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These are Java extensions for use with the DocBook XML stylesheets and the Xalan-Java XSLT engine.

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package com.nwalsh.xalan;

import org.xml.sax.helpers.AttributesImpl;
import org.xml.sax.SAXException;
import org.w3c.dom.*;
import org.apache.xml.utils.DOMBuilder;
import com.nwalsh.xalan.Callout;
import org.apache.xml.utils.AttList;

/**
 * Utility class for the Verbatim extension (ignore this).
 *
 * $Id: FormatUnicodeCallout.java 7007 2007-07-11 07:09:12Z mzjn $
 *
 * Copyright (C) 2000, 2001 Norman Walsh.
 *
 * Change Log:
 * 
 * 1.0
 * Initial release.
 * 
 *
 * @author Norman Walsh
 * [email protected]
 *
 * @see Verbatim
 *
 * @version $Id: FormatUnicodeCallout.java 7007 2007-07-11 07:09:12Z mzjn $
 **/

public class FormatUnicodeCallout extends FormatCallout {
  int unicodeMax = 0;
  int unicodeStart = 0;
  String unicodeFont = "";

  public FormatUnicodeCallout(String font, int start, int max, boolean fo) {
    unicodeFont = font;
    unicodeMax = max;
    unicodeStart = start;
    stylesheetFO = fo;
  }

  public void formatCallout(DOMBuilder rtf,
			    Callout callout) {
    Element area = callout.getArea();
    int num = callout.getCallout();
    String label = areaLabel(area);
    String id = areaID(area);

    try {
      if (label == null && num <= unicodeMax) {
	AttributesImpl inAttr = new AttributesImpl();
	String ns = "";
	String prefix = "";
	String inName = "";

	if (!unicodeFont.equals("")) {
	  if (stylesheetFO) {
	    ns = foURI;
	    prefix = "fo:";
	    inName = "inline";
	    inAttr.addAttribute("", "", "font-family", "CDATA", unicodeFont);
	    inAttr.addAttribute("", "", "id", "ID", id);
	  } else {
	    inName = "font";
	    inAttr.addAttribute("", "", "face", "CDATA", unicodeFont);
	    inAttr.addAttribute("", "", "id", "ID", id);
	  }
	}

	char chars[] = new char[1];
	chars[0] = (char) (unicodeStart + num - 1);

	startSpan(rtf, id);
	if (!unicodeFont.equals("")) {
	  rtf.startElement(ns, inName, prefix+inName, inAttr);
	}
	rtf.characters(chars, 0, 1);
	if (!unicodeFont.equals("")) {
	  rtf.endElement(ns, inName, prefix+inName);
	}
	endSpan(rtf);
      } else {
	formatTextCallout(rtf, callout);
      }
    } catch (SAXException e) {
      System.out.println("SAX Exception in unicode formatCallout");
    }
  }
}