses
*/
public DatabaseReference getDatabaseReference() {
return this.databaseReference;
}
DatabaseReference getDatabaseRefForKey(String key) {
return this.databaseReference.child(key);
}
/**
* Sets the location for a given key.
*
* @param key The key to save the location for
* @param location The location of this key
*/
public void setLocation(String key, GeoLocation location) {
this.setLocation(key, location, null);
}
/**
* Sets the location for a given key.
*
* @param key The key to save the location for
* @param location The location of this key
* @param completionListener A listener that is called once the location was successfully saved on the server or an
* error occurred
*/
public void setLocation(final String key, final GeoLocation location, final CompletionListener completionListener) {
if (key == null) {
throw new NullPointerException();
}
DatabaseReference keyRef = this.getDatabaseRefForKey(key);
GeoHash geoHash = new GeoHash(location);
Map updates = new HashMap();
updates.put("g", geoHash.getGeoHashString());
updates.put("l", Arrays.asList(location.latitude, location.longitude));
if (completionListener != null) {
keyRef.setValue(updates, geoHash.getGeoHashString(), new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
completionListener.onComplete(key, databaseError);
}
});
} else {
keyRef.setValue(updates, geoHash.getGeoHashString());
}
}
/**
* Removes the location for a key from this GeoFire.
*
* @param key The key to remove from this GeoFire
*/
public void removeLocation(String key) {
this.removeLocation(key, null);
}
/**
* Removes the location for a key from this GeoFire.
*
* @param key The key to remove from this GeoFire
* @param completionListener A completion listener that is called once the location is successfully removed
* from the server or an error occurred
*/
public void removeLocation(final String key, final CompletionListener completionListener) {
if (key == null) {
throw new NullPointerException();
}
DatabaseReference keyRef = this.getDatabaseRefForKey(key);
if (completionListener != null) {
keyRef.setValue(null, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
completionListener.onComplete(key, databaseError);
}
});
} else {
keyRef.setValue(null);
}
}
/**
* Gets the current location for a key and calls the callback with the current value.
*
* @param key The key whose location to get
* @param callback The callback that is called once the location is retrieved
*/
public void getLocation(String key, LocationCallback callback) {
DatabaseReference keyRef = this.getDatabaseRefForKey(key);
LocationValueEventListener valueListener = new LocationValueEventListener(callback);
keyRef.addListenerForSingleValueEvent(valueListener);
}
/**
* Returns a new Query object centered at the given location and with the given radius.
*
* @param center The center of the query
* @param radius The radius of the query, in kilometers
* @return The new GeoQuery object
*/
public GeoQuery queryAtLocation(GeoLocation center, double radius) {
return new GeoQuery(this, center, radius);
}
void raiseEvent(Runnable r) {
this.eventRaiser.raiseEvent(r);
}
}