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 java.io.Serializable;
  
  /**
   * Stores information about a JPEG image component such as the component id, horiz/vert sampling factor and
   * quantization table number.
   *
   * @author Drew Noakes https://drewnoakes.com
   */
  public class JpegComponent implements Serializable
  {
      private static final long serialVersionUID = 61121257899091914L;
  
      private final int _componentId;
      private final int _samplingFactorByte;
      private final int _quantizationTableNumber;
  
      public JpegComponent(int componentId, int samplingFactorByte, int quantizationTableNumber)
      {
          _componentId = componentId;
          _samplingFactorByte = samplingFactorByte;
          _quantizationTableNumber = quantizationTableNumber;
      }
  
      public int getComponentId()
      {
          return _componentId;
      }
  
      /**
       * Returns the component name (one of: Y, Cb, Cr, I, or Q)
       * @return the component name
       */
      @NotNull
      public String getComponentName()
      {
          switch (_componentId)
          {
              case 1:
                  return "Y";
              case 2:
                  return "Cb";
              case 3:
                  return "Cr";
              case 4:
                  return "I";
              case 5:
                  return "Q";
              default:
                  return String.format("Unknown (%s)", _componentId);
          }
      }
  
      public int getQuantizationTableNumber()
      {
          return _quantizationTableNumber;
      }
  
      public int getHorizontalSamplingFactor()
      {
          return (_samplingFactorByte>>4) & 0x0F;
      }
  
      public int getVerticalSamplingFactor()
      {
          return _samplingFactorByte & 0x0F;
      }
  
      @NotNull
      @Override
      public String toString() {
          return String.format(
              "Quantization table %d, Sampling factors %d horiz/%d vert",
              _quantizationTableNumber,
              getHorizontalSamplingFactor(),
              getVerticalSamplingFactor()
          );
      }
  }
  