module image.CachedLoader;

private {
	import image.Image;
	import image.Loader;
}



class CachedLoader : Loader {
	this (Loader cached) {
		assert (cached !is null);
		this.cached = cached;
	}
	
	
	Image load(char[] filename) {
		{
			Image* c = filename in cache;
			if (c !is null) {
				assert (*c !is null);
				return *c;
			}
		}
		
		Image im = cached.load(filename);
		if (im !is null) {
			cache[filename] = im;
		}
		
		return im;
	}
	
	
	protected {
		Loader				cached;
		Image[char[]]	cache;
	}
}