content: 
  package com.banrossyn.imageloader.cache.disc;
  
  import android.graphics.Bitmap;
  import com.banrossyn.imageloader.utils.IoUtils;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  
  /**
   * Interface for disk cache
   *
   */
  public interface DiskCache {
  	/**
  	 * Returns root directory of disk cache
  	 *
  	 * @return Root directory of disk cache
  	 */
  	File getDirectory();
  
  	/**
  	 * Returns file of cached image
  	 *
  	 * @param imageUri Original image URI
  	 * @return File of cached image or <b>null</b> if image wasn't cached
  	 */
  	File get(String imageUri);
  
  	/**
  	 * Saves image stream in disk cache.
  	 * Incoming image stream shouldn't be closed in this method.
  	 *
  	 * @param imageUri    Original image URI
  	 * @param imageStream Input stream of image (shouldn't be closed in this method)
  	 * @param listener    Listener for saving progress, can be ignored if you don't use
  	 *                    {@linkplain com.banrossyn.imageloader.core.listener.ImageLoadingProgressListener
  	 *                    progress listener} in ImageLoader calls
  	 * @return <b>true</b> - if image was saved successfully; <b>false</b> - if image wasn't saved in disk cache.
  	 * @throws java.io.IOException
  	 */
  	boolean save(String imageUri, InputStream imageStream, IoUtils.CopyListener listener) throws IOException;
  
  	/**
  	 * Saves image bitmap in disk cache.
  	 *
  	 * @param imageUri Original image URI
  	 * @param bitmap   Image bitmap
  	 * @return <b>true</b> - if bitmap was saved successfully; <b>false</b> - if bitmap wasn't saved in disk cache.
  	 * @throws IOException
  	 */
  	boolean save(String imageUri, Bitmap bitmap) throws IOException;
  
  	/**
  	 * Removes image file associated with incoming URI
  	 *
  	 * @param imageUri Image URI
  	 * @return <b>true</b> - if image file is deleted successfully; <b>false</b> - if image file doesn't exist for
  	 * incoming URI or image file can't be deleted.
  	 */
  	boolean remove(String imageUri);
  
  	/** Closes disk cache, releases resources. */
  	void close();
  
  	/** Clears disk cache. */
  	void clear();
  }
  