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.metadata.jfif;
  
  import com.drew.lang.annotations.NotNull;
  import com.drew.lang.annotations.Nullable;
  import com.drew.metadata.TagDescriptor;
  
  import static com.drew.metadata.jfif.JfifDirectory.*;
  
  /**
   * Provides human-readable string versions of the tags stored in a JfifDirectory.
   *
   * <ul>
   *   <li>https://en.wikipedia.org/wiki/JPEG_File_Interchange_Format</li>
   *   <li>https://www.w3.org/Graphics/JPEG/jfif3.pdf</li>
   * </ul>
   *
   * @author Yuri Binev, Drew Noakes
   */
  @SuppressWarnings("WeakerAccess")
  public class JfifDescriptor extends TagDescriptor<JfifDirectory>
  {
      public JfifDescriptor(@NotNull JfifDirectory directory)
      {
          super(directory);
      }
  
      @Override
      @Nullable
      public String getDescription(int tagType)
      {
          switch (tagType) {
              case TAG_RESX:
                  return getImageResXDescription();
              case TAG_RESY:
                  return getImageResYDescription();
              case TAG_VERSION:
                  return getImageVersionDescription();
              case TAG_UNITS:
                  return getImageResUnitsDescription();
              default:
                  return super.getDescription(tagType);
          }
      }
  
      @Nullable
      public String getImageVersionDescription()
      {
          Integer value = _directory.getInteger(TAG_VERSION);
          if (value==null)
              return null;
          return String.format("%d.%d", (value & 0xFF00) >> 8, value & 0xFF);
      }
  
      @Nullable
      public String getImageResYDescription()
      {
          Integer value = _directory.getInteger(TAG_RESY);
          if (value==null)
              return null;
          return String.format("%d dot%s",
                  value,
                  value==1 ? "" : "s");
      }
  
      @Nullable
      public String getImageResXDescription()
      {
          Integer value = _directory.getInteger(TAG_RESX);
          if (value==null)
              return null;
          return String.format("%d dot%s",
                  value,
                  value==1 ? "" : "s");
      }
  
      @Nullable
      public String getImageResUnitsDescription()
      {
          Integer value = _directory.getInteger(TAG_UNITS);
          if (value==null)
              return null;
          switch (value) {
              case 0: return "none";
              case 1: return "inch";
              case 2: return "centimetre";
              default:
                  return "unit";
          }
      }
  }
  