content: /*
   * Copyright (C) 2013 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package lb.listviewvariants.utils;
  
  import android.graphics.Bitmap;
  import android.os.Build;
  import android.support.v4.util.LruCache;
  import android.util.Log;
  
  import lb.listviewvariants.BuildConfig;
  
  /**
   * This class holds our bitmap caches (memory and disk).
   */
  public class ImageCache
    {
    private static final float CACHE_PERCENTAGE=0.1f;
    private static final String TAG="ImageCache";
    private LruCache<String,Bitmap> mMemoryCache;
    public static final ImageCache INSTANCE=new ImageCache(CACHE_PERCENTAGE);
  
    private ImageCache(float memCacheSizePercent)
      {
      init(memCacheSizePercent);
      }
  
    private void init(float memCacheSizePercent)
      {
      int memCacheSize=calculateMemCacheSize(memCacheSizePercent);
      // Set up memory cache
      if(BuildConfig.DEBUG)
        Log.d(TAG,"Memory cache created (size = "+memCacheSize+")");
      mMemoryCache=new LruCache<String,Bitmap>(memCacheSize)
      {
      @Override
      protected int sizeOf(String key,Bitmap bitmap)
        {
        final int bitmapSize=getBitmapSize(bitmap)/1024;
        return bitmapSize==0?1:bitmapSize;
        }
      };
      }
  
    public void addBitmapToCache(String data,Bitmap bitmap)
      {
      if(data==null||bitmap==null)
        return;
      // Add to memory cache
      if(mMemoryCache!=null&&mMemoryCache.get(data)==null)
        mMemoryCache.put(data,bitmap);
      }
  
    public Bitmap getBitmapFromMemCache(String data)
      {
      if(mMemoryCache!=null)
        {
        final Bitmap memBitmap=mMemoryCache.get(data);
        if(memBitmap!=null)
          {
          if(BuildConfig.DEBUG)
            Log.d(TAG,"Memory cache hit");
          return memBitmap;
          }
        }
      return null;
      }
  
    public static int getBitmapSize(Bitmap bitmap)
      {
      if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.HONEYCOMB_MR1)
        return bitmap.getByteCount();
      // Pre HC-MR1
      return bitmap.getRowBytes()*bitmap.getHeight();
      }
  
    public static int calculateMemCacheSize(float percent)
      {
      if(percent<0.05f||percent>0.8f)
        {
        throw new IllegalArgumentException("setMemCacheSizePercent - percent must be "
            +"between 0.05 and 0.8 (inclusive)");
        }
      return Math.round(percent*Runtime.getRuntime().maxMemory()/1024);
      }
  
    }
  