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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/FSTMemoryRemoteDocumentCache.h"
#import "Firestore/Source/Core/FSTQuery.h"
#import "Firestore/Source/Model/FSTDocument.h"
#import "Firestore/Source/Model/FSTDocumentDictionary.h"
#include "Firestore/core/src/firebase/firestore/model/document_key.h"
using firebase::firestore::model::DocumentKey;
NS_ASSUME_NONNULL_BEGIN
@interface FSTMemoryRemoteDocumentCache ()
/** Underlying cache of documents. */
@property(nonatomic, strong) FSTMaybeDocumentDictionary *docs;
@end
@implementation FSTMemoryRemoteDocumentCache
- (instancetype)init {
if (self = [super init]) {
_docs = [FSTMaybeDocumentDictionary maybeDocumentDictionary];
}
return self;
}
- (void)addEntry:(FSTMaybeDocument *)document {
self.docs = [self.docs dictionaryBySettingObject:document forKey:document.key];
}
- (void)removeEntryForKey:(const DocumentKey &)key {
self.docs = [self.docs dictionaryByRemovingObjectForKey:key];
}
- (nullable FSTMaybeDocument *)entryForKey:(const DocumentKey &)key {
return self.docs[static_cast<FSTDocumentKey *>(key)];
}
- (FSTDocumentDictionary *)documentsMatchingQuery:(FSTQuery *)query {
FSTDocumentDictionary *result = [FSTDocumentDictionary documentDictionary];
// Documents are ordered by key, so we can use a prefix scan to narrow down the documents
// we need to match the query against.
FSTDocumentKey *prefix = [FSTDocumentKey keyWithPath:query.path.Append("")];
NSEnumerator<FSTDocumentKey *> *enumerator = [self.docs keyEnumeratorFrom:prefix];
for (FSTDocumentKey *key in enumerator) {
if (!query.path.IsPrefixOf(key.path)) {
break;
}
FSTMaybeDocument *maybeDoc = self.docs[key];
if (![maybeDoc isKindOfClass:[FSTDocument class]]) {
continue;
}
FSTDocument *doc = (FSTDocument *)maybeDoc;
if ([query matchesDocument:doc]) {
result = [result dictionaryBySettingObject:doc forKey:doc.key];
}
}
return result;
}
@end
NS_ASSUME_NONNULL_END
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