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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 "Firestore/Source/Core/FSTViewSnapshot.h"
#import "Firestore/Source/Core/FSTQuery.h"
#import "Firestore/Source/Model/FSTDocument.h"
#import "Firestore/Source/Model/FSTDocumentSet.h"
#import "Firestore/Source/Util/FSTAssert.h"
#import "Firestore/third_party/Immutable/FSTImmutableSortedDictionary.h"
#include "Firestore/core/src/firebase/firestore/model/document_key.h"
using firebase::firestore::model::DocumentKey;
NS_ASSUME_NONNULL_BEGIN
#pragma mark - FSTDocumentViewChange
@interface FSTDocumentViewChange ()
+ (instancetype)changeWithDocument:(FSTDocument *)document type:(FSTDocumentViewChangeType)type;
- (instancetype)initWithDocument:(FSTDocument *)document
type:(FSTDocumentViewChangeType)type NS_DESIGNATED_INITIALIZER;
@end
@implementation FSTDocumentViewChange
+ (instancetype)changeWithDocument:(FSTDocument *)document type:(FSTDocumentViewChangeType)type {
return [[FSTDocumentViewChange alloc] initWithDocument:document type:type];
}
- (instancetype)initWithDocument:(FSTDocument *)document type:(FSTDocumentViewChangeType)type {
self = [super init];
if (self) {
_document = document;
_type = type;
}
return self;
}
- (BOOL)isEqual:(id)other {
if (self == other) {
return YES;
}
if (![other isKindOfClass:[FSTDocumentViewChange class]]) {
return NO;
}
FSTDocumentViewChange *otherChange = (FSTDocumentViewChange *)other;
return [self.document isEqual:otherChange.document] && self.type == otherChange.type;
}
- (NSString *)description {
return [NSString
stringWithFormat:@"<FSTDocumentViewChange type:%ld doc:%@>", (long)self.type, self.document];
}
@end
#pragma mark - FSTDocumentViewChangeSet
@interface FSTDocumentViewChangeSet ()
/** The set of all changes tracked so far, with redundant changes merged. */
@property(nonatomic, strong)
FSTImmutableSortedDictionary<FSTDocumentKey *, FSTDocumentViewChange *> *changeMap;
@end
@implementation FSTDocumentViewChangeSet
+ (instancetype)changeSet {
return [[FSTDocumentViewChangeSet alloc] init];
}
- (instancetype)init {
self = [super init];
if (self) {
_changeMap = [FSTImmutableSortedDictionary dictionaryWithComparator:FSTDocumentKeyComparator];
}
return self;
}
- (NSString *)description {
return [self.changeMap description];
}
- (void)addChange:(FSTDocumentViewChange *)change {
const DocumentKey &key = change.document.key;
FSTDocumentViewChange *oldChange = [self.changeMap objectForKey:key];
if (!oldChange) {
self.changeMap = [self.changeMap dictionaryBySettingObject:change forKey:key];
return;
}
// Merge the new change with the existing change.
if (change.type != FSTDocumentViewChangeTypeAdded &&
oldChange.type == FSTDocumentViewChangeTypeMetadata) {
self.changeMap = [self.changeMap dictionaryBySettingObject:change forKey:key];
} else if (change.type == FSTDocumentViewChangeTypeMetadata &&
oldChange.type != FSTDocumentViewChangeTypeRemoved) {
FSTDocumentViewChange *newChange =
[FSTDocumentViewChange changeWithDocument:change.document type:oldChange.type];
self.changeMap = [self.changeMap dictionaryBySettingObject:newChange forKey:key];
} else if (change.type == FSTDocumentViewChangeTypeModified &&
oldChange.type == FSTDocumentViewChangeTypeModified) {
FSTDocumentViewChange *newChange =
[FSTDocumentViewChange changeWithDocument:change.document
type:FSTDocumentViewChangeTypeModified];
self.changeMap = [self.changeMap dictionaryBySettingObject:newChange forKey:key];
} else if (change.type == FSTDocumentViewChangeTypeModified &&
oldChange.type == FSTDocumentViewChangeTypeAdded) {
FSTDocumentViewChange *newChange =
[FSTDocumentViewChange changeWithDocument:change.document
type:FSTDocumentViewChangeTypeAdded];
self.changeMap = [self.changeMap dictionaryBySettingObject:newChange forKey:key];
} else if (change.type == FSTDocumentViewChangeTypeRemoved &&
oldChange.type == FSTDocumentViewChangeTypeAdded) {
self.changeMap = [self.changeMap dictionaryByRemovingObjectForKey:key];
} else if (change.type == FSTDocumentViewChangeTypeRemoved &&
oldChange.type == FSTDocumentViewChangeTypeModified) {
FSTDocumentViewChange *newChange =
[FSTDocumentViewChange changeWithDocument:oldChange.document
type:FSTDocumentViewChangeTypeRemoved];
self.changeMap = [self.changeMap dictionaryBySettingObject:newChange forKey:key];
} else if (change.type == FSTDocumentViewChangeTypeAdded &&
oldChange.type == FSTDocumentViewChangeTypeRemoved) {
FSTDocumentViewChange *newChange =
[FSTDocumentViewChange changeWithDocument:change.document
type:FSTDocumentViewChangeTypeModified];
self.changeMap = [self.changeMap dictionaryBySettingObject:newChange forKey:key];
} else {
// This includes these cases, which don't make sense:
// Added -> Added
// Removed -> Removed
// Modified -> Added
// Removed -> Modified
// Metadata -> Added
// Removed -> Metadata
FSTFail(@"Unsupported combination of changes: %ld after %ld", (long)change.type,
(long)oldChange.type);
}
}
- (NSArray<FSTDocumentViewChange *> *)changes {
NSMutableArray<FSTDocumentViewChange *> *changes = [NSMutableArray array];
[self.changeMap enumerateKeysAndObjectsUsingBlock:^(FSTDocumentKey *key,
FSTDocumentViewChange *change, BOOL *stop) {
[changes addObject:change];
}];
return changes;
}
@end
#pragma mark - FSTViewSnapshot
@implementation FSTViewSnapshot
- (instancetype)initWithQuery:(FSTQuery *)query
documents:(FSTDocumentSet *)documents
oldDocuments:(FSTDocumentSet *)oldDocuments
documentChanges:(NSArray<FSTDocumentViewChange *> *)documentChanges
fromCache:(BOOL)fromCache
hasPendingWrites:(BOOL)hasPendingWrites
syncStateChanged:(BOOL)syncStateChanged {
self = [super init];
if (self) {
_query = query;
_documents = documents;
_oldDocuments = oldDocuments;
_documentChanges = documentChanges;
_fromCache = fromCache;
_hasPendingWrites = hasPendingWrites;
_syncStateChanged = syncStateChanged;
}
return self;
}
- (NSString *)description {
return [NSString stringWithFormat:
@"<FSTViewSnapshot query:%@ documents:%@ oldDocument:%@ changes:%@ "
"fromCache:%@ hasPendingWrites:%@ syncStateChanged:%@>",
self.query, self.documents, self.oldDocuments, self.documentChanges,
(self.fromCache ? @"YES" : @"NO"), (self.hasPendingWrites ? @"YES" : @"NO"),
(self.syncStateChanged ? @"YES" : @"NO")];
}
- (BOOL)isEqual:(id)object {
if (self == object) {
return YES;
} else if (![object isKindOfClass:[FSTViewSnapshot class]]) {
return NO;
}
FSTViewSnapshot *other = object;
return [self.query isEqual:other.query] && [self.documents isEqual:other.documents] &&
[self.oldDocuments isEqual:other.oldDocuments] &&
[self.documentChanges isEqualToArray:other.documentChanges] &&
self.fromCache == other.fromCache && self.hasPendingWrites == other.hasPendingWrites &&
self.syncStateChanged == other.syncStateChanged;
}
- (NSUInteger)hash {
NSUInteger result = [self.query hash];
result = 31 * result + [self.documents hash];
result = 31 * result + [self.oldDocuments hash];
result = 31 * result + [self.documentChanges hash];
result = 31 * result + (self.fromCache ? 1231 : 1237);
result = 31 * result + (self.hasPendingWrites ? 1231 : 1237);
result = 31 * result + (self.syncStateChanged ? 1231 : 1237);
return result;
}
@end
NS_ASSUME_NONNULL_END
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