mirror of
https://github.com/firebase/firebase-ios-sdk
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56 lines
1.9 KiB
Objective-C
56 lines
1.9 KiB
Objective-C
/*
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* Copyright 2017 Google
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import <Foundation/Foundation.h>
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#import "FirebaseDatabase/Sources/FIndex.h"
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#import "FirebaseDatabase/Sources/FNamedNode.h"
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#import "FirebaseDatabase/Sources/Snapshot/FNode.h"
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/**
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* Represents a node together with an index. The index and node are updated in
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* unison. In the case where the index does not affect the ordering (i.e. the
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* ordering is identical to the key ordering) this class uses a fallback index
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* to save memory. Everything operating on the index must special case the
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* fallback index.
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*/
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@interface FIndexedNode : NSObject
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@property(nonatomic, strong, readonly) id<FNode> node;
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+ (FIndexedNode *)indexedNodeWithNode:(id<FNode>)node;
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+ (FIndexedNode *)indexedNodeWithNode:(id<FNode>)node index:(id<FIndex>)index;
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- (BOOL)hasIndex:(id<FIndex>)index;
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- (FIndexedNode *)updateChild:(NSString *)key
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withNewChild:(id<FNode>)newChildNode;
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- (FIndexedNode *)updatePriority:(id<FNode>)priority;
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- (FNamedNode *)firstChild;
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- (FNamedNode *)lastChild;
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- (NSString *)predecessorForChildKey:(NSString *)childKey
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childNode:(id<FNode>)childNode
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index:(id<FIndex>)index;
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- (void)enumerateChildrenReverse:(BOOL)reverse
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usingBlock:(void (^)(NSString *key, id<FNode> node,
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BOOL *stop))block;
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- (NSEnumerator *)childEnumerator;
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@end
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