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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 "FMaxNode.h"
#import "FUtilities.h"
#import "FEmptyNode.h"
@implementation FMaxNode {
}
- (id) init {
self = [super init];
if (self) {
}
return self;
}
+ (id<FNode>) maxNode {
static FMaxNode *maxNode = nil;
static dispatch_once_t once;
dispatch_once(&once, ^{
maxNode = [[FMaxNode alloc] init];
});
return maxNode;
}
- (NSComparisonResult) compare:(id<FNode>)other {
if (other == self) {
return NSOrderedSame;
} else {
return NSOrderedDescending;
}
}
- (BOOL)isEqual:(id)other {
return other == self;
}
- (id<FNode>) getImmediateChild:(NSString *) childName {
return [FEmptyNode emptyNode];
}
- (BOOL) isEmpty {
return NO;
}
@end
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