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