Picture Cache abstraction interface

PictureCache.java

import java.io.IOException;

import android.widget.ImageView;


public interface PictureCache<L, R extends RunningLoad, AUTH_COOKIE, AUTH_LOADER, VIEW_TYPE extends ImageView> {

	R load(VIEW_TYPE view, String imageUrl, PictureLoader loader, SizeConstraint sizeConstraint, AUTH_LOADER networkLoader, AUTH_COOKIE cookie, long freshness);

	void loadFromAnyThread(String imageUrl, PictureLoader loader, SizeConstraint sizeConstraint, AUTH_LOADER withAuth, AUTH_COOKIE cookie);
	boolean isAvailableWithoutDownload(String imageUrl, SizeConstraint sizeConstraint);
	void loadBytesInArray(String imageUrl, SizeConstraint sizeConstraint, Object[] array, int index, AUTH_COOKIE cookie);
	
	/**
	 * Save a picture from the cache into the Android Gallery
	 * @param imageUrl The URL corresponding to the image stored in the cache
	 * @return whether the picture was stored successfully
	 * @throws IOException
	 * @throws SecurityException
	 */
	boolean saveInGallery(String imageUrl, AUTH_COOKIE cookie) throws SecurityException;
	
	/**
	 * Get the {@link PictureLoader} that will perform the precache
	 */
	PictureLoader getPrecacheLoader();
	
	/**
	 * Clear the Bitmaps cached in memory
	 */
	void clearMemory();
	
	/**
	 * Remove all the data stored in the cache
	 */
	void clear();
}

PictureLoader.java

import android.graphics.drawable.BitmapDrawable;

public interface PictureLoader {

	void onShowBitmap(String url, BitmapDrawable bitmap, boolean doDisplay);
	
	void onShowDefault(boolean doDisplay);
	
	void onShowError(boolean doDisplay);
}

SizeConstraint.java

public interface SizeConstraint {
	
	public static enum SizeType {
		/** Use the picture in its original size to be deep zoomed */
		DEEP_ZOOM,
		/** Use the picture in its original size */
		ORIGINAL,
		/** Use the picture not to be bigger than the screen */
		FULLSCREEN,
		/** Resize the picture to fill an area of the specified width, keeping the aspect ratio */
		FILL_MAX_WIDTH,
		/** Resize the picture to fill an area of the specified height, keeping the aspect ratio */
		FILL_MAX_HEIGHT,
		/** Resize the picture to fill the whole area, keeping the aspect ratio */
		FILL_AREA,
	}

	SizeType getSizeType();
	int getWidthConstraint();
	int getHeightConstraint();
	
	public static final SizeConstraint DeepZoom = new SizeConstraint() {
		@Override
		public SizeType getSizeType() {
			return SizeType.DEEP_ZOOM;
		}
		public int getWidthConstraint() {
			return -1;
		}
		public int getHeightConstraint() {
			return -1;
		}
	};

	public static final SizeConstraint OriginalSize = new SizeConstraint() {
		@Override
		public SizeType getSizeType() {
			return SizeType.ORIGINAL;
		}
		public int getWidthConstraint() {
			return -1;
		}
		public int getHeightConstraint() {
			return -1;
		}
	};

	public static final SizeConstraint FullScreen = new SizeConstraint() {
		@Override
		public SizeType getSizeType() {
			return SizeType.FULLSCREEN;
		}
		public int getWidthConstraint() {
			return -1;
		}
		public int getHeightConstraint() {
			return -1;
		}
	};
}