Example:
** <?xml version="1.0"?> * <xsl:stylesheet xmlns:xsl="http://www.w3.org/XSL/Transform/1.0" * xmlns:lxslt="http://xml.apache.org/xslt" * xmlns:redirect="org.apache.xalan.lib.Redirect" * extension-element-prefixes="redirect"> * * <xsl:template match="/"> * <out> * default output. * </out> * <redirect:open file="doc3.out"/> * <redirect:write file="doc3.out"> * <out> * <redirect:write file="doc1.out"> * <out> * doc1 output. * <redirect:write file="doc3.out"> * Some text to doc3 * </redirect:write> * </out> * </redirect:write> * <redirect:write file="doc2.out"> * <out> * doc2 output. * <redirect:write file="doc3.out"> * Some more text to doc3 * <redirect:write select="doc/foo"> * text for doc4 * </redirect:write> * </redirect:write> * </out> * </redirect:write> * </out> * </redirect:write> * <redirect:close file="doc3.out"/> * </xsl:template> * * </xsl:stylesheet> ** * @author Scott Boag * @version 1.0 * @see Example with Redirect extension */ public class Redirect { /** * List of formatter listeners indexed by filename. */ protected Hashtable m_formatterListeners = new Hashtable (); /** * List of output streams indexed by filename. */ protected Hashtable m_outputStreams = new Hashtable (); /** * Open the given file and put it in the XML, HTML, or Text formatter listener's table. */ public void open(XSLProcessorContext context, ElemExtensionCall elem) throws java.net.MalformedURLException, java.io.FileNotFoundException, java.io.IOException, javax.xml.transform.TransformerException { String fileName = getFilename(context, elem); Object flistener = m_formatterListeners.get(fileName); if(null == flistener) { String mkdirsExpr = elem.getAttribute ("mkdirs", context.getContextNode(), context.getTransformer()); boolean mkdirs = (mkdirsExpr != null) ? (mkdirsExpr.equals("true") || mkdirsExpr.equals("yes")) : true; /** * Whether to append to existing files or not */ String appendExpr = elem.getAttribute ("append", context.getContextNode(), context.getTransformer()); boolean append= (appendExpr != null) ? (appendExpr.equals("true") || appendExpr.equals("yes")) : true; // ContentHandler fl = makeFormatterListener(context, elem, fileName, true, mkdirs, append); // fl.startDocument(); } } /** * Write the evalutation of the element children to the given file. Then close the file * unless it was opened with the open extension element and is in the formatter listener's table. */ public void write(XSLProcessorContext context, ElemExtensionCall elem) throws java.net.MalformedURLException, java.io.FileNotFoundException, java.io.IOException, javax.xml.transform.TransformerException { String fileName = getFilename(context, elem); Object flObject = m_formatterListeners.get(fileName); ContentHandler formatter; boolean inTable = false; if(null == flObject) { String mkdirsExpr = ((ElemExtensionCall)elem).getAttribute ("mkdirs", context.getContextNode(), context.getTransformer()); boolean mkdirs = (mkdirsExpr != null) ? (mkdirsExpr.equals("true") || mkdirsExpr.equals("yes")) : true; /** * Whether to append to existing files or not */ String appendExpr = elem.getAttribute ("append", context.getContextNode(), context.getTransformer()); boolean append= (appendExpr != null) ? (appendExpr.equals("true") || appendExpr.equals("yes")) : true; formatter = makeFormatterListener(context, elem, fileName, true, mkdirs, append); //formatter = makeFormatterListener(context, elem, fileName, true, mkdirs); } else { inTable = true; formatter = (ContentHandler)flObject; } TransformerImpl transf = context.getTransformer(); transf.executeChildTemplates(elem, context.getContextNode(), context.getMode(), formatter); if(!inTable) { OutputStream ostream = (OutputStream)m_outputStreams.get(fileName); if(null != ostream) { try { formatter.endDocument(); } catch(org.xml.sax.SAXException se) { throw new TransformerException(se); } ostream.close(); m_outputStreams.remove(fileName); m_formatterListeners.remove(fileName); } } } /** * Close the given file and remove it from the formatter listener's table. */ public void close(XSLProcessorContext context, ElemExtensionCall elem) throws java.net.MalformedURLException, java.io.FileNotFoundException, java.io.IOException, javax.xml.transform.TransformerException { String fileName = getFilename(context, elem); Object formatterObj = m_formatterListeners.get(fileName); if(null != formatterObj) { ContentHandler fl = (ContentHandler)formatterObj; try { fl.endDocument(); } catch(org.xml.sax.SAXException se) { throw new TransformerException(se); } OutputStream ostream = (OutputStream)m_outputStreams.get(fileName); if(null != ostream) { ostream.close(); m_outputStreams.remove(fileName); } m_formatterListeners.remove(fileName); } } /** * Get the filename from the 'select' or the 'file' attribute. */ private String getFilename(XSLProcessorContext context, ElemExtensionCall elem) throws java.net.MalformedURLException, java.io.FileNotFoundException, java.io.IOException, javax.xml.transform.TransformerException { String fileName; String fileNameExpr = ((ElemExtensionCall)elem).getAttribute ("select", context.getContextNode(), context.getTransformer()); if(null != fileNameExpr) { org.apache.xpath.XPathContext xctxt = context.getTransformer().getXPathContext(); XPath myxpath = new XPath(fileNameExpr, elem, xctxt.getNamespaceContext(), XPath.SELECT); XObject xobj = myxpath.execute(xctxt, context.getContextNode(), xctxt.getNamespaceContext()); fileName = xobj.str(); if((null == fileName) || (fileName.length() == 0)) { fileName = elem.getAttribute ("file", context.getContextNode(), context.getTransformer()); } } else { fileName = elem.getAttribute ("file", context.getContextNode(), context.getTransformer()); } if(null == fileName) { context.getTransformer().getMsgMgr().error(elem, elem, context.getContextNode(), XSLTErrorResources.ER_REDIRECT_COULDNT_GET_FILENAME); //"Redirect extension: Could not get filename - file or select attribute must return vald string."); } return fileName; } // yuck. private String urlToFileName(String base) { if(null != base) { if(base.startsWith("file:////")) { base = base.substring(7); } else if(base.startsWith("file:///")) { base = base.substring(6); } else if(base.startsWith("file://")) { base = base.substring(5); // absolute? } else if(base.startsWith("file:/")) { base = base.substring(5); } else if(base.startsWith("file:")) { base = base.substring(4); } } return base; } /** * Create a new ContentHandler, based on attributes of the current ContentHandler. */ private ContentHandler makeFormatterListener(XSLProcessorContext context, ElemExtensionCall elem, String fileName, boolean shouldPutInTable, boolean mkdirs, boolean append) throws java.net.MalformedURLException, java.io.FileNotFoundException, java.io.IOException, javax.xml.transform.TransformerException { File file = new File(fileName); TransformerImpl transformer = context.getTransformer(); String base; // Base URI to use for relative paths if(!file.isAbsolute()) { // This code is attributed to Jon Grov