content: /*
   * Copyright 2002-2019 Drew Noakes and contributors
   *
   *    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
   *
   *        https://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.
   *
   * More information about this project is available at:
   *
   *    https://drewnoakes.com/code/exif/
   *    https://github.com/drewnoakes/metadata-extractor
   */
  package com.drew.imaging.heif;
  
  import com.drew.lang.SequentialReader;
  import com.drew.lang.annotations.NotNull;
  import com.drew.metadata.Metadata;
  import com.drew.metadata.heif.HeifDirectory;
  import com.drew.metadata.heif.boxes.Box;
  
  import java.io.IOException;
  
  public abstract class HeifHandler<T extends HeifDirectory>
  {
      protected Metadata metadata;
      protected T directory;
  
      public HeifHandler(Metadata metadata)
      {
          this.metadata = metadata;
          this.directory = getDirectory();
          metadata.addDirectory(directory);
      }
  
      protected abstract T getDirectory();
  
      protected abstract boolean shouldAcceptBox(@NotNull Box box);
  
      protected abstract boolean shouldAcceptContainer(@NotNull Box box);
  
      protected abstract HeifHandler<?> processBox(@NotNull Box box, @NotNull byte[] payload) throws IOException;
  
      /**
       * There is potential for a box to both contain other boxes and contain information, so this method will
       * handle those occurrences.
       */
      protected abstract void processContainer(@NotNull Box box, @NotNull SequentialReader reader) throws IOException;
  }
  