content: /*
   * Copyright 2002-2012 Drew Noakes
   *
   *    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.
   *
   * More information about this project is available at:
   *
   *    http://drewnoakes.com/code/exif/
   *    http://code.google.com/p/metadata-extractor/
   */
  package com.almalence.util.exifreader.metadata.jpeg;
  
  import com.almalence.util.exifreader.lang.annotations.Nullable;
  
  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 http://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
       */
      @Nullable
      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:
      			break;
          }
          return null;
      }
  
      public int getQuantizationTableNumber()
      {
          return _quantizationTableNumber;
      }
  
      public int getHorizontalSamplingFactor()
      {
          return _samplingFactorByte & 0x0F;
      }
  
      public int getVerticalSamplingFactor()
      {
          return (_samplingFactorByte>>4) & 0x0F;
      }
  }
  