| Interface | Description | 
|---|---|
| ImageCache | Image cache object interface. | 
| ImageCacheHelper | |
| SimpleCacheHelper | 
| Class | Description | 
|---|---|
| CacheItem | Cache item information. | 
| DefaultImageCache | It's used to save the generated image cache index and the files location, etc, to help quickly search relevant cache object. | 
| ImageCacheHelperImpl | Cache image tool class, to provide image cache directory calculation way. | 
| SimpleCacheHelperImpl | 
The cache utility classes.