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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/Local/FSTReferenceSet.h"
#import "Firestore/Source/Local/FSTDocumentReference.h"
#import "Firestore/Source/Model/FSTDocumentKey.h"
NS_ASSUME_NONNULL_BEGIN
#pragma mark - FSTReferenceSet
@interface FSTReferenceSet ()
/** A set of outstanding references to a document sorted by key. */
@property(nonatomic, strong) FSTImmutableSortedSet<FSTDocumentReference *> *referencesByKey;
/** A set of outstanding references to a document sorted by target ID (or batch ID). */
@property(nonatomic, strong) FSTImmutableSortedSet<FSTDocumentReference *> *referencesByID;
@end
@implementation FSTReferenceSet
#pragma mark - Initializer
- (instancetype)init {
self = [super init];
if (self) {
_referencesByKey =
[FSTImmutableSortedSet setWithComparator:FSTDocumentReferenceComparatorByKey];
_referencesByID = [FSTImmutableSortedSet setWithComparator:FSTDocumentReferenceComparatorByID];
}
return self;
}
#pragma mark - Testing helper methods
- (BOOL)isEmpty {
return [self.referencesByKey isEmpty];
}
- (NSUInteger)count {
return self.referencesByKey.count;
}
#pragma mark - Public methods
- (void)addReferenceToKey:(FSTDocumentKey *)key forID:(int)ID {
FSTDocumentReference *reference = [[FSTDocumentReference alloc] initWithKey:key ID:ID];
self.referencesByKey = [self.referencesByKey setByAddingObject:reference];
self.referencesByID = [self.referencesByID setByAddingObject:reference];
}
- (void)addReferencesToKeys:(FSTDocumentKeySet *)keys forID:(int)ID {
[keys enumerateObjectsUsingBlock:^(FSTDocumentKey *key, BOOL *stop) {
[self addReferenceToKey:key forID:ID];
}];
}
- (void)removeReferenceToKey:(FSTDocumentKey *)key forID:(int)ID {
[self removeReference:[[FSTDocumentReference alloc] initWithKey:key ID:ID]];
}
- (void)removeReferencesToKeys:(FSTDocumentKeySet *)keys forID:(int)ID {
[keys enumerateObjectsUsingBlock:^(FSTDocumentKey *key, BOOL *stop) {
[self removeReferenceToKey:key forID:ID];
}];
}
- (void)removeReferencesForID:(int)ID {
FSTDocumentKey *emptyKey = [FSTDocumentKey keyWithSegments:@[]];
FSTDocumentReference *start = [[FSTDocumentReference alloc] initWithKey:emptyKey ID:ID];
FSTDocumentReference *end = [[FSTDocumentReference alloc] initWithKey:emptyKey ID:(ID + 1)];
[self.referencesByID enumerateObjectsFrom:start
to:end
usingBlock:^(FSTDocumentReference *reference, BOOL *stop) {
[self removeReference:reference];
}];
}
- (void)removeAllReferences {
for (FSTDocumentReference *reference in self.referencesByKey.objectEnumerator) {
[self removeReference:reference];
}
}
- (void)removeReference:(FSTDocumentReference *)reference {
self.referencesByKey = [self.referencesByKey setByRemovingObject:reference];
self.referencesByID = [self.referencesByID setByRemovingObject:reference];
[self.garbageCollector addPotentialGarbageKey:reference.key];
}
- (FSTDocumentKeySet *)referencedKeysForID:(int)ID {
FSTDocumentKey *emptyKey = [FSTDocumentKey keyWithSegments:@[]];
FSTDocumentReference *start = [[FSTDocumentReference alloc] initWithKey:emptyKey ID:ID];
FSTDocumentReference *end = [[FSTDocumentReference alloc] initWithKey:emptyKey ID:(ID + 1)];
__block FSTDocumentKeySet *keys = [FSTDocumentKeySet keySet];
[self.referencesByID enumerateObjectsFrom:start
to:end
usingBlock:^(FSTDocumentReference *reference, BOOL *stop) {
keys = [keys setByAddingObject:reference.key];
}];
return keys;
}
- (BOOL)containsKey:(FSTDocumentKey *)key {
// Create a reference with a zero ID as the start position to find any document reference with
// this key.
FSTDocumentReference *reference = [[FSTDocumentReference alloc] initWithKey:key ID:0];
NSEnumerator<FSTDocumentReference *> *enumerator =
[self.referencesByKey objectEnumeratorFrom:reference];
FSTDocumentKey *_Nullable firstKey = [enumerator nextObject].key;
return [firstKey isEqual:reference.key];
}
@end
NS_ASSUME_NONNULL_END
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