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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 "FChildChangeAccumulator.h"
#import "FChange.h"
#import "FIndex.h"
@interface FChildChangeAccumulator ()
@property (nonatomic, strong) NSMutableDictionary *changeMap;
@end
@implementation FChildChangeAccumulator
- (id) init {
self = [super init];
if (self) {
self.changeMap = [[NSMutableDictionary alloc] init];
}
return self;
}
- (void) trackChildChange:(FChange *)change {
FIRDataEventType type = change.type;
NSString *childKey = change.childKey;
NSAssert(type == FIRDataEventTypeChildAdded || type == FIRDataEventTypeChildChanged || type == FIRDataEventTypeChildRemoved, @"Only child changes supported for tracking.");
NSAssert(![change.childKey isEqualToString:@".priority"], @"Changes not tracked on priority");
if (self.changeMap[childKey] != nil) {
FChange *oldChange = [self.changeMap objectForKey:childKey];
FIRDataEventType oldType = oldChange.type;
if (type == FIRDataEventTypeChildAdded && oldType == FIRDataEventTypeChildRemoved) {
FChange *newChange = [[FChange alloc] initWithType:FIRDataEventTypeChildChanged
indexedNode:change.indexedNode
childKey:childKey
oldIndexedNode:oldChange.indexedNode];
[self.changeMap setObject:newChange forKey:childKey];
} else if (type == FIRDataEventTypeChildRemoved && oldType == FIRDataEventTypeChildAdded) {
[self.changeMap removeObjectForKey:childKey];
} else if (type == FIRDataEventTypeChildRemoved && oldType == FIRDataEventTypeChildChanged) {
FChange *newChange = [[FChange alloc] initWithType:FIRDataEventTypeChildRemoved
indexedNode:oldChange.oldIndexedNode
childKey:childKey];
[self.changeMap setObject:newChange forKey:childKey];
} else if (type == FIRDataEventTypeChildChanged && oldType == FIRDataEventTypeChildAdded) {
FChange *newChange = [[FChange alloc] initWithType:FIRDataEventTypeChildAdded
indexedNode:change.indexedNode
childKey:childKey];
[self.changeMap setObject:newChange forKey:childKey];
} else if (type == FIRDataEventTypeChildChanged && oldType == FIRDataEventTypeChildChanged) {
FChange *newChange = [[FChange alloc] initWithType:FIRDataEventTypeChildChanged
indexedNode:change.indexedNode
childKey:childKey
oldIndexedNode:oldChange.oldIndexedNode];
[self.changeMap setObject:newChange forKey:childKey];
} else {
NSString *reason = [NSString stringWithFormat:@"Illegal combination of changes: %@ occurred after %@", change, oldChange];
@throw [[NSException alloc] initWithName:@"FirebaseDatabaseInternalError" reason:reason userInfo:nil];
}
} else {
[self.changeMap setObject:change forKey:childKey];
}
}
- (NSArray *) changes {
return [self.changeMap allValues];
}
@end
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