60 lines
1.3 KiB
Objective-C
60 lines
1.3 KiB
Objective-C
//
|
|
// MPArrayCache.m
|
|
// MathPad
|
|
//
|
|
// Created by Kim Wittenburg on 31.08.14.
|
|
// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
|
|
//
|
|
|
|
#import "MPArrayCache.h"
|
|
|
|
@implementation MPArrayCache {
|
|
NSUInteger lastIndex;
|
|
}
|
|
|
|
- (instancetype)init
|
|
{
|
|
self = [super init];
|
|
if (self) {
|
|
lastIndex = 0;
|
|
_cache = [[NSCache alloc] init];
|
|
}
|
|
return self;
|
|
}
|
|
|
|
- (void)cacheObject:(id)object
|
|
forIndex:(NSUInteger)index
|
|
{
|
|
[_cache setObject:object
|
|
forKey:@(index)];
|
|
if (index > lastIndex) {
|
|
lastIndex = index;
|
|
}
|
|
}
|
|
|
|
- (id)cachedObjectForIndex:(NSUInteger)index
|
|
{
|
|
return [_cache objectForKey:@(index)];
|
|
}
|
|
|
|
- (void)clearCacheAtIndex:(NSUInteger)index replacementLength:(NSUInteger)replacementLength
|
|
{
|
|
[_cache removeObjectForKey:@(index)];
|
|
for (NSUInteger i = index+1; i < lastIndex; i++) {
|
|
id object = [_cache objectForKey:@(i)];
|
|
if (object) {
|
|
[_cache removeObjectForKey:@(i)];
|
|
}
|
|
}
|
|
lastIndex += replacementLength - 1;
|
|
}
|
|
|
|
- (void)clearCacheInRange:(NSRange)range replacementLength:(NSUInteger)replacementLength;
|
|
|
|
- (void)replaceCachedObjectAtIndex:(NSUInteger)index
|
|
withObjects:(NSArray *)objects;
|
|
- (void)replaceCachedObjectsInRange:(NSRange)range
|
|
withObjects:(NSArray *)objects;
|
|
|
|
@end
|