94 lines
3.6 KiB
Objective-C
94 lines
3.6 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 "FConstants.h"
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#import "FLeafNode.h"
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#import "FChildrenNode.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 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 withServerValues:(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 = [FServerValues resolveDeferredValueSnapshot:node 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 withServerValues:(NSDictionary*)serverValues {
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FSparseSnapshotTree* resolvedTree = [[FSparseSnapshotTree alloc] init];
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[tree forEachTreeAtPath:[FPath empty] do:^(FPath* path, id<FNode> node) {
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[resolvedTree rememberData:[FServerValues resolveDeferredValueSnapshot:node withServerValues:serverValues] 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 withServerValues:(NSDictionary*)serverValues {
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id priorityVal = [FServerValues resolveDeferredValue:[[node getPriority] val] 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] withServerValues:serverValues];
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if (![value isEqual:[node val]] || ![priority isEqual:[node getPriority]]) {
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return [[FLeafNode alloc] initWithValue:value 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, id<FNode> childNode, BOOL *stop) {
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id newChildNode = [FServerValues resolveDeferredValueSnapshot:childNode withServerValues:serverValues];
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if (![newChildNode isEqual:childNode]) {
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newNode = [newNode updateImmediateChild:childKey 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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