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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 "FKeyIndex.h"
#import "FNamedNode.h"
#import "FSnapshotUtilities.h"
#import "FUtilities.h"
#import "FEmptyNode.h"
@interface FKeyIndex ()
@property (nonatomic, strong) FNamedNode *maxPost;
@end
@implementation FKeyIndex
- (id)init {
self = [super init];
if (self) {
self.maxPost = [[FNamedNode alloc] initWithName:[FUtilities maxName] andNode:[FEmptyNode emptyNode]];
}
return self;
}
- (NSComparisonResult) compareKey:(NSString *)key1
andNode:(id<FNode>)node1
toOtherKey:(NSString *)key2
andNode:(id<FNode>)node2
{
return [FUtilities compareKey:key1 toKey:key2];
}
- (NSComparisonResult) compareKey:(NSString *)key1
andNode:(id<FNode>)node1
toOtherKey:(NSString *)key2
andNode:(id<FNode>)node2
reverse:(BOOL)reverse
{
if (reverse) {
return [self compareKey:key2 andNode:node2 toOtherKey:key1 andNode:node1];
} else {
return [self compareKey:key1 andNode:node1 toOtherKey:key2 andNode:node2];
}
}
- (NSComparisonResult) compareNamedNode:(FNamedNode *)namedNode1 toNamedNode:(FNamedNode *)namedNode2
{
return [self compareKey:namedNode1.name andNode:namedNode1.node toOtherKey:namedNode2.name andNode:namedNode2.node];
}
- (BOOL)isDefinedOn:(id <FNode>)node {
return YES;
}
- (BOOL)indexedValueChangedBetween:(id <FNode>)oldNode and:(id <FNode>)newNode {
return NO; // The key for a node never changes.
}
- (FNamedNode *)minPost {
return [FNamedNode min];
}
- (FNamedNode *)makePost:(id<FNode>)indexValue name:(NSString*)name {
NSString *key = indexValue.val;
NSAssert([key isKindOfClass:[NSString class]], @"KeyIndex indexValue must always be a string.");
// We just use empty node, but it'll never be compared, since our comparator only looks at name.
return [[FNamedNode alloc] initWithName:key andNode:[FEmptyNode emptyNode]];
}
- (NSString *) queryDefinition {
return @".key";
}
- (NSString *) description {
return @"FKeyIndex";
}
- (id)copyWithZone:(NSZone *)zone {
return self;
}
- (BOOL) isEqual:(id)other {
// since we're a singleton.
return (other == self);
}
- (NSUInteger) hash {
return [@".key" hash];
}
+ (id<FIndex>) keyIndex {
static id<FIndex> keyIndex;
static dispatch_once_t once;
dispatch_once(&once, ^{
keyIndex = [[FKeyIndex alloc] init];
});
return keyIndex;
}
@end
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