package com.nwalsh.saxon; import org.xml.sax.*; import com.icl.saxon.output.*; import com.icl.saxon.Controller; import com.icl.saxon.om.*; import javax.xml.transform.TransformerException; import com.icl.saxon.expr.FragmentValue; import com.icl.saxon.tree.AttributeCollection; /** * <p>Saxon extension to scan the column widthsin a result tree fragment.</p> * * <p>$Id: ColumnUpdateEmitter.java,v 1.1 2001/07/16 21:23:57 nwalsh Exp $</p> * * <p>Copyright (C) 2000 Norman Walsh.</p> * * <p>This class provides a * <a href="http://users.iclway.co.uk/mhkay/saxon/">Saxon 6.*</a> * implementation to scan the column widths in a result tree * fragment.</p> * * <p>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.</p> * * <p><b>Change Log:</b></p> * <dl> * <dt>1.0</dt> * <dd><p>Initial release.</p></dd> * </dl> * * @author Norman Walsh * <a href="mailto:ndw@nwalsh.com">ndw@nwalsh.com</a> * * @version $Id: ColumnUpdateEmitter.java,v 1.1 2001/07/16 21:23:57 nwalsh Exp $ * */ 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"; /** 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 foColFingerprint = namePool.getFingerprint(foURI, "table-column"); if (thisFingerprint == colFingerprint) { 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); } }