content: /*
   * Copyright (C) 2018 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 android.util.imagepool;
  
  import com.android.tools.layoutlib.annotations.Nullable;
  import com.android.tools.layoutlib.annotations.VisibleForTesting;
  
  import android.util.imagepool.ImagePool.Image.Orientation;
  
  import java.awt.image.BufferedImage;
  import java.lang.ref.SoftReference;
  import java.util.LinkedList;
  import java.util.Queue;
  
  /**
   * Data model for image pool. Bucket contains the list of same sized buffered image in soft ref.
   */
  /* private package */ class Bucket {
  
      @VisibleForTesting final Queue<SoftReference<BufferedImage>> mBufferedImageRef = new LinkedList<>();
  
      public boolean isEmpty() {
          return mBufferedImageRef.isEmpty();
      }
  
      @Nullable
      public BufferedImage remove() {
          if (mBufferedImageRef.isEmpty()) {
              return null;
          }
  
          SoftReference<BufferedImage> reference = mBufferedImageRef.remove();
          return reference == null ? null : reference.get();
      }
  
      public void offer(BufferedImage img) {
          mBufferedImageRef.offer(new SoftReference<>(img));
      }
  
      public void clear() {
          mBufferedImageRef.clear();
      }
  
      static class BucketCreationMetaData {
          public final int mWidth;
          public final int mHeight;
          public final int mType;
          public final int mNumberOfCopies;
          public final Orientation mOrientation;
          public final long mMaxCacheSize;
  
          BucketCreationMetaData(int width, int height, int type, int numberOfCopies,
                  Orientation orientation, long maxCacheSize) {
              mWidth = width;
              mHeight = height;
              mType = type;
              mNumberOfCopies = numberOfCopies;
              mOrientation = orientation;
              mMaxCacheSize = maxCacheSize;
          }
      }
  }