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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/FSTDocumentDictionary.h"
#import "Firestore/Source/Model/FSTDocumentKey.h"
NS_ASSUME_NONNULL_BEGIN
@implementation FSTImmutableSortedDictionary (FSTMaybeDocumentDictionary)
+ (instancetype)maybeDocumentDictionary {
// Immutable dictionaries are contravariant in their value type, so just return a
// FSTDocumentDictionary here.
return [FSTDocumentDictionary documentDictionary];
}
+ (instancetype)documentDictionary {
static FSTDocumentDictionary *singleton;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
singleton = [FSTDocumentDictionary dictionaryWithComparator:FSTDocumentKeyComparator];
});
return singleton;
}
@end
NS_ASSUME_NONNULL_END
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