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These are Java extensions for use with the DocBook XML stylesheets and the Saxon XSLT engine.
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package com.nwalsh.saxon;

import javax.xml.transform.TransformerException;

import com.icl.saxon.Controller;
import com.icl.saxon.om.NamePool;
import com.icl.saxon.tree.AttributeCollection;

/**
 * Saxon extension to scan the column widths in a result tree fragment.
 *
 * $Id: ColumnUpdateEmitter.java 8483 2009-07-13 20:33:56Z mzjn $
 *
 * Copyright (C) 2000 Norman Walsh.
 *
 * This class provides a
 * Saxon 6.*
 * implementation to scan the column widths in a result tree
 * fragment.
 *
 * The general design is this: the stylesheets construct a result tree
 * fragment for some colgroup environment. That result tree fragment
 * is "replayed" through the ColumnUpdateEmitter; the ColumnUpdateEmitter watches
 * the cols go by and extracts the column widths that it sees. These
 * widths are then made available.
 *
 * Change Log:
 * 
 * 1.0
 * Initial release.
 * 
 *
 * @author Norman Walsh
 * [email protected]
 *
 * @version $Id: ColumnUpdateEmitter.java 8483 2009-07-13 20:33:56Z mzjn $
 *
 */
public class ColumnUpdateEmitter extends CopyEmitter {
  /** The number of columns seen. */
  protected int numColumns = 0;
  protected String width[] = null;
  protected NamePool namePool = null;

  /** The FO namespace name. */
  protected static String foURI = "http://www.w3.org/1999/XSL/Format";
  /** The XHTML namespace name. */
  protected static String xhtmlURI = "http://www.w3.org/1999/xhtml";

  /** Construct a new ColumnUpdateEmitter. */
  public ColumnUpdateEmitter(Controller controller,
			     NamePool namePool,
			     String width[]) {
    super(controller, namePool);
    numColumns = 0;
    this.width = width;
    this.namePool = namePool;
  }

  /** Examine for column info. */
  public void startElement(int nameCode,
		    org.xml.sax.Attributes attributes,
		    int[] namespaces, int nscount)
    throws TransformerException {

    int thisFingerprint = namePool.getFingerprint(nameCode);
    int colFingerprint = namePool.getFingerprint("", "col");
    int XHTMLcolFingerprint = namePool.getFingerprint(xhtmlURI, "col");
    int foColFingerprint = namePool.getFingerprint(foURI, "table-column");

    if (thisFingerprint == colFingerprint || thisFingerprint == XHTMLcolFingerprint ) {
      AttributeCollection attr = new AttributeCollection(namePool, attributes);
      int widthFingerprint = namePool.getFingerprint("", "width");

      if (attr.getValueByFingerprint(widthFingerprint) == null) {
	attr.addAttribute(widthFingerprint, "CDATA", width[numColumns++]);
      } else {
	attr.setAttribute(widthFingerprint, "CDATA", width[numColumns++]);
      }
      attributes = attr;
    } else if (thisFingerprint == foColFingerprint) {
      AttributeCollection attr = new AttributeCollection(namePool, attributes);
      int widthFingerprint = namePool.getFingerprint("", "column-width");

      if (attr.getValueByFingerprint(widthFingerprint) == null) {
	attr.addAttribute(widthFingerprint, "CDATA", width[numColumns++]);
      } else {
	attr.setAttribute(widthFingerprint, "CDATA", width[numColumns++]);
      }
      attributes = attr;
    }

    rtfEmitter.startElement(nameCode, attributes, namespaces, nscount);
  }
}