SvgEnumerateElementsCallback Delegate

 
import java.io.ByteArrayInputStream; 
import java.io.ByteArrayOutputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.ObjectInputStream; 
import java.io.ObjectOutputStream; 
import java.io.PrintStream; 
import java.nio.file.FileVisitOption; 
import java.nio.file.Files; 
import java.nio.file.Path; 
import java.nio.file.Paths; 
import java.util.stream.Stream; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.document.writer.*; 
import leadtools.svg.*; 
 
 
public void svgDocumentEnumerateElementsExample() { 
   String LEAD_VARS_ImagesDir = "C:\\LEADTOOLS23\\Resources\\Images"; 
   // The source PDF file 
   String srcFilePath = combine(LEAD_VARS_ImagesDir, "Leadtools_pdf.svg"); 
   String beforeSvgFile = combine(LEAD_VARS_ImagesDir, "Leadtools_before.svg"); 
   String afterSvgFile = combine(LEAD_VARS_ImagesDir, "Leadtools_after.svg"); 
 
   // Assume this is our Virtual Directory 
   String virtualDirectory = "http://localhost/leadtools_images/svg/resources"; 
   // Assume this phrysical directory maps to the Virtual Directory 
   String physicalDirectory = combine(LEAD_VARS_ImagesDir, "svg\\resources"); 
 
   if (!new File(physicalDirectory).exists()) 
      new File(physicalDirectory).mkdirs(); 
 
   // Our SVG element enumartion callback 
   SvgEnumerateElementsCallback callback = (SvgDocument document, SvgNodeHandle node, Object userData) -> { 
      if (node.getElementType() == SvgElementType.IMAGE) { 
         // Get the href 
         String href = node.getAttributeValue("xlink:href"); 
         if (!href.isEmpty() || href != null) { 
            // Parse it as data URI 
            SvgDataUri dataUri = SvgDataUri.parse(href); 
            // Check if it is a data URI 
            if (dataUri.isDataUri()) { 
               // Yes, create a new file in a virtual directory 
 
               // Show the dataURI properties 
               System.out.println("Replacing data URI"); 
               System.out.println("Format:" + dataUri.getImageFormat()); 
               if (dataUri.getMediaLength() > 0) 
                  System.out.println( 
                        "Media:" + dataUri.getHref().substring(dataUri.getMediaOffset(), dataUri.getMediaLength())); 
               if (dataUri.getCharSetOffset() > 0) 
                  System.out.println( 
                        "CharSet:" 
                              + dataUri.getHref().substring(dataUri.getCharSetOffset(), dataUri.getCharSetLength())); 
               else 
                  System.out.println("CharSet: not set"); 
 
               System.out.println("IsBase64:" + dataUri.isBase64()); 
               System.out.println("ImageFormat:" + dataUri.getImageFormat()); 
               String extension = dataUri.getExtension(); 
               System.out.println("Extension:" + extension); 
 
               // Get a file name 
               String name = "dstSrcFile" + extension; 
 
               // Save it 
               // Full physical path 
               String filePath = combine(physicalDirectory, name); 
               dataUri.decodeToFile(filePath); 
 
               // Finally replace the attribute in the image element with the URI 
               String virtualPath = virtualDirectory + "/" + name; 
               node.setAttributeValue("xlink:href", virtualPath); 
            } else { 
               System.out.println("Does not contain a valid data URI"); 
            } 
         } 
      } 
      return true; 
   }; 
 
   RasterCodecs codecs = new RasterCodecs(); 
   // Use 300 DPI when loading document images 
   codecs.getOptions().getRasterizeDocument().getLoad().setResolution(300); 
   // Load the first page as SVG 
   SvgDocument svgDocument = (SvgDocument) codecs.loadSvg(srcFilePath, 1, null); 
 
   if (!svgDocument.isFlat()) 
      svgDocument.flat(null); 
   if (!svgDocument.getBounds().isValid()) 
      svgDocument.calculateBounds(false); 
 
   // Save this SVG to disk, report the size 
   svgDocument.saveToFile(beforeSvgFile, null); 
   System.out.println("Before unembedding the image, size is " + new File(beforeSvgFile).length()); 
 
   // Now enumerate the elements to replace each embedded image with a URL 
   // Since we are going to modify the SVG, call BeginUpdate/EndUpdate to speed up 
   // the process 
   svgDocument.beginUpdate(); 
   SvgEnumerateOptions svgEnumerateOptions = new SvgEnumerateOptions(); 
   svgEnumerateOptions.setEnumerateDirection(SvgEnumerateDirection.TOP_TO_BOTTOM); 
 
   svgDocument.enumerateElements(svgEnumerateOptions, callback, null); 
   svgDocument.endUpdate(); 
 
   // Save this SVG to disk again, report the size, should be alot smaller since 
   // the image are unembedded and stored as external resources 
   svgDocument.saveToFile(afterSvgFile, null); 
 
   System.out.println("After unembedding the image, size is " + new File(afterSvgFile).length()); 
   assertTrue(new File(afterSvgFile).length() != new File(beforeSvgFile).length()); 
}