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#import "Firestore/third_party/Immutable/FSTLLRBEmptyNode.h"
#import "Firestore/third_party/Immutable/FSTLLRBValueNode.h"
NS_ASSUME_NONNULL_BEGIN
@implementation FSTLLRBEmptyNode
- (NSString *)description {
return @"[empty node]";
}
+ (instancetype)emptyNode {
static dispatch_once_t pred = 0;
__strong static id _sharedObject = nil;
dispatch_once(&pred, ^{
_sharedObject = [[self alloc] init]; // or some other init method
});
return _sharedObject;
}
- (nullable id)key {
return nil;
}
- (nullable id)value {
return nil;
}
- (FSTLLRBColor)color {
return FSTLLRBColorUnspecified;
}
- (nullable id<FSTLLRBNode>)left {
return nil;
}
- (nullable id<FSTLLRBNode>)right {
return nil;
}
- (instancetype)copyWith:(id _Nullable)aKey
withValue:(id _Nullable)aValue
withColor:(FSTLLRBColor)aColor
withLeft:(id<FSTLLRBNode> _Nullable)aLeft
withRight:(id<FSTLLRBNode> _Nullable)aRight {
// This class is a singleton anyway, so this is more efficient than calling the constructor again.
return self;
}
- (id<FSTLLRBNode>)insertKey:(id)aKey forValue:(id)aValue withComparator:(NSComparator)aComparator {
FSTLLRBValueNode *result = [[FSTLLRBValueNode alloc] initWithKey:aKey
withValue:aValue
withColor:FSTLLRBColorUnspecified
withLeft:nil
withRight:nil];
return result;
}
- (id<FSTLLRBNode>)remove:(id)key withComparator:(NSComparator)aComparator {
return self;
}
- (NSUInteger)count {
return 0;
}
- (BOOL)isEmpty {
return YES;
}
- (BOOL)inorderTraversal:(BOOL (^)(id key, id value))action {
return NO;
}
- (BOOL)reverseTraversal:(BOOL (^)(id key, id value))action {
return NO;
}
- (id<FSTLLRBNode>)min {
return self;
}
- (nullable id)minKey {
return nil;
}
- (nullable id)maxKey {
return nil;
}
- (BOOL)isRed {
return NO;
}
- (int)check {
return 0;
}
@end
NS_ASSUME_NONNULL_END
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