Android Open Source - Aviary-Android-SDK Simple Bitmap Cache

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Java Source Code

package com.aviary.android.feather.utils;
/*from  w w  w.  java 2  s.c  om*/
import java.lang.ref.SoftReference;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.concurrent.ConcurrentHashMap;

import android.graphics.Bitmap;
import android.os.Handler;

public class SimpleBitmapCache {

  private static final int DELAY_BEFORE_PURGE = 30 * 1000;
  private static final int HARD_CACHE_CAPACITY = 4;
  private final Handler purgeHandler = new Handler();

  private final HashMap<String, Bitmap> sHardBitmapCache = new LinkedHashMap<String, Bitmap>( HARD_CACHE_CAPACITY / 2, 0.75f, true ) {

    private static final long serialVersionUID = 7320831300767054723L;

    @Override
    protected boolean removeEldestEntry( LinkedHashMap.Entry<String, Bitmap> eldest ) {
      if ( size() > HARD_CACHE_CAPACITY ) {
        sSoftBitmapCache.put( eldest.getKey(), new SoftReference<Bitmap>( eldest.getValue() ) );
        return true;
      } else return false;
    }
  };

  private final static ConcurrentHashMap<String, SoftReference<Bitmap>> sSoftBitmapCache = new ConcurrentHashMap<String, SoftReference<Bitmap>>(
      HARD_CACHE_CAPACITY / 2 );

  public SimpleBitmapCache () {}

  public Bitmap getBitmapFromCache( String url ) {
    synchronized ( sHardBitmapCache ) {
      final Bitmap bitmap = sHardBitmapCache.get( url );
      if ( bitmap != null ) {
        sHardBitmapCache.remove( url );
        sHardBitmapCache.put( url, bitmap );
        return bitmap;
      }
    }

    SoftReference<Bitmap> bitmapReference = sSoftBitmapCache.get( url );
    if ( bitmapReference != null ) {
      final Bitmap bitmap = bitmapReference.get();
      if ( bitmap != null ) {
        return bitmap;
      } else {
        sSoftBitmapCache.remove( url );
      }
    }

    return null;
  }

  public void addBitmapToCache( String url, Bitmap bitmap ) {
    if ( bitmap != null ) {
      synchronized ( sHardBitmapCache ) {
        sHardBitmapCache.put( url, bitmap );
      }
    }
  }

  public void clearCache() {
    synchronized ( sHardBitmapCache ) {
      sHardBitmapCache.clear();
    }
    sSoftBitmapCache.clear();
  }

  public void resetPurgeTimer() {
    purgeHandler.removeCallbacks( mPurger );
    purgeHandler.postDelayed( mPurger, DELAY_BEFORE_PURGE );
  }

  private final Runnable mPurger = new Runnable() {

    @Override
    public void run() {
      clearCache();
    }
  };
}

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