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/*
* Copyright 2017 Google
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import <Foundation/Foundation.h>
@class FIRDocumentReference;
@class FIRSnapshotMetadata;
NS_ASSUME_NONNULL_BEGIN
/**
* Controls the return value for server timestamps that have not yet been set to
* their final value.
*/
typedef NS_ENUM(NSInteger, FIRServerTimestampBehavior) {
/**
* Return a local estimates for `FieldValue.serverTimestamp()`
* fields that have not yet been set to their final value. This estimate will
* likely differ from the final value and may cause these pending values to
* change once the server result becomes available.
*/
FIRServerTimestampBehaviorEstimate,
/**
* Return the previous value for `FieldValue.serverTimestamp()` fields that
* have not yet been set to their final value.
*/
FIRServerTimestampBehaviorPrevious,
/**
* Return `NSNull` for `FieldValue.serverTimestamp()` fields that have not yet
* been set to their final value.
*/
FIRServerTimestampBehaviorNone
};
/**
* Options that configure how data is retrieved from a `DocumentSnapshot`
* (e.g. the desired behavior for server timestamps that have not yet been set
* to their final value).
*/
NS_SWIFT_NAME(SnapshotOptions)
@interface FIRSnapshotOptions : NSObject
/** */
- (instancetype)init __attribute__((unavailable("FIRSnapshotOptions cannot be created directly.")));
/**
* If set, controls the return value for `FieldValue.serverTimestamp()`
* fields that have not yet been set to their final value.
*
* If omitted, `NSNull` will be returned by default.
*
* @return The created `FIRSnapshotOptions` object.
*/
+ (instancetype)serverTimestampBehavior:(FIRServerTimestampBehavior)serverTimestampBehavior;
@end
/**
* A `FIRDocumentSnapshot` contains data read from a document in your Firestore database. The data
* can be extracted with the `data` property or by using subscript syntax to access a specific
* field.
*/
NS_SWIFT_NAME(DocumentSnapshot)
@interface FIRDocumentSnapshot : NSObject
/** */
- (instancetype)init
__attribute__((unavailable("FIRDocumentSnapshot cannot be created directly.")));
/** True if the document exists. */
@property(nonatomic, assign, readonly) BOOL exists;
/** A `FIRDocumentReference` to the document location. */
@property(nonatomic, strong, readonly) FIRDocumentReference *reference;
/** The ID of the document for which this `FIRDocumentSnapshot` contains data. */
@property(nonatomic, copy, readonly) NSString *documentID;
/** Metadata about this snapshot concerning its source and if it has local modifications. */
@property(nonatomic, strong, readonly) FIRSnapshotMetadata *metadata;
/**
* Retrieves all fields in the document as an `NSDictionary`.
*
* Server-provided timestamps that have not yet been set to their final value
* will be returned as `NSNull`. You can use `dataWithOptions()` to configure this
* behavior.
*
* @return An `NSDictionary` containing all fields in the document.
*/
- (NSDictionary<NSString *, id> *)data;
/**
* Retrieves all fields in the document as a `Dictionary`.
*
* @param options `SnapshotOptions` to configure how data is returned from the
* snapshot (e.g. the desired behavior for server timestamps that have not
* yet been set to their final value).
* @return A `Dictionary` containing all fields in the document.
*/
- (NSDictionary<NSString *, id> *)dataWithOptions:(FIRSnapshotOptions *)options;
/**
* Retrieves a specific field from the document.
*
* The timestamps that have not yet been set to their final value
* will be returned as `NSNull`. The can use `get(_:options:)` to
* configure this behavior.
*
* @param field The field to retrieve.
* @return The value contained in the field or `nil` if the field doesn't exist.
*/
- (nullable id)valueForField:(id)field NS_SWIFT_NAME(get(_:));
/**
* Retrieves a specific field from the document.
*
* The timestamps that have not yet been set to their final value
* will be returned as `NSNull`. The can use `get(_:options:)` to
* configure this behavior.
*
* @param field The field to retrieve.
* @param options `SnapshotOptions` to configure how data is returned from the
* snapshot (e.g. the desired behavior for server timestamps that have not
* yet been set to their final value).
* @return The value contained in the field or `nil` if the field doesn't exist.
*/
// clang-format off
- (nullable id)valueForField:(id)field
options:(FIRSnapshotOptions *)options
NS_SWIFT_NAME(get(_:options:));
// clang-format on
/**
* Retrieves a specific field from the document.
*
* @param key The field to retrieve.
*
* @return The value contained in the field or `nil` if the field doesn't exist.
*/
- (nullable id)objectForKeyedSubscript:(id)key;
@end
NS_ASSUME_NONNULL_END
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