/*
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* This file is part of the SDWebImage package.
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* (c) Olivier Poitrey <rs@dailymotion.com>
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* (c) Fabrice Aneche
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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#import <Foundation/Foundation.h>
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#import "SDWebImageCompat.h"
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@interface UIImage (ExtendedCacheData)
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/**
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Read and Write the extended object and bind it to the image. Which can hold some extra metadata like Image's scale factor, URL rich link, date, etc.
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The extended object should conforms to NSCoding, which we use `NSKeyedArchiver` and `NSKeyedUnarchiver` to archive it to data, and write to disk cache.
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@note The disk cache preserve both of the data and extended data with the same cache key. For manual query, use the `SDDiskCache` protocol method `extendedDataForKey:` instead.
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@note You can specify arbitrary object conforms to NSCoding (NSObject protocol here is used to support object using `NS_ROOT_CLASS`, which is not NSObject subclass). If you load image from disk cache, you should check the extended object class to avoid corrupted data.
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@warning This object don't need to implements NSSecureCoding (but it's recommended), because we allows arbitrary class.
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*/
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@property (nonatomic, strong, nullable) id<NSObject, NSCoding> sd_extendedObject;
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@end
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