mirror of
https://github.com/firebase/firebase-ios-sdk
synced 2026-11-09 22:36:01 +05:45
124 lines
3.3 KiB
Objective-C
124 lines
3.3 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 "FKeyIndex.h"
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#import "FEmptyNode.h"
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#import "FNamedNode.h"
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#import "FSnapshotUtilities.h"
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#import "FUtilities.h"
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@interface FKeyIndex ()
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@property(nonatomic, strong) FNamedNode *maxPost;
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@end
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@implementation FKeyIndex
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- (id)init {
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self = [super init];
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if (self) {
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self.maxPost = [[FNamedNode alloc] initWithName:[FUtilities maxName]
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andNode:[FEmptyNode emptyNode]];
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}
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return self;
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}
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- (NSComparisonResult)compareKey:(NSString *)key1
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andNode:(id<FNode>)node1
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toOtherKey:(NSString *)key2
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andNode:(id<FNode>)node2 {
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return [FUtilities compareKey:key1 toKey:key2];
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}
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- (NSComparisonResult)compareKey:(NSString *)key1
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andNode:(id<FNode>)node1
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toOtherKey:(NSString *)key2
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andNode:(id<FNode>)node2
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reverse:(BOOL)reverse {
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if (reverse) {
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return [self compareKey:key2
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andNode:node2
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toOtherKey:key1
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andNode:node1];
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} else {
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return [self compareKey:key1
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andNode:node1
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toOtherKey:key2
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andNode:node2];
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}
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}
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- (NSComparisonResult)compareNamedNode:(FNamedNode *)namedNode1
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toNamedNode:(FNamedNode *)namedNode2 {
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return [self compareKey:namedNode1.name
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andNode:namedNode1.node
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toOtherKey:namedNode2.name
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andNode:namedNode2.node];
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}
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- (BOOL)isDefinedOn:(id<FNode>)node {
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return YES;
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}
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- (BOOL)indexedValueChangedBetween:(id<FNode>)oldNode and:(id<FNode>)newNode {
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return NO; // The key for a node never changes.
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}
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- (FNamedNode *)minPost {
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return [FNamedNode min];
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}
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- (FNamedNode *)makePost:(id<FNode>)indexValue name:(NSString *)name {
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NSString *key = indexValue.val;
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NSAssert([key isKindOfClass:[NSString class]],
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@"KeyIndex indexValue must always be a string.");
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// We just use empty node, but it'll never be compared, since our comparator
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// only looks at name.
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return [[FNamedNode alloc] initWithName:key andNode:[FEmptyNode emptyNode]];
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}
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- (NSString *)queryDefinition {
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return @".key";
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}
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- (NSString *)description {
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return @"FKeyIndex";
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}
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- (id)copyWithZone:(NSZone *)zone {
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return self;
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}
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- (BOOL)isEqual:(id)other {
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// since we're a singleton.
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return (other == self);
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}
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- (NSUInteger)hash {
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return [@".key" hash];
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}
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+ (id<FIndex>)keyIndex {
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static id<FIndex> keyIndex;
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static dispatch_once_t once;
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dispatch_once(&once, ^{
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keyIndex = [[FKeyIndex alloc] init];
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});
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return keyIndex;
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}
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@end
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