code: /*
   *
   * $Id: PDFXref.java,v 1.2 2007/08/26 18:56:35 gil1 Exp $
   *
   * $Date: 2007/08/26 18:56:35 $
   *
   * 
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   * 
   */
  package pdf;
  
  /**
   * <p>This class is used to hold the xref information in the PDF
   * Trailer block.</p>
   *
   * <p>Basically, each object has an id, and an offset in the end file.</p>
   *
   * <p>See the Adobe PDF Manual for more information.  This class will 
   * normally not be used directly by a developer</p>
   *
   * @author Peter T. Mount
   * @author Eric Z. Beard, ericzbeard@hotmail.com
   * @version $Revision: 1.2 $, $Date: 2007/08/26 18:56:35 $
   *
   */
  public class PDFXref
  {
  
    /*
     * NOTE: Originally an inner class in PDF.java (now PDFDocument) written 
     * by Peter Mount for uk.org.retep.pdf
     */
  
    /**
     * The id of a PDF Object
     */
    public int id;
  
    /**
     * The offset within the PDF file
     */
    public int offset;
          
    /**
     * The generation of the object, usually 0
     */
    public int generation;
          
    /**
     * Creates a crossreference for a PDF Object
     * @param id The object's ID
     * @param offset The object's position in the file
     */
    public PDFXref(int id,int offset)
    {
      this(id,offset,0);
    }
          
    /**
     * Creates a crossreference for a PDF Object
     *
     * @param id The object's ID
     * @param offset The object's position in the file
     * @param generation The object's generation, usually 0
     */
    public PDFXref(int id,int offset,int generation)
    {
      this.id = id;
      this.offset = offset;
      this.generation = generation;
    }
          
    /**
     * @return The xref in the format of the xref section in the PDF file
     */
    public String toString()
    {
      String of = Integer.toString(offset);
      String ge = Integer.toString(generation);
      String rs = "0000000000".substring(0, 10-of.length()) + 
                  of + 
                  " " + 
                  "00000".substring(0,5-ge.length())+ge;
      if(generation==65535)
        return rs+" f ";
      return rs+" n ";
    }
  
  } // end class PDFXref
      
  