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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 "FValueIndex.h"
#import "FNamedNode.h"
#import "FSnapshotUtilities.h"
#import "FUtilities.h"
#import "FMaxNode.h"
@implementation FValueIndex
- (NSComparisonResult) compareKey:(NSString *)key1
andNode:(id<FNode>)node1
toOtherKey:(NSString *)key2
andNode:(id<FNode>)node2
{
NSComparisonResult indexCmp = [node1 compare:node2];
if (indexCmp == NSOrderedSame) {
return [FUtilities compareKey:key1 toKey:key2];
} else {
return indexCmp;
}
}
- (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 ![oldNode isEqual:newNode];
}
- (FNamedNode *)minPost {
return FNamedNode.min;
}
- (FNamedNode *)maxPost {
return FNamedNode.max;
}
- (FNamedNode *)makePost:(id<FNode>)indexValue name:(NSString*)name {
return [[FNamedNode alloc] initWithName:name andNode:indexValue];
}
- (NSString *)queryDefinition {
return @".value";
}
- (NSString *) description {
return @"FValueIndex";
}
- (id)copyWithZone:(NSZone *)zone {
return self;
}
- (BOOL) isEqual:(id)other {
// since we're a singleton.
return (other == self);
}
- (NSUInteger) hash {
return [@".value" hash];
}
+ (id<FIndex>) valueIndex {
static id<FIndex> valueIndex;
static dispatch_once_t once;
dispatch_once(&once, ^{
valueIndex = [[FValueIndex alloc] init];
});
return valueIndex;
}
@end
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