mirror of
https://github.com/firebase/firebase-ios-sdk
synced 2026-11-09 22:36:01 +05:45
116 lines
4.3 KiB
Objective-C
116 lines
4.3 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 "FServerValues.h"
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#import "FChildrenNode.h"
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#import "FConstants.h"
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#import "FLeafNode.h"
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#import "FSnapshotUtilities.h"
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@implementation FServerValues
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+ (NSDictionary *)generateServerValues:(id<FClock>)clock {
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long long millis = (long long)([clock currentTime] * 1000);
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return @{@"timestamp" : [NSNumber numberWithLongLong:millis]};
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}
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+ (id)resolveDeferredValue:(id)val
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withServerValues:(NSDictionary *)serverValues {
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if ([val isKindOfClass:[NSDictionary class]]) {
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NSDictionary *dict = val;
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if (dict[kServerValueSubKey] != nil) {
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NSString *serverValueType = [dict objectForKey:kServerValueSubKey];
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if (serverValues[serverValueType] != nil) {
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return [serverValues objectForKey:serverValueType];
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} else {
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// TODO: Throw unrecognizedServerValue error here
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}
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}
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}
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return val;
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}
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+ (FCompoundWrite *)resolveDeferredValueCompoundWrite:(FCompoundWrite *)write
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withServerValues:
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(NSDictionary *)serverValues {
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__block FCompoundWrite *resolved = write;
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[write enumerateWrites:^(FPath *path, id<FNode> node, BOOL *stop) {
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id<FNode> resolvedNode =
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[FServerValues resolveDeferredValueSnapshot:node
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withServerValues:serverValues];
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// Node actually changed, use pointer inequality here
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if (resolvedNode != node) {
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resolved = [resolved addWrite:resolvedNode atPath:path];
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}
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}];
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return resolved;
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}
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+ (id)resolveDeferredValueTree:(FSparseSnapshotTree *)tree
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withServerValues:(NSDictionary *)serverValues {
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FSparseSnapshotTree *resolvedTree = [[FSparseSnapshotTree alloc] init];
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[tree
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forEachTreeAtPath:[FPath empty]
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do:^(FPath *path, id<FNode> node) {
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[resolvedTree
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rememberData:
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[FServerValues
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resolveDeferredValueSnapshot:node
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withServerValues:serverValues]
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onPath:path];
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}];
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return resolvedTree;
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}
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+ (id<FNode>)resolveDeferredValueSnapshot:(id<FNode>)node
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withServerValues:(NSDictionary *)serverValues {
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id priorityVal =
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[FServerValues resolveDeferredValue:[[node getPriority] val]
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withServerValues:serverValues];
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id<FNode> priority = [FSnapshotUtilities nodeFrom:priorityVal];
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if ([node isLeafNode]) {
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id value = [self resolveDeferredValue:[node val]
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withServerValues:serverValues];
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if (![value isEqual:[node val]] ||
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![priority isEqual:[node getPriority]]) {
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return [[FLeafNode alloc] initWithValue:value
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withPriority:priority];
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} else {
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return node;
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}
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} else {
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__block FChildrenNode *newNode = node;
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if (![priority isEqual:[node getPriority]]) {
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newNode = [newNode updatePriority:priority];
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}
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[node enumerateChildrenUsingBlock:^(NSString *childKey,
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id<FNode> childNode, BOOL *stop) {
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id newChildNode =
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[FServerValues resolveDeferredValueSnapshot:childNode
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withServerValues:serverValues];
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if (![newChildNode isEqual:childNode]) {
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newNode = [newNode updateImmediateChild:childKey
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withNewChild:newChildNode];
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}
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}];
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return newNode;
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}
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}
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@end
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