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PDFBox: Counting the number of images in a document

/ Published in: Java
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Opens a PDF document and counts the number of images used on all pages.

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  1. /**
  2.  * @param args the command line arguments
  3.  * @throws java.io.IOException
  4.  */
  5. public static void main(String[] args) throws IOException {
  6.     PDDocument document = PDDocument.load(new File(""));
  7.  
  8.     int numImages = 0;
  9.     for (int i = 0; i < document.getNumberOfPages(); i++)
  10.     {
  11.         PDPage page = document.getPage(i);
  12.  
  13.         CountImages countImages = new CountImages(page);
  14.         countImages.processPage(page);
  15.  
  16.         numImages += countImages.numImages;
  17.     }
  18.  
  19.     System.out.println(numImages);
  20. }
  21.  
  22. static class CountImages extends PDFGraphicsStreamEngine {
  23.     public int numImages = 0;
  24.     private final Set<COSStream> duplicates = new HashSet<>();
  25.  
  26.     protected CountImages(PDPage page) throws IOException
  27.     {
  28.         super(page);
  29.     }
  30.  
  31.     @Override
  32.     public void appendRectangle(Point2D pd, Point2D pd1, Point2D pd2, Point2D pd3) throws IOException {
  33.     }
  34.  
  35.     @Override
  36.     public void drawImage(PDImage pdImage) throws IOException {
  37.         if (pdImage instanceof PDImageXObject) {
  38.             PDImageXObject xobject = (PDImageXObject)pdImage;
  39.  
  40.             if (duplicates.contains(xobject.getCOSObject()) == false) {
  41.                 numImages++;
  42.                 duplicates.add(xobject.getCOSObject());
  43.             }
  44.         } else {
  45.             numImages++; //means its an inline image
  46.         }
  47.     }
  48.  
  49.     @Override
  50.     public void clip(int i) throws IOException {
  51.     }
  52.  
  53.     @Override
  54.     public void moveTo(float f, float f1) throws IOException {
  55.     }
  56.  
  57.     @Override
  58.     public void lineTo(float f, float f1) throws IOException {
  59.     }
  60.  
  61.     @Override
  62.     public void curveTo(float f, float f1, float f2, float f3, float f4, float f5) throws IOException {
  63.     }
  64.  
  65.     @Override
  66.     public Point2D getCurrentPoint() throws IOException {
  67.         return new Point2D.Float(0, 0);
  68.     }
  69.  
  70.     @Override
  71.     public void closePath() throws IOException {
  72.     }
  73.  
  74.     @Override
  75.     public void endPath() throws IOException {
  76.     }
  77.  
  78.     @Override
  79.     public void strokePath() throws IOException {
  80.     }
  81.  
  82.     @Override
  83.     public void fillPath(int i) throws IOException {
  84.     }
  85.  
  86.     @Override
  87.     public void fillAndStrokePath(int i) throws IOException {
  88.     }
  89.  
  90.     @Override
  91.     public void shadingFill(COSName cosn) throws IOException {
  92.     }
  93. }

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