/* Transformer.java{{IS_NOTE	Purpose:			Description:			History:		Tue Aug 28 13:57:53     2007, Created by tomyeh}}IS_NOTECopyright (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 <?xml...?> 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;	}}