content: /*
   * Copyright 2018 Andrey Novikov
   *
   * This program is free software: you can redistribute it and/or modify it under the
   * terms of the GNU Lesser General Public License as published by the Free Software
   * Foundation, either version 3 of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT ANY
   * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public License along with
   * this program. If not, see <http://www.gnu.org/licenses/>.
   *
   */
  
  package mobi.maptrek.util;
  
  import org.oscim.android.canvas.AndroidGraphics;
  import org.oscim.backend.canvas.Bitmap;
  
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  public class BitmapCache<K, V extends Bitmap> {
      private final LinkedHashMap<K,V> cache;
  
      BitmapCache(final int maxEntries) {
          this.cache = new LinkedHashMap<K,V>(maxEntries, 0.75f, true) {
              @Override
              protected boolean removeEldestEntry(Map.Entry<K,V> eldest){
                  return size() > maxEntries;
              }
          };
      }
  
      public void put(K key, V value) {
          synchronized(cache) {
              cache.put(key, value);
          }
      }
      public V get(K key) {
          synchronized(cache) {
              V bitmap = cache.get(key);
              if (bitmap != null && !AndroidGraphics.getBitmap(bitmap).isRecycled())
                  return bitmap;
              return null;
          }
      }
  
      public void clear() {
          synchronized (cache) {
              for (Bitmap bitmap : cache.values())
                  bitmap.recycle();
              cache.clear();
          }
      }
  }