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package org.pdfbox.examples.util;
import org.pdfbox.pdfparser.PDFStreamParser;
import org.pdfbox.pdfwriter.ContentStreamWriter;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.pdmodel.PDPage;
import org.pdfbox.pdmodel.common.PDStream;
import org.pdfbox.util.PDFOperator;
import java.util.ArrayList;
import java.util.List;
/**
* This is an example on how to remove all text from PDF document.
*
* Usage: java org.pdfbox.examples.util.RemoveAllText <input-pdf> <output-pdf>
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @version $Revision: 1.2 $
*/
public class RemoveAllText
{
/**
* Default constructor.
*/
private RemoveAllText()
{
//example class should not be instantiated
}
/**
* This will remove all text from a PDF document.
*
* @param args The command line arguments.
*
* @throws Exception If there is an error parsing the document.
*/
public static void main( String[] args ) throws Exception
{
if( args.length != 2 )
{
usage();
}
else
{
PDDocument document = null;
try
{
document = PDDocument.load( args[0] );
if( document.isEncrypted() )
{
System.err.println( "Error: Encrypted documents are not supported for this example." );
System.exit( 1 );
}
List allPages = document.getDocumentCatalog().getAllPages();
for( int i=0; i<allPages.size(); i++ )
{
PDPage page = (PDPage)allPages.get( i );
PDFStreamParser parser = new PDFStreamParser(page.getContents());
parser.parse();
List tokens = parser.getTokens();
List newTokens = new ArrayList();
for( int j=0; j<tokens.size(); j++)
{
Object token = tokens.get( j );
if( token instanceof PDFOperator )
{
PDFOperator op = (PDFOperator)token;
if( op.getOperation().equals( "TJ") || op.getOperation().equals( "Tj" ))
{
//remove the one argument to this operator
newTokens.remove( newTokens.size() -1 );
continue;
}
}
newTokens.add( token );
}
PDStream newContents = new PDStream( document );
ContentStreamWriter writer = new ContentStreamWriter( newContents.createOutputStream() );
writer.writeTokens( newTokens );
newContents.addCompression();
page.setContents( newContents );
}
document.save( args[1] );
}
finally
{
if( document != null )
{
document.close();
}
}
}
}
/**
* This will print the usage for this document.
*/
private static void usage()
{
System.err.println( "Usage: java org.pdfbox.examples.pdmodel.RemoveAllText <input-pdf> <output-pdf>" );
}
}