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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/Model/FSTDocumentSet.h"
#import "Firestore/Source/Model/FSTDocument.h"
#import "Firestore/Source/Model/FSTDocumentKey.h"
#import "Firestore/third_party/Immutable/FSTImmutableSortedSet.h"
#include "Firestore/core/src/firebase/firestore/model/document_key.h"
using firebase::firestore::model::DocumentKey;
NS_ASSUME_NONNULL_BEGIN
/**
* The type of the index of the documents in an FSTDocumentSet.
* @see FSTDocumentSet#index
*/
typedef FSTImmutableSortedDictionary<FSTDocumentKey *, FSTDocument *> IndexType;
/**
* The type of the main collection of documents in an FSTDocumentSet.
* @see FSTDocumentSet#sortedSet
*/
typedef FSTImmutableSortedSet<FSTDocument *> SetType;
@interface FSTDocumentSet ()
- (instancetype)initWithIndex:(IndexType *)index set:(SetType *)sortedSet NS_DESIGNATED_INITIALIZER;
/**
* An index of the documents in the FSTDocumentSet, indexed by document key. The index
* exists to guarantee the uniqueness of document keys in the set and to allow lookup and removal
* of documents by key.
*/
@property(nonatomic, strong, readonly) IndexType *index;
/**
* The main collection of documents in the FSTDocumentSet. The documents are ordered by a
* comparator supplied from a query. The SetType collection exists in addition to the index to
* allow ordered traversal of the FSTDocumentSet.
*/
@property(nonatomic, strong, readonly) SetType *sortedSet;
@end
@implementation FSTDocumentSet
+ (instancetype)documentSetWithComparator:(NSComparator)comparator {
IndexType *index =
[FSTImmutableSortedDictionary dictionaryWithComparator:FSTDocumentKeyComparator];
SetType *set = [FSTImmutableSortedSet setWithComparator:comparator];
return [[FSTDocumentSet alloc] initWithIndex:index set:set];
}
- (instancetype)initWithIndex:(IndexType *)index set:(SetType *)sortedSet {
self = [super init];
if (self) {
_index = index;
_sortedSet = sortedSet;
}
return self;
}
- (BOOL)isEqual:(id)other {
if (other == self) {
return YES;
}
if (![other isMemberOfClass:[FSTDocumentSet class]]) {
return NO;
}
FSTDocumentSet *otherSet = (FSTDocumentSet *)other;
if ([self count] != [otherSet count]) {
return NO;
}
NSEnumerator<FSTDocument *> *selfIter = [self.sortedSet objectEnumerator];
NSEnumerator<FSTDocument *> *otherIter = [otherSet.sortedSet objectEnumerator];
FSTDocument *selfDoc = [selfIter nextObject];
FSTDocument *otherDoc = [otherIter nextObject];
while (selfDoc) {
if (![selfDoc isEqual:otherDoc]) {
return NO;
}
selfDoc = [selfIter nextObject];
otherDoc = [otherIter nextObject];
}
return YES;
}
- (NSUInteger)hash {
NSUInteger hash = 0;
for (FSTDocument *doc in self.sortedSet.objectEnumerator) {
hash = 31 * hash + [doc hash];
}
return hash;
}
- (NSString *)description {
return [self.sortedSet description];
}
- (NSUInteger)count {
return [self.index count];
}
- (BOOL)isEmpty {
return [self.index isEmpty];
}
- (BOOL)containsKey:(const DocumentKey &)key {
return [self.index objectForKey:(FSTDocumentKey *)key] != nil;
}
- (FSTDocument *_Nullable)documentForKey:(const DocumentKey &)key {
return [self.index objectForKey:(FSTDocumentKey *)key];
}
- (FSTDocument *_Nullable)firstDocument {
return [self.sortedSet firstObject];
}
- (FSTDocument *_Nullable)lastDocument {
return [self.sortedSet lastObject];
}
- (NSUInteger)indexOfKey:(const DocumentKey &)key {
FSTDocument *doc = [self.index objectForKey:(FSTDocumentKey *)key];
return doc ? [self.sortedSet indexOfObject:doc] : NSNotFound;
}
- (NSEnumerator<FSTDocument *> *)documentEnumerator {
return [self.sortedSet objectEnumerator];
}
- (NSArray *)arrayValue {
NSMutableArray<FSTDocument *> *result = [NSMutableArray arrayWithCapacity:self.count];
for (FSTDocument *doc in self.documentEnumerator) {
[result addObject:doc];
}
return result;
}
- (FSTMaybeDocumentDictionary *)dictionaryValue {
return self.index;
}
- (instancetype)documentSetByAddingDocument:(FSTDocument *_Nullable)document {
// TODO(mcg): look into making document nonnull.
if (!document) {
return self;
}
// Remove any prior mapping of the document's key before adding, preventing sortedSet from
// accumulating values that aren't in the index.
FSTDocumentSet *removed = [self documentSetByRemovingKey:document.key];
IndexType *index = [removed.index dictionaryBySettingObject:document forKey:document.key];
SetType *set = [removed.sortedSet setByAddingObject:document];
return [[FSTDocumentSet alloc] initWithIndex:index set:set];
}
- (instancetype)documentSetByRemovingKey:(const DocumentKey &)key {
FSTDocument *doc = [self.index objectForKey:(FSTDocumentKey *)key];
if (!doc) {
return self;
}
IndexType *index = [self.index dictionaryByRemovingObjectForKey:key];
SetType *set = [self.sortedSet setByRemovingObject:doc];
return [[FSTDocumentSet alloc] initWithIndex:index set:set];
}
@end
NS_ASSUME_NONNULL_END
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