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.jpeg;
  
  import com.drew.lang.annotations.NotNull;
  import com.drew.lang.annotations.Nullable;
  import com.drew.metadata.TagDescriptor;
  
  import static com.drew.metadata.jpeg.JpegDirectory.*;
  
  /**
   * Provides human-readable string versions of the tags stored in a JpegDirectory.
   * Thanks to Darrell Silver (www.darrellsilver.com) for the initial version of this class.
   *
   * @author Drew Noakes https://drewnoakes.com
   */
  @SuppressWarnings("WeakerAccess")
  public class JpegDescriptor extends TagDescriptor<JpegDirectory>
  {
      public JpegDescriptor(@NotNull JpegDirectory directory)
      {
          super(directory);
      }
  
      @Override
      @Nullable
      public String getDescription(int tagType)
      {
          switch (tagType)
          {
              case TAG_COMPRESSION_TYPE:
                  return getImageCompressionTypeDescription();
              case TAG_COMPONENT_DATA_1:
                  return getComponentDataDescription(0);
              case TAG_COMPONENT_DATA_2:
                  return getComponentDataDescription(1);
              case TAG_COMPONENT_DATA_3:
                  return getComponentDataDescription(2);
              case TAG_COMPONENT_DATA_4:
                  return getComponentDataDescription(3);
              case TAG_DATA_PRECISION:
                  return getDataPrecisionDescription();
              case TAG_IMAGE_HEIGHT:
                  return getImageHeightDescription();
              case TAG_IMAGE_WIDTH:
                  return getImageWidthDescription();
              default:
                  return super.getDescription(tagType);
          }
      }
  
      @Nullable
      public String getImageCompressionTypeDescription()
      {
          return getIndexedDescription(TAG_COMPRESSION_TYPE,
              "Baseline",
              "Extended sequential, Huffman",
              "Progressive, Huffman",
              "Lossless, Huffman",
              null, // no 4
              "Differential sequential, Huffman",
              "Differential progressive, Huffman",
              "Differential lossless, Huffman",
              "Reserved for JPEG extensions",
              "Extended sequential, arithmetic",
              "Progressive, arithmetic",
              "Lossless, arithmetic",
              null, // no 12
              "Differential sequential, arithmetic",
              "Differential progressive, arithmetic",
              "Differential lossless, arithmetic");
      }
  
      @Nullable
      public String getImageWidthDescription()
      {
          final String value = _directory.getString(TAG_IMAGE_WIDTH);
          if (value==null)
              return null;
          return value + " pixels";
      }
  
      @Nullable
      public String getImageHeightDescription()
      {
          final String value = _directory.getString(TAG_IMAGE_HEIGHT);
          if (value==null)
              return null;
          return value + " pixels";
      }
  
      @Nullable
      public String getDataPrecisionDescription()
      {
          final String value = _directory.getString(TAG_DATA_PRECISION);
          if (value==null)
              return null;
          return value + " bits";
      }
  
      @Nullable
      public String getComponentDataDescription(int componentNumber)
      {
          JpegComponent value = _directory.getComponent(componentNumber);
  
          if (value==null)
              return null;
  
          return value.getComponentName() + " component: " + value;
      }
  }
  