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468 lines
20 KiB
468 lines
20 KiB
4 years ago
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/*
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* Copyright 2017 Google
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import "FIRDataEventType.h"
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#import "FIRDataSnapshot.h"
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#import <Foundation/Foundation.h>
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NS_ASSUME_NONNULL_BEGIN
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/**
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* A FIRDatabaseHandle is used to identify listeners of Firebase Database
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* events. These handles are returned by observeEventType: and can later be
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* passed to removeObserverWithHandle: to stop receiving updates.
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*/
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typedef NSUInteger FIRDatabaseHandle NS_SWIFT_NAME(DatabaseHandle);
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/**
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* A FIRDatabaseQuery instance represents a query over the data at a particular
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* location.
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*
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* You create one by calling one of the query methods (queryOrderedByChild:,
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* queryStartingAtValue:, etc.) on a FIRDatabaseReference. The query methods can
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* be chained to further specify the data you are interested in observing
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*/
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NS_SWIFT_NAME(DatabaseQuery)
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@interface FIRDatabaseQuery : NSObject
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#pragma mark - Attach observers to read data
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/**
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* observeEventType:withBlock: is used to listen for data changes at a
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* particular location. This is the primary way to read data from the Firebase
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* Database. Your block will be triggered for the initial data and again
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* whenever the data changes.
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*
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* Use removeObserverWithHandle: to stop receiving updates.
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*
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* @param eventType The type of event to listen for.
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* @param block The block that should be called with initial data and updates.
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* It is passed the data as a FIRDataSnapshot.
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* @return A handle used to unregister this block later using
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* removeObserverWithHandle:
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*/
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- (FIRDatabaseHandle)observeEventType:(FIRDataEventType)eventType
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withBlock:
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(void (^)(FIRDataSnapshot *snapshot))block;
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/**
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* observeEventType:andPreviousSiblingKeyWithBlock: is used to listen for data
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* changes at a particular location. This is the primary way to read data from
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* the Firebase Database. Your block will be triggered for the initial data and
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* again whenever the data changes. In addition, for FIRDataEventTypeChildAdded,
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* FIRDataEventTypeChildMoved, and FIRDataEventTypeChildChanged events, your
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* block will be passed the key of the previous node by priority order.
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*
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* Use removeObserverWithHandle: to stop receiving updates.
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*
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* @param eventType The type of event to listen for.
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* @param block The block that should be called with initial data and updates.
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* It is passed the data as a FIRDataSnapshot and the previous child's key.
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* @return A handle used to unregister this block later using
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* removeObserverWithHandle:
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*/
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- (FIRDatabaseHandle)observeEventType:(FIRDataEventType)eventType
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andPreviousSiblingKeyWithBlock:
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(void (^)(FIRDataSnapshot *snapshot,
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NSString *__nullable prevKey))block;
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/**
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* observeEventType:withBlock: is used to listen for data changes at a
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* particular location. This is the primary way to read data from the Firebase
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* Database. Your block will be triggered for the initial data and again
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* whenever the data changes.
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*
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* The cancelBlock will be called if you will no longer receive new events due
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* to no longer having permission.
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*
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* Use removeObserverWithHandle: to stop receiving updates.
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*
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* @param eventType The type of event to listen for.
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* @param block The block that should be called with initial data and updates.
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* It is passed the data as a FIRDataSnapshot.
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* @param cancelBlock The block that should be called if this client no longer
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* has permission to receive these events
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* @return A handle used to unregister this block later using
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* removeObserverWithHandle:
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*/
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- (FIRDatabaseHandle)observeEventType:(FIRDataEventType)eventType
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withBlock:(void (^)(FIRDataSnapshot *snapshot))block
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withCancelBlock:
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(nullable void (^)(NSError *error))cancelBlock;
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/**
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* observeEventType:andPreviousSiblingKeyWithBlock: is used to listen for data
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* changes at a particular location. This is the primary way to read data from
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* the Firebase Database. Your block will be triggered for the initial data and
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* again whenever the data changes. In addition, for FIRDataEventTypeChildAdded,
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* FIRDataEventTypeChildMoved, and FIRDataEventTypeChildChanged events, your
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* block will be passed the key of the previous node by priority order.
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*
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* The cancelBlock will be called if you will no longer receive new events due
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* to no longer having permission.
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*
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* Use removeObserverWithHandle: to stop receiving updates.
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*
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* @param eventType The type of event to listen for.
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* @param block The block that should be called with initial data and updates.
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* It is passed the data as a FIRDataSnapshot and the previous child's key.
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* @param cancelBlock The block that should be called if this client no longer
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* has permission to receive these events
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* @return A handle used to unregister this block later using
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* removeObserverWithHandle:
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*/
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- (FIRDatabaseHandle)observeEventType:(FIRDataEventType)eventType
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andPreviousSiblingKeyWithBlock:
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(void (^)(FIRDataSnapshot *snapshot,
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NSString *__nullable prevKey))block
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withCancelBlock:
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(nullable void (^)(NSError *error))cancelBlock;
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/**
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* getDataWithCompletionBlock: is used to get the most up-to-date value for
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* this query. This method updates the cache and raises events if successful. If
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* not connected, falls back to a locally-cached value.
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*
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* @param block The block that should be called with the most up-to-date value
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* of this query, or an error if no such value could be retrieved.
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*/
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- (void)getDataWithCompletionBlock:
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(void (^_Nonnull)(NSError *__nullable error,
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FIRDataSnapshot *snapshot))block
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NS_SWIFT_NAME(getData(completion:));
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/**
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* This is equivalent to observeEventType:withBlock:, except the block is
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* immediately canceled after the initial data is returned.
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*
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* @param eventType The type of event to listen for.
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* @param block The block that should be called. It is passed the data as a
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* FIRDataSnapshot.
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*/
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- (void)observeSingleEventOfType:(FIRDataEventType)eventType
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withBlock:(void (^)(FIRDataSnapshot *snapshot))block;
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/**
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* This is equivalent to observeEventType:withBlock:, except the block is
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* immediately canceled after the initial data is returned. In addition, for
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* FIRDataEventTypeChildAdded, FIRDataEventTypeChildMoved, and
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* FIRDataEventTypeChildChanged events, your block will be passed the key of the
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* previous node by priority order.
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*
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* @param eventType The type of event to listen for.
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* @param block The block that should be called. It is passed the data as a
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* FIRDataSnapshot and the previous child's key.
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*/
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- (void)observeSingleEventOfType:(FIRDataEventType)eventType
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andPreviousSiblingKeyWithBlock:
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(void (^)(FIRDataSnapshot *snapshot,
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NSString *__nullable prevKey))block;
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/**
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* This is equivalent to observeEventType:withBlock:, except the block is
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* immediately canceled after the initial data is returned.
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*
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* The cancelBlock will be called if you do not have permission to read data at
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* this location.
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*
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* @param eventType The type of event to listen for.
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* @param block The block that should be called. It is passed the data as a
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* FIRDataSnapshot.
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* @param cancelBlock The block that will be called if you don't have permission
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* to access this data
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*/
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- (void)observeSingleEventOfType:(FIRDataEventType)eventType
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withBlock:(void (^)(FIRDataSnapshot *snapshot))block
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withCancelBlock:(nullable void (^)(NSError *error))cancelBlock;
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/**
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* This is equivalent to observeEventType:withBlock:, except the block is
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* immediately canceled after the initial data is returned. In addition, for
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* FIRDataEventTypeChildAdded, FIRDataEventTypeChildMoved, and
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* FIRDataEventTypeChildChanged events, your block will be passed the key of the
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* previous node by priority order.
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*
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* The cancelBlock will be called if you do not have permission to read data at
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* this location.
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*
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* @param eventType The type of event to listen for.
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* @param block The block that should be called. It is passed the data as a
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* FIRDataSnapshot and the previous child's key.
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* @param cancelBlock The block that will be called if you don't have permission
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* to access this data
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*/
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- (void)observeSingleEventOfType:(FIRDataEventType)eventType
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andPreviousSiblingKeyWithBlock:(void (^)(FIRDataSnapshot *snapshot,
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NSString *__nullable prevKey))block
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withCancelBlock:
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(nullable void (^)(NSError *error))cancelBlock;
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#pragma mark - Detaching observers
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/**
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* Detach a block previously attached with observeEventType:withBlock:.
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*
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* @param handle The handle returned by the call to observeEventType:withBlock:
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* which we are trying to remove.
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*/
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- (void)removeObserverWithHandle:(FIRDatabaseHandle)handle;
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/**
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* Detach all blocks previously attached to this Firebase Database location with
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* observeEventType:withBlock:
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*/
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- (void)removeAllObservers;
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/**
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* By calling `keepSynced:YES` on a location, the data for that location will
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* automatically be downloaded and kept in sync, even when no listeners are
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* attached for that location. Additionally, while a location is kept synced, it
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* will not be evicted from the persistent disk cache.
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*
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* @param keepSynced Pass YES to keep this location synchronized, pass NO to
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* stop synchronization.
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*/
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- (void)keepSynced:(BOOL)keepSynced;
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#pragma mark - Querying and limiting
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/**
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* queryLimitedToFirst: is used to generate a reference to a limited view of the
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* data at this location. The FIRDatabaseQuery instance returned by
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* queryLimitedToFirst: will respond to at most the first limit child nodes.
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*
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* @param limit The upper bound, inclusive, for the number of child nodes to
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* receive events for
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* @return A FIRDatabaseQuery instance, limited to at most limit child nodes.
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*/
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- (FIRDatabaseQuery *)queryLimitedToFirst:(NSUInteger)limit;
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/**
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* queryLimitedToLast: is used to generate a reference to a limited view of the
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* data at this location. The FIRDatabaseQuery instance returned by
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* queryLimitedToLast: will respond to at most the last limit child nodes.
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*
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* @param limit The upper bound, inclusive, for the number of child nodes to
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* receive events for
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* @return A FIRDatabaseQuery instance, limited to at most limit child nodes.
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*/
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- (FIRDatabaseQuery *)queryLimitedToLast:(NSUInteger)limit;
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/**
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* queryOrderBy: is used to generate a reference to a view of the data that's
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* been sorted by the values of a particular child key. This method is intended
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* to be used in combination with queryStartingAtValue:, queryEndingAtValue:, or
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* queryEqualToValue:.
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*
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* @param key The child key to use in ordering data visible to the returned
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* FIRDatabaseQuery
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* @return A FIRDatabaseQuery instance, ordered by the values of the specified
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* child key.
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*/
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- (FIRDatabaseQuery *)queryOrderedByChild:(NSString *)key;
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/**
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* queryOrderedByKey: is used to generate a reference to a view of the data
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* that's been sorted by child key. This method is intended to be used in
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* combination with queryStartingAtValue:, queryEndingAtValue:, or
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* queryEqualToValue:.
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*
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* @return A FIRDatabaseQuery instance, ordered by child keys.
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*/
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- (FIRDatabaseQuery *)queryOrderedByKey;
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/**
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* queryOrderedByValue: is used to generate a reference to a view of the data
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* that's been sorted by child value. This method is intended to be used in
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* combination with queryStartingAtValue:, queryEndingAtValue:, or
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* queryEqualToValue:.
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*
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* @return A FIRDatabaseQuery instance, ordered by child value.
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*/
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- (FIRDatabaseQuery *)queryOrderedByValue;
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/**
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* queryOrderedByPriority: is used to generate a reference to a view of the data
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* that's been sorted by child priority. This method is intended to be used in
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* combination with queryStartingAtValue:, queryEndingAtValue:, or
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* queryEqualToValue:.
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*
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* @return A FIRDatabaseQuery instance, ordered by child priorities.
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*/
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- (FIRDatabaseQuery *)queryOrderedByPriority;
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/**
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* queryStartingAtValue: is used to generate a reference to a limited view of
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* the data at this location. The FIRDatabaseQuery instance returned by
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* queryStartingAtValue: will respond to events at nodes with a value greater
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* than or equal to startValue.
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*
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* @param startValue The lower bound, inclusive, for the value of data visible
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* to the returned FIRDatabaseQuery
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* @return A FIRDatabaseQuery instance, limited to data with value greater than
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* or equal to startValue
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*/
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- (FIRDatabaseQuery *)queryStartingAtValue:(nullable id)startValue;
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/**
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* queryStartingAtValue:childKey: is used to generate a reference to a limited
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* view of the data at this location. The FIRDatabaseQuery instance returned by
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* queryStartingAtValue:childKey will respond to events at nodes with a value
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* greater than startValue, or equal to startValue and with a key greater than
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* or equal to childKey. This is most useful when implementing pagination in a
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* case where multiple nodes can match the startValue.
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*
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* @param startValue The lower bound, inclusive, for the value of data visible
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* to the returned FIRDatabaseQuery
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* @param childKey The lower bound, inclusive, for the key of nodes with value
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* equal to startValue
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* @return A FIRDatabaseQuery instance, limited to data with value greater than
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* or equal to startValue
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*/
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- (FIRDatabaseQuery *)queryStartingAtValue:(nullable id)startValue
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childKey:(nullable NSString *)childKey;
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/**
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* queryStartingAfterValue: is used to generate a reference to a
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* limited view of the data at this location. The FIRDatabaseQuery instance
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* returned by queryStartingAfterValue: will respond to events at nodes
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* with a value greater than startAfterValue.
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*
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* @param startAfterValue The lower bound, exclusive, for the value of data
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* visible to the returned FIRDatabaseQuery
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* @return A FIRDatabaseQuery instance, limited to data with value greater
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* startAfterValue
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*/
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- (FIRDatabaseQuery *)queryStartingAfterValue:(nullable id)startAfterValue;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* queryStartingAfterValue:childKey: is used to generate a reference to a
|
||
|
|
* limited view of the data at this location. The FIRDatabaseQuery instance
|
||
|
|
* returned by queryStartingAfterValue:childKey will respond to events at nodes
|
||
|
|
* with a value greater than startAfterValue, or equal to startAfterValue and
|
||
|
|
* with a key greater than childKey. This is most useful when implementing
|
||
|
|
* pagination in a case where multiple nodes can match the startAfterValue.
|
||
|
|
*
|
||
|
|
* @param startAfterValue The lower bound, inclusive, for the value of data
|
||
|
|
* visible to the returned FIRDatabaseQuery
|
||
|
|
* @param childKey The lower bound, exclusive, for the key of nodes with value
|
||
|
|
* equal to startAfterValue
|
||
|
|
* @return A FIRDatabaseQuery instance, limited to data with value greater than
|
||
|
|
* startAfterValue, or equal to startAfterValue with a key greater than childKey
|
||
|
|
*/
|
||
|
|
- (FIRDatabaseQuery *)queryStartingAfterValue:(nullable id)startAfterValue
|
||
|
|
childKey:(nullable NSString *)childKey;
|
||
|
|
/**
|
||
|
|
* queryEndingAtValue: is used to generate a reference to a limited view of the
|
||
|
|
* data at this location. The FIRDatabaseQuery instance returned by
|
||
|
|
* queryEndingAtValue: will respond to events at nodes with a value less than or
|
||
|
|
* equal to endValue.
|
||
|
|
*
|
||
|
|
* @param endValue The upper bound, inclusive, for the value of data visible to
|
||
|
|
* the returned FIRDatabaseQuery
|
||
|
|
* @return A FIRDatabaseQuery instance, limited to data with value less than or
|
||
|
|
* equal to endValue
|
||
|
|
*/
|
||
|
|
- (FIRDatabaseQuery *)queryEndingAtValue:(nullable id)endValue;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* queryEndingAtValue:childKey: is used to generate a reference to a limited
|
||
|
|
* view of the data at this location. The FIRDatabaseQuery instance returned by
|
||
|
|
* queryEndingAtValue:childKey will respond to events at nodes with a value less
|
||
|
|
* than endValue, or equal to endValue and with a key less than or equal to
|
||
|
|
* childKey. This is most useful when implementing pagination in a case where
|
||
|
|
* multiple nodes can match the endValue.
|
||
|
|
*
|
||
|
|
* @param endValue The upper bound, inclusive, for the value of data visible to
|
||
|
|
* the returned FIRDatabaseQuery
|
||
|
|
* @param childKey The upper bound, inclusive, for the key of nodes with value
|
||
|
|
* equal to endValue
|
||
|
|
* @return A FIRDatabaseQuery instance, limited to data with value less than or
|
||
|
|
* equal to endValue
|
||
|
|
*/
|
||
|
|
- (FIRDatabaseQuery *)queryEndingAtValue:(nullable id)endValue
|
||
|
|
childKey:(nullable NSString *)childKey;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* queryEndingBeforeValue: is used to generate a reference to a limited view of
|
||
|
|
* the data at this location. The FIRDatabaseQuery instance returned by
|
||
|
|
* queryEndingBeforeValue: will respond to events at nodes with a value less
|
||
|
|
* than endValue.
|
||
|
|
*
|
||
|
|
* @param endValue The upper bound, exclusive, for the value of data visible to
|
||
|
|
* the returned FIRDatabaseQuery
|
||
|
|
* @return A FIRDatabaseQuery instance, limited to data with value less than
|
||
|
|
* endValue
|
||
|
|
*/
|
||
|
|
- (FIRDatabaseQuery *)queryEndingBeforeValue:(nullable id)endValue;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* queryEndingBeforeValue:childKey: is used to generate a reference to a limited
|
||
|
|
* view of the data at this location. The FIRDatabaseQuery instance returned by
|
||
|
|
* queryEndingBeforeValue:childKey will respond to events at nodes with a value
|
||
|
|
* less than endValue, or equal to endValue and with a key less than childKey.
|
||
|
|
*
|
||
|
|
* @param endValue The upper bound, inclusive, for the value of data visible to
|
||
|
|
* the returned FIRDatabaseQuery
|
||
|
|
* @param childKey The upper bound, exclusive, for the key of nodes with value
|
||
|
|
* equal to endValue
|
||
|
|
* @return A FIRDatabaseQuery instance, limited to data with value less than or
|
||
|
|
* equal to endValue
|
||
|
|
*/
|
||
|
|
- (FIRDatabaseQuery *)queryEndingBeforeValue:(nullable id)endValue
|
||
|
|
childKey:(nullable NSString *)childKey;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* queryEqualToValue: is used to generate a reference to a limited view of the
|
||
|
|
* data at this location. The FIRDatabaseQuery instance returned by
|
||
|
|
* queryEqualToValue: will respond to events at nodes with a value equal to the
|
||
|
|
* supplied argument.
|
||
|
|
*
|
||
|
|
* @param value The value that the data returned by this FIRDatabaseQuery will
|
||
|
|
* have
|
||
|
|
* @return A FIRDatabaseQuery instance, limited to data with the supplied value.
|
||
|
|
*/
|
||
|
|
- (FIRDatabaseQuery *)queryEqualToValue:(nullable id)value;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* queryEqualToValue:childKey: is used to generate a reference to a limited view
|
||
|
|
* of the data at this location. The FIRDatabaseQuery instance returned by
|
||
|
|
* queryEqualToValue:childKey will respond to events at nodes with a value equal
|
||
|
|
* to the supplied argument and with their key equal to childKey. There will be
|
||
|
|
* at most one node that matches because child keys are unique.
|
||
|
|
*
|
||
|
|
* @param value The value that the data returned by this FIRDatabaseQuery will
|
||
|
|
* have
|
||
|
|
* @param childKey The name of nodes with the right value
|
||
|
|
* @return A FIRDatabaseQuery instance, limited to data with the supplied value
|
||
|
|
* and the key.
|
||
|
|
*/
|
||
|
|
- (FIRDatabaseQuery *)queryEqualToValue:(nullable id)value
|
||
|
|
childKey:(nullable NSString *)childKey;
|
||
|
|
|
||
|
|
#pragma mark - Properties
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Gets a FIRDatabaseReference for the location of this query.
|
||
|
|
*
|
||
|
|
* @return A FIRDatabaseReference for the location of this query.
|
||
|
|
*/
|
||
|
|
@property(nonatomic, readonly, strong) FIRDatabaseReference *ref;
|
||
|
|
|
||
|
|
@end
|
||
|
|
|
||
|
|
NS_ASSUME_NONNULL_END
|