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FirestackDatabase.java
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package io.fullstack.firestack;
import android.content.Context;
import android.util.Log;
import java.util.HashMap;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import android.net.Uri;
import com.facebook.react.bridge.Arguments;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.Callback;
import com.facebook.react.bridge.WritableMap;
import com.facebook.react.bridge.ReadableMap;
import com.facebook.react.bridge.ReadableMapKeySetIterator;
import com.facebook.react.bridge.ReadableArray;
import com.facebook.react.bridge.ReactContext;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.OnDisconnect;
import com.google.firebase.database.Query;
import com.google.firebase.database.ValueEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
class FirestackDBReference {
private static final String TAG = "FirestackDBReference";
private String mPath;
private ReadableArray mModifiers;
private HashMap<String, Boolean> mListeners = new HashMap<String, Boolean>();
private FirestackDatabaseModule mDatabase;
private ChildEventListener mEventListener;
private ValueEventListener mValueListener;
private ValueEventListener mOnceValueListener;
private ReactContext mReactContext;
public FirestackDBReference(final ReactContext context, final String path) {
mReactContext = context;
mPath = path;
}
public void setModifiers(final ReadableArray modifiers) {
mModifiers = modifiers;
}
public void addChildEventListener(final String name, final ReadableArray modifiers) {
final FirestackDBReference self = this;
if (mEventListener == null) {
mEventListener = new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String previousChildName) {
self.handleDatabaseEvent("child_added", mPath, dataSnapshot);
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String previousChildName) {
self.handleDatabaseEvent("child_changed", mPath, dataSnapshot);
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
self.handleDatabaseEvent("child_removed", mPath, dataSnapshot);
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String previousChildName) {
self.handleDatabaseEvent("child_moved", mPath, dataSnapshot);
}
@Override
public void onCancelled(DatabaseError error) {
self.handleDatabaseError(name, mPath, error);
}
};
}
Query ref = this.getDatabaseQueryAtPathAndModifiers(modifiers);
ref.addChildEventListener(mEventListener);
this.setListeningTo(mPath, name);
}
public void addValueEventListener(final String name, final ReadableArray modifiers) {
final FirestackDBReference self = this;
mValueListener = new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
self.handleDatabaseEvent("value", mPath, dataSnapshot);
}
@Override
public void onCancelled(DatabaseError error) {
self.handleDatabaseError("value", mPath, error);
}
};
Query ref = this.getDatabaseQueryAtPathAndModifiers(modifiers);
ref.addValueEventListener(mValueListener);
this.setListeningTo(mPath, "value");
}
public void addOnceValueEventListener(final ReadableArray modifiers,
final Callback callback) {
final FirestackDBReference self = this;
mOnceValueListener = new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
WritableMap data = FirestackUtils.dataSnapshotToMap("value", mPath, dataSnapshot);
callback.invoke(null, data);
}
@Override
public void onCancelled(DatabaseError error) {
WritableMap err = Arguments.createMap();
err.putInt("errorCode", error.getCode());
err.putString("errorDetails", error.getDetails());
err.putString("description", error.getMessage());
callback.invoke(err);
}
};
Query ref = this.getDatabaseQueryAtPathAndModifiers(modifiers);
ref.addListenerForSingleValueEvent(mOnceValueListener);
}
public Boolean isListeningTo(final String path, final String evtName) {
String key = this.pathListeningKey(path, evtName);
return mListeners.containsKey(key);
}
/**
* Note: these path/eventType listeners only get removed when javascript calls .off() and cleanup is run on the entire path
*/
public void setListeningTo(final String path, final String evtName) {
String key = this.pathListeningKey(path, evtName);
mListeners.put(key, true);
}
public void notListeningTo(final String path, final String evtName) {
String key = this.pathListeningKey(path, evtName);
mListeners.remove(key);
}
private String pathListeningKey(final String path, final String eventName) {
return "listener/" + path + "/" + eventName;
}
public void cleanup() {
Log.d(TAG, "cleaning up database reference " + this);
this.removeChildEventListener();
this.removeValueEventListener();
}
public void removeChildEventListener() {
if (mEventListener != null) {
DatabaseReference ref = this.getDatabaseRef();
ref.removeEventListener(mEventListener);
this.notListeningTo(mPath, "child_added");
this.notListeningTo(mPath, "child_changed");
this.notListeningTo(mPath, "child_removed");
this.notListeningTo(mPath, "child_moved");
mEventListener = null;
}
}
public void removeValueEventListener() {
DatabaseReference ref = this.getDatabaseRef();
if (mValueListener != null) {
ref.removeEventListener(mValueListener);
this.notListeningTo(mPath, "value");
mValueListener = null;
}
if (mOnceValueListener != null) {
ref.removeEventListener(mOnceValueListener);
mOnceValueListener = null;
}
}
private void handleDatabaseEvent(final String name, final String path, final DataSnapshot dataSnapshot) {
if (!FirestackDBReference.this.isListeningTo(path, name)) {
return;
}
WritableMap data = FirestackUtils.dataSnapshotToMap(name, path, dataSnapshot);
WritableMap evt = Arguments.createMap();
evt.putString("eventName", name);
evt.putString("path", path);
evt.putMap("body", data);
FirestackUtils.sendEvent(mReactContext, "database_event", evt);
}
private void handleDatabaseError(final String name, final String path, final DatabaseError error) {
WritableMap err = Arguments.createMap();
err.putInt("errorCode", error.getCode());
err.putString("errorDetails", error.getDetails());
err.putString("description", error.getMessage());
WritableMap evt = Arguments.createMap();
evt.putString("eventName", name);
evt.putString("path", path);
evt.putMap("body", err);
FirestackUtils.sendEvent(mReactContext, "database_error", evt);
}
public DatabaseReference getDatabaseRef() {
return FirebaseDatabase.getInstance().getReference(mPath);
}
private Query getDatabaseQueryAtPathAndModifiers(final ReadableArray modifiers) {
DatabaseReference ref = this.getDatabaseRef();
List<Object> strModifiers = FirestackUtils.recursivelyDeconstructReadableArray(modifiers);
ListIterator<Object> it = strModifiers.listIterator();
Query query = ref.orderByKey();
while(it.hasNext()) {
String str = (String) it.next();
String[] strArr = str.split(":");
String methStr = strArr[0];
if (methStr.equalsIgnoreCase("orderByKey")) {
query = ref.orderByKey();
} else if (methStr.equalsIgnoreCase("orderByValue")) {
query = ref.orderByValue();
} else if (methStr.equalsIgnoreCase("orderByPriority")) {
query = ref.orderByPriority();
} else if (methStr.contains("orderByChild")) {
String key = strArr[1];
Log.d(TAG, "orderByChild: " + key);
query = ref.orderByChild(key);
} else if (methStr.contains("limitToLast")) {
String key = strArr[1];
int limit = Integer.parseInt(key);
Log.d(TAG, "limitToLast: " + limit);
query = query.limitToLast(limit);
} else if (methStr.contains("limitToFirst")) {
String key = strArr[1];
int limit = Integer.parseInt(key);
Log.d(TAG, "limitToFirst: " + limit);
query = query.limitToFirst(limit);
} else if (methStr.contains("equalTo")) {
String value = strArr[1];
String key = strArr.length >= 3 ? strArr[2] : null;
if (key == null) {
query = query.equalTo(value);
} else {
query = query.equalTo(value, key);
}
} else if (methStr.contains("endAt")) {
String value = strArr[1];
String key = strArr.length >= 3 ? strArr[2] : null;
if (key == null) {
query = query.endAt(value);
} else {
query = query.endAt(value, key);
}
} else if (methStr.contains("startAt")) {
String value = strArr[1];
String key = strArr.length >= 3 ? strArr[2] : null;
if (key == null) {
query = query.startAt(value);
} else {
query = query.startAt(value, key);
}
}
}
return query;
}
}
class FirestackDatabaseModule extends ReactContextBaseJavaModule {
private static final String TAG = "FirestackDatabase";
private Context context;
private ReactContext mReactContext;
private HashMap<String, FirestackDBReference> mDBListeners = new HashMap<String, FirestackDBReference>();
public FirestackDatabaseModule(ReactApplicationContext reactContext) {
super(reactContext);
this.context = reactContext;
mReactContext = reactContext;
}
@Override
public String getName() {
return TAG;
}
// Persistence
@ReactMethod
public void enablePersistence(
final Boolean enable,
final Callback callback) {
try {
FirebaseDatabase.getInstance()
.setPersistenceEnabled(enable);
} catch (Throwable t) {
Log.e(TAG, "FirebaseDatabase setPersistenceEnabled exception", t);
}
WritableMap res = Arguments.createMap();
res.putString("status", "success");
callback.invoke(null, res);
}
@ReactMethod
public void keepSynced(
final String path,
final Boolean enable,
final Callback callback) {
DatabaseReference ref = this.getDatabaseReferenceAtPath(path);
ref.keepSynced(enable);
WritableMap res = Arguments.createMap();
res.putString("status", "success");
res.putString("path", path);
callback.invoke(null, res);
}
// Database
@ReactMethod
public void set(
final String path,
final ReadableMap props,
final Callback callback) {
DatabaseReference ref = this.getDatabaseReferenceAtPath(path);
final FirestackDatabaseModule self = this;
Map<String, Object> m = FirestackUtils.recursivelyDeconstructReadableMap(props);
DatabaseReference.CompletionListener listener = new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError error, DatabaseReference ref) {
handleCallback("set", callback, error, ref);
}
};
ref.setValue(m, listener);
}
@ReactMethod
public void update(final String path,
final ReadableMap props,
final Callback callback) {
DatabaseReference ref = this.getDatabaseReferenceAtPath(path);
final FirestackDatabaseModule self = this;
Map<String, Object> m = FirestackUtils.recursivelyDeconstructReadableMap(props);
DatabaseReference.CompletionListener listener = new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError error, DatabaseReference ref) {
handleCallback("update", callback, error, ref);
}
};
ref.updateChildren(m, listener);
}
@ReactMethod
public void remove(final String path,
final Callback callback) {
DatabaseReference ref = this.getDatabaseReferenceAtPath(path);
final FirestackDatabaseModule self = this;
DatabaseReference.CompletionListener listener = new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError error, DatabaseReference ref) {
handleCallback("remove", callback, error, ref);
}
};
ref.removeValue(listener);
}
@ReactMethod
public void push(final String path,
final ReadableMap props,
final Callback callback) {
Log.d(TAG, "Called push with " + path);
DatabaseReference ref = this.getDatabaseReferenceAtPath(path);
DatabaseReference newRef = ref.push();
final Uri url = Uri.parse(newRef.toString());
final String newPath = url.getPath();
ReadableMapKeySetIterator iterator = props.keySetIterator();
if (iterator.hasNextKey()) {
Log.d(TAG, "Passed value to push");
// lame way to check if the `props` are empty
final FirestackDatabaseModule self = this;
Map<String, Object> m = FirestackUtils.recursivelyDeconstructReadableMap(props);
DatabaseReference.CompletionListener listener = new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError error, DatabaseReference ref) {
if (error != null) {
WritableMap err = Arguments.createMap();
err.putInt("errorCode", error.getCode());
err.putString("errorDetails", error.getDetails());
err.putString("description", error.getMessage());
callback.invoke(err);
} else {
WritableMap res = Arguments.createMap();
res.putString("status", "success");
res.putString("ref", newPath);
callback.invoke(null, res);
}
}
};
newRef.setValue(m, listener);
} else {
Log.d(TAG, "No value passed to push: " + newPath);
WritableMap res = Arguments.createMap();
res.putString("result", "success");
res.putString("ref", newPath);
callback.invoke(null, res);
}
}
@ReactMethod
public void on(final String path,
final ReadableArray modifiers,
final String name,
final Callback callback) {
FirestackDBReference ref = this.getDBHandle(path);
WritableMap resp = Arguments.createMap();
if (name.equals("value")) {
ref.addValueEventListener(name, modifiers);
} else {
ref.addChildEventListener(name, modifiers);
}
this.saveDBHandle(path, ref);
resp.putString("result", "success");
Log.d(TAG, "Added listener " + name + " for " + ref);
resp.putString("handle", path);
callback.invoke(null, resp);
}
@ReactMethod
public void onOnce(final String path,
final ReadableArray modifiers,
final String name,
final Callback callback) {
Log.d(TAG, "Setting one-time listener on event: " + name + " for path " + path);
FirestackDBReference ref = this.getDBHandle(path);
ref.addOnceValueEventListener(modifiers, callback);
}
/**
* At the time of this writing, off() only gets called when there are no more subscribers to a given path.
* `mListeners` might therefore be out of sync (though javascript isnt listening for those eventTypes, so
* it doesn't really matter- just polluting the RN bridge a little more than necessary.
* off() should therefore clean *everything* up
*/
@ReactMethod
public void off(final String path, @Deprecated final String name, final Callback callback) {
this.removeDBHandle(path);
Log.d(TAG, "Removed listener " + path);
WritableMap resp = Arguments.createMap();
resp.putString("handle", path);
resp.putString("result", "success");
callback.invoke(null, resp);
}
// On Disconnect
@ReactMethod
public void onDisconnectSetObject(final String path, final ReadableMap props, final Callback callback) {
DatabaseReference ref = this.getDatabaseReferenceAtPath(path);
Map<String, Object> m = FirestackUtils.recursivelyDeconstructReadableMap(props);
OnDisconnect od = ref.onDisconnect();
od.setValue(m, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
handleCallback("onDisconnectSetObject", callback, databaseError, databaseReference);
}
});
}
@ReactMethod
public void onDisconnectSetString(final String path, final String value, final Callback callback) {
DatabaseReference ref = this.getDatabaseReferenceAtPath(path);
OnDisconnect od = ref.onDisconnect();
od.setValue(value, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
handleCallback("onDisconnectSetString", callback, databaseError, databaseReference);
}
});
}
@ReactMethod
public void onDisconnectRemove(final String path, final Callback callback) {
DatabaseReference ref = this.getDatabaseReferenceAtPath(path);
OnDisconnect od = ref.onDisconnect();
od.removeValue(new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
handleCallback("onDisconnectRemove", callback, databaseError, databaseReference);
}
});
}
@ReactMethod
public void onDisconnectCancel(final String path, final Callback callback) {
DatabaseReference ref = this.getDatabaseReferenceAtPath(path);
OnDisconnect od = ref.onDisconnect();
od.cancel(new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
handleCallback("onDisconnectCancel", callback, databaseError, databaseReference);
}
});
}
// Private helpers
// private void handleDatabaseEvent(final String name, final DataSnapshot dataSnapshot) {
// WritableMap data = this.dataSnapshotToMap(name, dataSnapshot);
// WritableMap evt = Arguments.createMap();
// evt.putString("eventName", name);
// evt.putMap("body", data);
// FirestackUtils.sendEvent(mReactContext, "database_event", evt);
// }
// private void handleDatabaseError(final String name, final DatabaseError error) {
// WritableMap err = Arguments.createMap();
// err.putInt("errorCode", error.getCode());
// err.putString("errorDetails", error.getDetails());
// err.putString("description", error.getMessage());
// WritableMap evt = Arguments.createMap();
// evt.putString("eventName", name);
// evt.putMap("body", err);
// FirestackUtils.sendEvent(mReactContext, "database_error", evt);
// }
private void handleCallback(
final String methodName,
final Callback callback,
final DatabaseError databaseError,
final DatabaseReference databaseReference) {
if (databaseError != null) {
WritableMap err = Arguments.createMap();
err.putInt("errorCode", databaseError.getCode());
err.putString("errorDetails", databaseError.getDetails());
err.putString("description", databaseError.getMessage());
callback.invoke(err);
} else {
WritableMap res = Arguments.createMap();
res.putString("status", "success");
res.putString("method", methodName);
callback.invoke(null, res);
}
}
private FirestackDBReference getDBHandle(final String path) {
if (!mDBListeners.containsKey(path)) {
ReactContext ctx = getReactApplicationContext();
mDBListeners.put(path, new FirestackDBReference(ctx, path));
}
return mDBListeners.get(path);
}
private void saveDBHandle(final String path, final FirestackDBReference dbRef) {
mDBListeners.put(path, dbRef);
}
private void removeDBHandle(final String path) {
if (mDBListeners.containsKey(path)) {
FirestackDBReference r = mDBListeners.get(path);
r.cleanup();
mDBListeners.remove(path);
}
}
private String keyPath(final String path, final String eventName) {
return path + "-" + eventName;
}
// TODO: move to FirestackDBReference?
private DatabaseReference getDatabaseReferenceAtPath(final String path) {
DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference(path);
return mDatabase;
}
private Query getDatabaseQueryAtPathAndModifiers(
final String path,
final ReadableArray modifiers) {
DatabaseReference ref = this.getDatabaseReferenceAtPath(path);
List<Object> strModifiers = FirestackUtils.recursivelyDeconstructReadableArray(modifiers);
ListIterator<Object> it = strModifiers.listIterator();
Query query = ref.orderByKey();
while(it.hasNext()) {
String str = (String) it.next();
String[] strArr = str.split(":");
String methStr = strArr[0];
if (methStr.equalsIgnoreCase("orderByKey")) {
query = ref.orderByKey();
} else if (methStr.equalsIgnoreCase("orderByValue")) {
query = ref.orderByValue();
} else if (methStr.equalsIgnoreCase("orderByPriority")) {
query = ref.orderByPriority();
} else if (methStr.contains("orderByChild")) {
String key = strArr[1];
Log.d(TAG, "orderByChild: " + key);
query = ref.orderByChild(key);
} else if (methStr.contains("limitToLast")) {
String key = strArr[1];
int limit = Integer.parseInt(key);
Log.d(TAG, "limitToLast: " + limit);
query = query.limitToLast(limit);
} else if (methStr.contains("limitToFirst")) {
String key = strArr[1];
int limit = Integer.parseInt(key);
Log.d(TAG, "limitToFirst: " + limit);
query = query.limitToFirst(limit);
} else if (methStr.contains("equalTo")) {
String value = strArr[1];
String key = strArr.length >= 3 ? strArr[2] : null;
if (key == null) {
query = query.equalTo(value);
} else {
query = query.equalTo(value, key);
}
} else if (methStr.contains("endAt")) {
String value = strArr[1];
String key = strArr.length >= 3 ? strArr[2] : null;
if (key == null) {
query = query.endAt(value);
} else {
query = query.endAt(value, key);
}
} else if (methStr.contains("startAt")) {
String value = strArr[1];
String key = strArr.length >= 3 ? strArr[2] : null;
if (key == null) {
query = query.startAt(value);
} else {
query = query.startAt(value, key);
}
}
}
return query;
}
private WritableMap dataSnapshotToMap(String name, String path, DataSnapshot dataSnapshot) {
return FirestackUtils.dataSnapshotToMap(name, path, dataSnapshot);
}
private <Any> Any castSnapshotValue(DataSnapshot snapshot) {
if (snapshot.hasChildren()) {
WritableMap data = Arguments.createMap();
for (DataSnapshot child : snapshot.getChildren()) {
Any castedChild = castSnapshotValue(child);
switch (castedChild.getClass().getName()) {
case "java.lang.Boolean":
data.putBoolean(child.getKey(), (Boolean) castedChild);
break;
case "java.lang.Long":
data.putDouble(child.getKey(), (Long) castedChild);
break;
case "java.lang.Double":
data.putDouble(child.getKey(), (Double) castedChild);
break;
case "java.lang.String":
data.putString(child.getKey(), (String) castedChild);
break;
case "com.facebook.react.bridge.WritableNativeMap":
data.putMap(child.getKey(), (WritableMap) castedChild);
break;
}
}
return (Any) data;
} else {
if (snapshot.getValue() != null) {
String type = snapshot.getValue().getClass().getName();
switch (type) {
case "java.lang.Boolean":
return (Any)((Boolean) snapshot.getValue());
case "java.lang.Long":
return (Any) ((Long) snapshot.getValue());
case "java.lang.Double":
return (Any)((Double) snapshot.getValue());
case "java.lang.String":
return (Any)((String) snapshot.getValue());
default:
return (Any) null;
}
} else {
return (Any) null;
}
}
}
}