mirror of
https://github.com/firebase/firebase-ios-sdk
synced 2026-11-10 22:45:59 +05:45
127 lines
3.7 KiB
Objective-C
127 lines
3.7 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 "FirebaseDatabase/Sources/FPriorityIndex.h"
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#import "FirebaseDatabase/Sources/FMaxNode.h"
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#import "FirebaseDatabase/Sources/FNamedNode.h"
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#import "FirebaseDatabase/Sources/Snapshot/FEmptyNode.h"
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#import "FirebaseDatabase/Sources/Snapshot/FLeafNode.h"
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#import "FirebaseDatabase/Sources/Snapshot/FNode.h"
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#import "FirebaseDatabase/Sources/Utilities/FUtilities.h"
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// TODO: Abstract into some common base class?
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@implementation FPriorityIndex
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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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id<FNode> child1 = [node1 getPriority];
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id<FNode> child2 = [node2 getPriority];
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NSComparisonResult indexCmp = [child1 compare:child2];
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if (indexCmp == NSOrderedSame) {
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return [FUtilities compareKey:key1 toKey:key2];
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} else {
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return indexCmp;
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}
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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 !node.getPriority.isEmpty;
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}
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- (BOOL)indexedValueChangedBetween:(id<FNode>)oldNode and:(id<FNode>)newNode {
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id<FNode> oldValue = [oldNode getPriority];
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id<FNode> newValue = [newNode getPriority];
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return ![oldValue isEqual:newValue];
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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 *)maxPost {
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return [self makePost:[FMaxNode maxNode] name:[FUtilities maxName]];
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}
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- (FNamedNode *)makePost:(id<FNode>)indexValue name:(NSString *)name {
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id<FNode> node = [[FLeafNode alloc] initWithValue:@"[PRIORITY-POST]"
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withPriority:indexValue];
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return [[FNamedNode alloc] initWithName:name andNode:node];
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}
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- (NSString *)queryDefinition {
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return @".priority";
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}
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- (NSString *)description {
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return @"FPriorityIndex";
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}
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- (id)copyWithZone:(NSZone *)zone {
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// Safe since we're immutable.
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return self;
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}
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- (BOOL)isEqual:(id)other {
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return [other isKindOfClass:[FPriorityIndex class]];
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}
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- (NSUInteger)hash {
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// chosen by a fair dice roll. Guaranteed to be random
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return 3155577;
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}
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+ (id<FIndex>)priorityIndex {
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static id<FIndex> index;
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static dispatch_once_t once;
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dispatch_once(&once, ^{
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index = [[FPriorityIndex alloc] init];
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});
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return index;
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}
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@end
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