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413 lines
21 KiB
413 lines
21 KiB
6 years ago
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/*
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* Firebase iOS Client Library
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*
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* Copyright © 2013 Firebase - All Rights Reserved
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* https://www.firebase.com
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binaryform must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY FIREBASE AS IS AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL FIREBASE BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#import <Foundation/Foundation.h>
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#import "FEventType.h"
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#import "FDataSnapshot.h"
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typedef NSUInteger FirebaseHandle;
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/**
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* An FQuery instance represents a query over the data at a particular location.
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*
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* You create one by calling one of the query methods (queryStartingAtPriority:, queryEndingAtPriority:, etc.)
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* on a Firebase reference. The query methods can be chained to further specify the data you are interested in
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* observing
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*/
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@interface FQuery : NSObject
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/** @name Attaching observers to read data */
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/**
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* observeEventType:withBlock: is used to listen for data changes at a particular location.
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* This is the primary way to read data from Firebase. Your block will be triggered
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* for the initial data and again whenever the data changes.
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*
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* Use removeObserverWithHandle: to stop receiving updates.
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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. It is passed the data as an FDataSnapshot.
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* @return A handle used to unregister this block later using removeObserverWithHandle:
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*/
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- (FirebaseHandle) observeEventType:(FEventType)eventType withBlock:(void (^)(FDataSnapshot* snapshot))block;
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/**
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* observeEventType:andPreviousSiblingKeyWithBlock: is used to listen for data changes at a particular location.
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* This is the primary way to read data from Firebase. Your block will be triggered
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* for the initial data and again whenever the data changes. In addition, for FEventTypeChildAdded, FEventTypeChildMoved, and
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* FEventTypeChildChanged events, your 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. It is passed the data as an FDataSnapshot
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* and the previous child's key.
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* @return A handle used to unregister this block later using removeObserverWithHandle:
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*/
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- (FirebaseHandle) observeEventType:(FEventType)eventType andPreviousSiblingKeyWithBlock:(void (^)(FDataSnapshot* snapshot, NSString* prevKey))block;
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/**
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* observeEventType:withBlock: is used to listen for data changes at a particular location.
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* This is the primary way to read data from Firebase. Your block will be triggered
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* for the initial data and again 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 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. It is passed the data as an FDataSnapshot.
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* @param cancelBlock The block that should be called if this client no longer has permission to receive these events
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* @return A handle used to unregister this block later using removeObserverWithHandle:
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*/
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- (FirebaseHandle) observeEventType:(FEventType)eventType withBlock:(void (^)(FDataSnapshot* snapshot))block withCancelBlock:(void (^)(NSError* error))cancelBlock;
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/**
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* observeEventType:andPreviousSiblingKeyWithBlock: is used to listen for data changes at a particular location.
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* This is the primary way to read data from Firebase. Your block will be triggered
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* for the initial data and again whenever the data changes. In addition, for FEventTypeChildAdded, FEventTypeChildMoved, and
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* FEventTypeChildChanged events, your 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 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. It is passed the data as an FDataSnapshot
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* and the previous child's key.
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* @param cancelBlock The block that should be called if this client no longer has permission to receive these events
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* @return A handle used to unregister this block later using removeObserverWithHandle:
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*/
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- (FirebaseHandle) observeEventType:(FEventType)eventType andPreviousSiblingKeyWithBlock:(void (^)(FDataSnapshot* snapshot, NSString* prevKey))block withCancelBlock:(void (^)(NSError* error))cancelBlock;
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/**
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* This is equivalent to observeEventType:withBlock:, except the block is 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 an FDataSnapshot.
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*/
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- (void) observeSingleEventOfType:(FEventType)eventType withBlock:(void (^)(FDataSnapshot* snapshot))block;
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/**
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* This is equivalent to observeEventType:withBlock:, except the block is immediately canceled after the initial data is returned. In addition, for FEventTypeChildAdded, FEventTypeChildMoved, and
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* FEventTypeChildChanged events, your block will be passed the key of the 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 an FDataSnapshot and the previous child's key.
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*/
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- (void) observeSingleEventOfType:(FEventType)eventType andPreviousSiblingKeyWithBlock:(void (^)(FDataSnapshot* snapshot, NSString* prevKey))block;
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/**
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* This is equivalent to observeEventType:withBlock:, except the block is 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 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 an FDataSnapshot.
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* @param cancelBlock The block that will be called if you don't have permission to access this data
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*/
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- (void) observeSingleEventOfType:(FEventType)eventType withBlock:(void (^)(FDataSnapshot* snapshot))block withCancelBlock:(void (^)(NSError* error))cancelBlock;
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/**
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* This is equivalent to observeEventType:withBlock:, except the block is immediately canceled after the initial data is returned. In addition, for FEventTypeChildAdded, FEventTypeChildMoved, and
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* FEventTypeChildChanged events, your 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 do not have permission to read data at 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 an FDataSnapshot and the previous child's key.
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* @param cancelBlock The block that will be called if you don't have permission to access this data
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*/
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- (void) observeSingleEventOfType:(FEventType)eventType andPreviousSiblingKeyWithBlock:(void (^)(FDataSnapshot* snapshot, NSString* prevKey))block withCancelBlock:(void (^)(NSError* error))cancelBlock;
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/** @name 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: which we are trying to remove.
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*/
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- (void) removeObserverWithHandle:(FirebaseHandle)handle;
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/**
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* Detach all blocks previously attached to this Firebase location with 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 automatically be downloaded and
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* kept in sync, even when no listeners are attached for that location. Additionally, while a location is kept
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* synced, it 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 stop synchronization.
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*/
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- (void) keepSynced:(BOOL)keepSynced;
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/** @name Querying and limiting */
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/**
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* This method is deprecated in favor of using queryStartingAtValue:. This can be used with queryOrderedByPriority
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* to query by priority.
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*
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* queryStartingAtPriority: is used to generate a reference to a limited view of the data at this location.
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* The FQuery instance returned by queryStartingAtPriority: will respond to events at nodes with a priority
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* greater than or equal to startPriority
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*
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* @param startPriority The lower bound, inclusive, for the priority of data visible to the returned FQuery
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* @return An FQuery instance, limited to data with priority greater than or equal to startPriority
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*/
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- (FQuery *) queryStartingAtPriority:(id)startPriority __attribute__((deprecated("Use [[FQuery queryOrderedByPriority] queryStartingAtValue:] instead")));
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/**
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* This method is deprecated in favor of using queryStartingAtValue:childKey:. This can be used with queryOrderedByPriority
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* to query by priority.
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*
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* queryStartingAtPriority:andChildName: is used to generate a reference to a limited view of the data at this location.
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* The FQuery instance returned by queryStartingAtPriority:andChildName will respond to events at nodes with a priority
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* greater than startPriority, or equal to startPriority and with a name greater than or equal to childName
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*
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* @param startPriority The lower bound, inclusive, for the priority of data visible to the returned FQuery
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* @param childName The lower bound, inclusive, for the name of nodes with priority equal to startPriority
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* @return An FQuery instance, limited to data with priority greater than or equal to startPriority
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*/
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- (FQuery *) queryStartingAtPriority:(id)startPriority andChildName:(NSString *)childName __attribute__((deprecated("Use [[FQuery queryOrderedByPriority] queryStartingAtValue:childKey:] instead")));
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/**
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* This method is deprecated in favor of using queryEndingAtValue:. This can be used with queryOrderedByPriority
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* to query by priority.
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*
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* queryEndingAtPriority: is used to generate a reference to a limited view of the data at this location.
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* The FQuery instance returned by queryEndingAtPriority: will respond to events at nodes with a priority
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* less than or equal to startPriority and with a name greater than or equal to childName
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*
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* @param endPriority The upper bound, inclusive, for the priority of data visible to the returned FQuery
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* @return An FQuery instance, limited to data with priority less than or equal to endPriority
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*/
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- (FQuery *) queryEndingAtPriority:(id)endPriority __attribute__((deprecated("Use [[FQuery queryOrderedByPriority] queryEndingAtValue:] instead")));
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/**
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* This method is deprecated in favor of using queryEndingAtValue:childKey:. This can be used with queryOrderedByPriority
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* to query by priority.
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*
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* queryEndingAtPriority:andChildName: is used to generate a reference to a limited view of the data at this location.
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* The FQuery instance returned by queryEndingAtPriority:andChildName will respond to events at nodes with a priority
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* less than endPriority, or equal to endPriority and with a name less than or equal to childName
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*
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* @param endPriority The upper bound, inclusive, for the priority of data visible to the returned FQuery
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* @param childName The upper bound, inclusive, for the name of nodes with priority equal to endPriority
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* @return An FQuery instance, limited to data with priority less than endPriority or equal to endPriority and with a name less than or equal to childName
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*/
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- (FQuery *) queryEndingAtPriority:(id)endPriority andChildName:(NSString *)childName __attribute__((deprecated("Use [[FQuery queryOrderedByPriority] queryEndingAtValue:childKey:] instead")));
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/**
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* This method is deprecated in favor of using queryEqualToValue:. This can be used with queryOrderedByPriority
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* to query by priority.
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*
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* queryEqualToPriority: is used to generate a reference to a limited view of the data at this location.
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* The FQuery instance returned by queryEqualToPriority: will respond to events at nodes with a priority equal to
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* supplied argument.
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*
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* @param priority The priority that the data returned by this FQuery will have
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* @return An Fquery instance, limited to data with the supplied priority.
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*/
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- (FQuery *) queryEqualToPriority:(id)priority __attribute__((deprecated("Use [[FQuery queryOrderedByPriority] queryEqualToValue:] instead")));
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/**
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* This method is deprecated in favor of using queryEqualAtValue:childKey:. This can be used with queryOrderedByPriority
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* to query by priority.
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*
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* queryEqualToPriority:andChildName: is used to generate a reference to a limited view of the data at this location.
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* The FQuery instance returned by queryEqualToPriority:andChildName will respond to events at nodes with a priority
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* equal to the supplied argument with a name equal to childName. There will be at most one node that matches because
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* child names are unique.
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*
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* @param priority The priority that the data returned by this FQuery will have
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* @param childName The name of nodes with the right priority
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* @return An FQuery instance, limited to data with the supplied priority and the name.
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*/
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- (FQuery *) queryEqualToPriority:(id)priority andChildName:(NSString *)childName __attribute__((deprecated("Use [[FQuery queryOrderedByPriority] queryEqualToValue:childKey:] instead")));
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/**
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* This method is deprecated in favor of using queryLimitedToFirst:limit or queryLimitedToLast:limit instead.
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*
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* queryLimitedToNumberOfChildren: is used to generate a reference to a limited view of the data at this location.
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* The FQuery instance returned by queryLimitedToNumberOfChildren: will respond to events from at most limit child nodes.
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*
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* @param limit The upper bound, inclusive, for the number of child nodes to receive events for
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* @return An FQuery instance, limited to at most limit child nodes.
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*/
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- (FQuery *) queryLimitedToNumberOfChildren:(NSUInteger)limit __attribute__((deprecated("Use [FQuery queryLimitedToFirst:limit] or [FQuery queryLimitedToLast:limit] instead")));
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/**
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* queryLimitedToFirst: is used to generate a reference to a limited view of the data at this location.
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* The FQuery instance returned by 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 receive events for
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* @return An FQuery instance, limited to at most limit child nodes.
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*/
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- (FQuery *) queryLimitedToFirst:(NSUInteger)limit;
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/**
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* queryLimitedToLast: is used to generate a reference to a limited view of the data at this location.
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* The FQuery instance returned by 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 receive events for
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* @return An FQuery instance, limited to at most limit child nodes.
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*/
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- (FQuery *) 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 been sorted by the values of
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* a particular child key. This method is intended to be used in combination with queryStartingAtValue:,
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* queryEndingAtValue:, or queryEqualToValue:.
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*
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* @param key The child key to use in ordering data visible to the returned FQuery
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* @return An FQuery instance, ordered by the values of the specified child key.
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*/
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- (FQuery *) queryOrderedByChild:(NSString *)key;
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/**
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* queryOrderedByKey: is used to generate a reference to a view of the data that's been sorted by child key.
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* This method is intended to be used in combination with queryStartingAtValue:, queryEndingAtValue:,
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* or queryEqualToValue:.
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*
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* @return An FQuery instance, ordered by child keys.
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*/
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@property (NS_NONATOMIC_IOSONLY, readonly, strong) FQuery *queryOrderedByKey;
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/**
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* queryOrderedByValue: is used to generate a reference to a view of the data that's been sorted by child value.
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* This method is intended to be used in combination with queryStartingAtValue:, queryEndingAtValue:,
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* or queryEqualToValue:.
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*
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* @return An FQuery instance, ordered by child value.
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*/
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@property (NS_NONATOMIC_IOSONLY, readonly, strong) FQuery *queryOrderedByValue;
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/**
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* queryOrderedByPriority: is used to generate a reference to a view of the data that's been sorted by child
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* priority. This method is intended to be used in combination with queryStartingAtValue:, queryEndingAtValue:,
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* or queryEqualToValue:.
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*
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* @return An FQuery instance, ordered by child priorities.
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*/
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@property (NS_NONATOMIC_IOSONLY, readonly, strong) FQuery *queryOrderedByPriority;
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/**
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* queryStartingAtValue: is used to generate a reference to a limited view of the data at this location.
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* The FQuery instance returned by queryStartingAtValue: will respond to events at nodes with a value
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* greater 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 to the returned FQuery
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* @return An FQuery instance, limited to data with value greater than or equal to startValue
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*/
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- (FQuery *) queryStartingAtValue:(id)startValue;
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/**
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* queryStartingAtValue:childKey: is used to generate a reference to a limited view of the data at this location.
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* The FQuery instance returned by 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 or equal to childKey.
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*
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* @param startValue The lower bound, inclusive, for the value of data visible to the returned FQuery
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* @param childKey The lower bound, inclusive, for the key of nodes with value equal to startValue
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* @return An FQuery instance, limited to data with value greater than or equal to startValue
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*/
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|
- (FQuery *) queryStartingAtValue:(id)startValue childKey:(NSString *)childKey;
|
||
|
|
||
|
/**
|
||
|
* queryEndingAtValue: is used to generate a reference to a limited view of the data at this location.
|
||
|
* The FQuery 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 FQuery
|
||
|
* @return An FQuery instance, limited to data with value less than or equal to endValue
|
||
|
*/
|
||
|
- (FQuery *) queryEndingAtValue:(id)endValue;
|
||
|
|
||
|
/**
|
||
|
* queryEndingAtValue:childKey: is used to generate a reference to a limited view of the data at this location.
|
||
|
* The FQuery 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.
|
||
|
*
|
||
|
* @param endValue The upper bound, inclusive, for the value of data visible to the returned FQuery
|
||
|
* @param childKey The upper bound, inclusive, for the key of nodes with value equal to endValue
|
||
|
* @return An FQuery instance, limited to data with value less than or equal to endValue
|
||
|
*/
|
||
|
- (FQuery *) queryEndingAtValue:(id)endValue childKey:(NSString *)childKey;
|
||
|
|
||
|
/**
|
||
|
* queryEqualToValue: is used to generate a reference to a limited view of the data at this location.
|
||
|
* The FQuery 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 FQuery will have
|
||
|
* @return An Fquery instance, limited to data with the supplied value.
|
||
|
*/
|
||
|
- (FQuery *) queryEqualToValue:(id)value;
|
||
|
|
||
|
/**
|
||
|
* queryEqualToValue:childKey: is used to generate a reference to a limited view of the data at this location.
|
||
|
* The FQuery instance returned by queryEqualToValue:childKey will respond to events at nodes with a value
|
||
|
* equal to the supplied argument with a name 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 FQuery will have
|
||
|
* @param childKey The name of nodes with the right value
|
||
|
* @return An FQuery instance, limited to data with the supplied value and the key.
|
||
|
*/
|
||
|
- (FQuery *) queryEqualToValue:(id)value childKey:(NSString *)childKey;
|
||
|
|
||
|
|
||
|
/** @name Properties */
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Get a Firebase reference for the location of this query.
|
||
|
*
|
||
|
* @return A Firebase instance for the location of this query.
|
||
|
*/
|
||
|
@property (nonatomic, readonly, strong) Firebase* ref;
|
||
|
|
||
|
@end
|