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/*
* Copyright 2017 Google
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import "FServerValues.h"
#import "FConstants.h"
#import "FLeafNode.h"
#import "FChildrenNode.h"
#import "FSnapshotUtilities.h"
@implementation FServerValues
+ (NSDictionary*) generateServerValues:(id<FClock>)clock {
long long millis = (long long)([clock currentTime] * 1000);
return @{ @"timestamp": [NSNumber numberWithLongLong:millis] };
}
+ (id) resolveDeferredValue:(id)val withServerValues:(NSDictionary*)serverValues {
if ([val isKindOfClass:[NSDictionary class]]) {
NSDictionary* dict = val;
if (dict[kServerValueSubKey] != nil) {
NSString* serverValueType = [dict objectForKey:kServerValueSubKey];
if (serverValues[serverValueType] != nil) {
return [serverValues objectForKey:serverValueType];
} else {
// TODO: Throw unrecognizedServerValue error here
}
}
}
return val;
}
+ (FCompoundWrite *) resolveDeferredValueCompoundWrite:(FCompoundWrite *)write withServerValues:(NSDictionary *)serverValues {
__block FCompoundWrite *resolved = write;
[write enumerateWrites:^(FPath *path, id<FNode> node, BOOL *stop) {
id<FNode> resolvedNode = [FServerValues resolveDeferredValueSnapshot:node withServerValues:serverValues];
// Node actually changed, use pointer inequality here
if (resolvedNode != node) {
resolved = [resolved addWrite:resolvedNode atPath:path];
}
}];
return resolved;
}
+ (id) resolveDeferredValueTree:(FSparseSnapshotTree*)tree withServerValues:(NSDictionary*)serverValues {
FSparseSnapshotTree* resolvedTree = [[FSparseSnapshotTree alloc] init];
[tree forEachTreeAtPath:[FPath empty] do:^(FPath* path, id<FNode> node) {
[resolvedTree rememberData:[FServerValues resolveDeferredValueSnapshot:node withServerValues:serverValues] onPath:path];
}];
return resolvedTree;
}
+ (id<FNode>) resolveDeferredValueSnapshot:(id<FNode>)node withServerValues:(NSDictionary*)serverValues {
id priorityVal = [FServerValues resolveDeferredValue:[[node getPriority] val] withServerValues:serverValues];
id<FNode> priority = [FSnapshotUtilities nodeFrom:priorityVal];
if ([node isLeafNode]) {
id value = [self resolveDeferredValue:[node val] withServerValues:serverValues];
if (![value isEqual:[node val]] || ![priority isEqual:[node getPriority]]) {
return [[FLeafNode alloc] initWithValue:value withPriority:priority];
} else {
return node;
}
} else {
__block FChildrenNode* newNode = node;
if (![priority isEqual:[node getPriority]]) {
newNode = [newNode updatePriority:priority];
}
[node enumerateChildrenUsingBlock:^(NSString *childKey, id<FNode> childNode, BOOL *stop) {
id newChildNode = [FServerValues resolveDeferredValueSnapshot:childNode withServerValues:serverValues];
if (![newChildNode isEqual:childNode]) {
newNode = [newNode updateImmediateChild:childKey withNewChild:newChildNode];
}
}];
return newNode;
}
}
@end
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