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