Android Open Source - RZAndroidBaseUtils Prefixed Image Cache Adapter

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License

The source code is released under:

MIT License

Java Source Code

package com.raizlabs.imagecaching;
/*from ww  w. j  a  v  a  2  s  . c  o  m*/
import java.util.HashSet;

import android.graphics.Bitmap;

/**
 * Adapter {@link ImageCache} which stores its images inside another
 * {@link ImageCache}, prefixed by a given string. Think of this as
 * creating a "folder" inside the other {@link ImageCache}.
 * 
 * @author Dylan James
 *
 */
public class PrefixedImageCacheAdapter implements ImageCache {

  /**
   * Our outer cache
   */
  private ImageCache cache;
  
  /**
   * The prefix we use
   */
  private String prefix;
  
  private HashSet<String> addedKeys;
  
  /**
   * Creates a {@link PrefixedImageCacheAdapter} which uses the given
   * prefix inside the given {@link ImageCache}
   * @param prefix The prefix to use on each item passed through this cache
   * @param cache The {@link ImageCache} to store images in
   */
  public PrefixedImageCacheAdapter(String prefix, ImageCache cache) {
    this.prefix = prefix;
    this.cache = cache;
    this.addedKeys = new HashSet<String>(); 
  }
  
  @Override
  public void addImage(String imageName, Bitmap bitmap) {
    String imageKey = prefix + imageName;
    cache.addImage(imageKey, bitmap);
    addedKeys.add(imageKey);
  }

  @Override
  public Bitmap getImage(String imageName) {
    return cache.getImage(prefix + imageName);
  }

  @Override
  public Bitmap remove(String imageName) {
    String imageKey = prefix + imageName;
    addedKeys.remove(imageKey);
    return cache.remove(imageKey);
  }

  @Override
  public void purge() {
    for (String key : addedKeys) {
      cache.remove(key);
    }
    addedKeys.clear();
  }
}

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