mirror of
https://github.com/firebase/firebase-ios-sdk
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72 lines
2.5 KiB
Objective-C
72 lines
2.5 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 "FMerge.h"
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#import "FOperationSource.h"
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#import "FPath.h"
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#import "FNode.h"
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#import "FOverwrite.h"
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#import "FCompoundWrite.h"
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@interface FMerge ()
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@property (nonatomic, strong, readwrite) FOperationSource *source;
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@property (nonatomic, readwrite) FOperationType type;
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@property (nonatomic, strong, readwrite) FPath *path;
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@property (nonatomic, strong) FCompoundWrite *children;
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@end
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@implementation FMerge
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@synthesize source;
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@synthesize type;
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@synthesize path;
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@synthesize children;
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- (id) initWithSource:(FOperationSource *)aSource path:(FPath *)aPath children:(FCompoundWrite *)someChildren {
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self = [super init];
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if (self) {
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self.source = aSource;
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self.type = FOperationTypeMerge;
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self.path = aPath;
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self.children = someChildren;
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}
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return self;
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}
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- (id<FOperation>) operationForChild:(NSString *)childKey {
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if ([self.path isEmpty]) {
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FCompoundWrite *childTree = [self.children childCompoundWriteAtPath:[[FPath alloc] initWith:childKey]];
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if (childTree.isEmpty) {
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return nil;
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} else if (childTree.rootWrite != nil) {
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// We have a snapshot for the child in question. This becomes an overwrite of the child.
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return [[FOverwrite alloc] initWithSource:self.source path:[FPath empty] snap:childTree.rootWrite];
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} else {
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// This is a merge at a deeper level
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return [[FMerge alloc] initWithSource:self.source path:[FPath empty] children:childTree];
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}
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} else {
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NSAssert([self.path.getFront isEqualToString:childKey], @"Can't get a merge for a child not on the path of the operation");
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return [[FMerge alloc] initWithSource:self.source path:[self.path popFront] children:self.children];
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}
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}
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- (NSString *) description {
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return [NSString stringWithFormat:@"FMerge { path=%@, soruce=%@ children=%@}", self.path, self.source, self.children];
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}
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@end
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