/* Transformer.java {{IS_NOTE Purpose: Description: History: Tue Aug 28 13:57:53 2007, Created by tomyeh }}IS_NOTE Copyright (C) 2007 Potix Corporation. All Rights Reserved. {{IS_RIGHT This program is distributed under GPL Version 2.0 in the hope that it will be useful, but WITHOUT ANY WARRANTY. }}IS_RIGHT */ package org.zkoss.zml; import java.util.Iterator; import java.io.File; import java.io.InputStream; import java.io.Reader; import java.io.Writer; import java.io.StringReader; import java.io.StringWriter; import java.io.IOException; import java.net.URL; import javax.xml.transform.Source; import javax.xml.transform.Result; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamSource; import javax.xml.transform.stream.StreamResult; import org.zkoss.idom.Document; import org.zkoss.zk.ui.WebApp; import org.zkoss.zk.ui.Component; import org.zkoss.zk.ui.AbstractComponent; import org.zkoss.zk.ui.UiException; /** * XML transformer. * * @author tomyeh */ public class Transformer extends AbstractComponent { private Object _xsl; /** Returns the XSL (Extensible Stylesheet Language), or null * if not available. * * @see #setXsl(String) * @see #setXsl(URL) * @see #setXsl(File) * @see #setXsl(Source) */ public Object getXsl() { return _xsl; } /** Sets the XSL with the resource path. * The resource must be retrievable by use of {@link WebApp#getResource}. */ public void setXsl(String xsl) { _xsl = xsl; } /** Sets the XSL with a file. */ public void setXsl(File xsl) { _xsl = xsl; } /** Sets the XSL with an URL. */ public void setXsl(URL xsl) { _xsl = xsl; } /** Sets the XSL with an input stream. */ public void setXsl(InputStream xsl) { _xsl = xsl; } /** Sets the XSL with a reader. */ public void setXsl(Reader xsl) { _xsl = xsl; } /** Sets the XSL with a XML source. */ public void setXsl(Source xsl) { _xsl = xsl; } /** Sets the XSL with a document. */ public void setXsl(org.w3c.dom.Document xsl) { _xsl = xsl; } /** Sets the XSL with a iDOM document. */ public void setXsl(Document xsl) { _xsl = xsl; } //Component// public void redraw(Writer out) throws IOException { final Source src; { final StringWriter sw = new StringWriter(1024); for (Iterator it = getChildren().iterator(); it.hasNext();) ((Component)it.next()).redraw(sw); src = new StreamSource(new StringReader(sw.toString())); } final Source xsl; if (_xsl instanceof String) { InputStream is = getDesktop().getWebApp().getResourceAsStream( getDesktop().getExecution().toAbsoluteURI((String)_xsl, false)); if (is == null) throw new UiException("Resouce not found, "+_xsl); xsl = new StreamSource(is); } else if (_xsl instanceof File) { xsl = new StreamSource((File)_xsl); } else if (_xsl instanceof InputStream) { xsl = new StreamSource((InputStream)_xsl); } else if (_xsl instanceof Reader) { xsl = new StreamSource((Reader)_xsl); } else if (_xsl instanceof URL) { xsl = new StreamSource(((URL)_xsl).openStream()); } else if (_xsl instanceof org.w3c.dom.Document) { //include iDOM xsl = new DOMSource((org.w3c.dom.Document)_xsl); } else if (_xsl == null) { xsl = null; } else { throw new InternalError("Unknown XSL: "+_xsl.getClass().getName()); } final StringWriter result = new StringWriter(); try { new org.zkoss.idom.transform.Transformer(xsl) .transform(src, new StreamResult(result)); } catch (Throwable ex) { throw UiException.Aide.wrap(ex); } //We have to stripe since UiEngine generates spaces //before this component final StringBuffer sb = result.getBuffer(); int j = 0; l_out: for (int len = sb.length(); j < len; j++) { char cc = sb.charAt(j); if (isSpace(cc)) continue; if (cc == ' int k = j; if (isChar(sb, ++k, '?') && isChar(sb, ++k, 'x') && isChar(sb, ++k, 'm') && isChar(sb, ++k, 'l') && ++k < len && isSpace(sb.charAt(k))) { while (++k < len) { cc = sb.charAt(k); if (cc == '>') { j = k + 1; break l_out; //done } } } } break; } out.write(sb.substring(j)); } private static boolean isSpace(char cc) { return cc == ' ' || cc == '\t' || cc == '\n' || cc == '\r'; } private static boolean isChar(StringBuffer sb, int j, char cc) { return j < sb.length() && sb.charAt(j) == cc; } }
