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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 "FPathIndex.h"
#import "FUtilities.h"
#import "FMaxNode.h"
#import "FEmptyNode.h"
#import "FSnapshotUtilities.h"
#import "FNamedNode.h"
#import "FPath.h"
@interface FPathIndex ()
@property (nonatomic, strong) FPath *path;
@end
@implementation FPathIndex
- (id) initWithPath:(FPath *)path {
self = [super init];
if (self) {
if (path.isEmpty || [path.getFront isEqualToString:@".priority"]) {
[NSException raise:NSInvalidArgumentException format:@"Invalid path for PathIndex: %@", path];
}
_path = path;
}
return self;
}
- (NSComparisonResult) compareKey:(NSString *)key1
andNode:(id<FNode>)node1
toOtherKey:(NSString *)key2
andNode:(id<FNode>)node2
{
id<FNode> child1 = [node1 getChild:self.path];
id<FNode> child2 = [node2 getChild:self.path];
NSComparisonResult indexCmp = [child1 compare:child2];
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 ![node getChild:self.path].isEmpty;
}
- (BOOL)indexedValueChangedBetween:(id <FNode>)oldNode and:(id <FNode>)newNode {
id<FNode> oldValue = [oldNode getChild:self.path];
id<FNode> newValue = [newNode getChild:self.path];
return [oldValue compare:newValue] != NSOrderedSame;
}
- (FNamedNode *)minPost {
return FNamedNode.min;
}
- (FNamedNode *)maxPost {
id<FNode> maxNode = [[FEmptyNode emptyNode] updateChild:self.path
withNewChild:[FMaxNode maxNode]];
return [[FNamedNode alloc] initWithName:[FUtilities maxName] andNode:maxNode];
}
- (FNamedNode*)makePost:(id<FNode>)indexValue name:(NSString*)name {
id<FNode> node = [[FEmptyNode emptyNode] updateChild:self.path withNewChild:indexValue];
return [[FNamedNode alloc] initWithName:name andNode:node];
}
- (NSString *)queryDefinition {
return [self.path wireFormat];
}
- (NSString *)description {
return [NSString stringWithFormat:@"FPathIndex(%@)", self.path];
}
- (id)copyWithZone:(NSZone *)zone {
// Safe since we're immutable.
return self;
}
- (BOOL) isEqual:(id)other {
if (![other isKindOfClass:[FPathIndex class]]) {
return NO;
}
return ([self.path isEqual:((FPathIndex*)other).path]);
}
- (NSUInteger) hash {
return [self.path hash];
}
@end
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