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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.om.NamePool;

/**
 * Saxon extension to scan the column widths in a result tree fragment.
 *
 * $Id: ColumnScanEmitter.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 ColumnScanEmitter; the ColumnScanEmitter 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: ColumnScanEmitter.java 8483 2009-07-13 20:33:56Z mzjn $
 *
 */
public class ColumnScanEmitter extends com.icl.saxon.output.Emitter {
  /** The number of columns seen. */
  protected int numColumns = 0;
  protected String width[] = new String[5];
  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 ColumnScanEmitter. */
  public ColumnScanEmitter(NamePool namePool) {
    numColumns = 0;
    this.namePool = namePool;
  }

  /** Return the number of columns. */
  public int columnCount() {
    return numColumns;
  }

  /** Return the number of columns. */
  public String[] columnWidths() {
    // Return a width array with exactly the right number of columns
    String rWidth[] = new String[numColumns];
    for (int count = 0; count < numColumns; count++) {
      rWidth[count] = width[count];
    }
    return rWidth;
  }

  /** Discarded. */
  public void characters(char[] chars, int start, int len)
    throws TransformerException {
    // nop
  }

  /** Discarded. */
  public void comment(char[] chars, int start, int length)
    throws TransformerException {
    // nop
  }

  /** Discarded. */
  public void endDocument()
    throws TransformerException {
    // nop
  }

  /** Discarded. */
  public void endElement(int nameCode)
    throws TransformerException {
    // nop
  }

  /** Discarded. */
  public void processingInstruction(java.lang.String name,
				    java.lang.String data)
    throws TransformerException {
    // nop
  }

  /** Discarded. */
  public void setDocumentLocator(org.xml.sax.Locator locator) {
    // nop
  }

  /** Discarded. */
  public void setEscaping(boolean escaping)
    throws TransformerException {
    // nop
  }

  /** Discarded. */
  public void setNamePool(NamePool namePool) {
    // nop
  }

  /** Discarded. */
  public void setUnparsedEntity(java.lang.String name, java.lang.String uri)
    throws TransformerException {
    // nop
  }

  /** Discarded. */
  public void setWriter(java.io.Writer writer) {
    // nop
  }

  /** Discarded. */
  public void startDocument()
    throws TransformerException {
    // nop
  }

  /** 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 == foColFingerprint || thisFingerprint == XHTMLcolFingerprint) {
      if (numColumns >= width.length) {
	String newWidth[] = new String[width.length+10];
	for (int count = 0; count < width.length; count++) {
	  newWidth[count] = width[count];
	}
	width = newWidth;
      }

      if (thisFingerprint == colFingerprint || thisFingerprint == XHTMLcolFingerprint) {
	if (attributes.getValue("width") == null) {
	  width[numColumns++] = "1*";
	} else {
	  width[numColumns++] = attributes.getValue("width");
	}
      } else {
	if (attributes.getValue("column-width") == null) {
	  width[numColumns++] = "1*";
	} else {
	  width[numColumns++] = attributes.getValue("column-width");
	}
      }
    }
  }
}