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The JSP tags for encapsulating ZK XUL components

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/* PageRenderer.java

	Purpose:
		
	Description:
		
	History:
		Wed Oct  7 17:08:21     2009, Created by tomyeh

Copyright (C) 2009 Potix Corporation. All Rights Reserved.

This program is distributed under GPL Version 3.0 in the hope that
it will be useful, but WITHOUT ANY WARRANTY.
*/
package org.zkoss.jsp.zul.impl;

import java.util.Iterator;
import java.io.Writer;
import java.io.IOException;

import org.zkoss.xml.XMLs;

import org.zkoss.zk.ui.Executions;
import org.zkoss.zk.ui.Execution;
import org.zkoss.zk.ui.Desktop;
import org.zkoss.zk.ui.Page;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.sys.ComponentCtrl;
import org.zkoss.zk.ui.sys.HtmlPageRenders;
import org.zkoss.zk.ui.WebApp;
import org.zkoss.util.Utils;
import org.zkoss.zk.ui.sys.SEORenderer;


/**
 * The page renderer used for rendering this page.
 * @author tomyeh
 * @since 1.4.0
 */
public class PageRenderer implements org.zkoss.zk.ui.sys.PageRenderer {
	public void render(Page page, Writer out) throws IOException {
		final Execution exec = Executions.getCurrent();
		final Desktop desktop = exec.getDesktop();

		out.write(HtmlPageRenders.outHeaders(exec, page, true));
		out.write(HtmlPageRenders.outLangStyleSheets(exec, null, null));
		out.write(HtmlPageRenders.outLangJavaScripts(exec, null, null));
		out.write(HtmlPageRenders.outHeaders(exec, page, false));

		out.write("\n");

		for (Iterator it = page.getRoots().iterator(); it.hasNext();) {
			final Component comp = (Component)it.next();
			if (!(comp instanceof Inline)) {
				out.write("");
				if (page != null) {
					final WebApp wapp = page.getDesktop().getWebApp();
					String currentVersion = wapp.getVersion();
					if (Utils.compareVersion(Utils.parseVersion(currentVersion),
							Utils.parseVersion("5.0.7")) > -1) {
						SEORenderer[] seos = wapp
							.getConfiguration().getSEORenderers();
						for (int i = 0;i < seos.length;i ++) {
							(seos[i]).render(page, out);
						}
					}
				}
				out.write("

\n");
			}
		}

		out.write(HtmlPageRenders.outResponseJavaScripts(exec));
	}
	private static String getContextURI(Execution exec) {
		if (exec != null) {
			String s = exec.encodeURL("/");
			int j = s.lastIndexOf('/'); //might have jsessionid=...
			return j >= 0 ? s.substring(0, j) + s.substring(j + 1): s;
		}
		return "";
	}
	private static final void writeAttr(Writer out, String name, String value)
	throws IOException {
		out.write(' ');
		out.write(name);
		out.write("=\"");
		out.write(XMLs.encodeAttribute(value));
		out.write('"');
	}
}