Java tutorial
/** * This file Copyright (c) 2003-2012 Magnolia International * Ltd. (http://www.magnolia-cms.com). All rights reserved. * * * This file is dual-licensed under both the Magnolia * Network Agreement and the GNU General Public License. * You may elect to use one or the other of these licenses. * * This file is distributed in the hope that it will be * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT. * Redistribution, except as permitted by whichever of the GPL * or MNA you select, is prohibited. * * 1. For the GPL license (GPL), you can redistribute and/or * modify this file under the terms of the GNU General * Public License, Version 3, as published by the Free Software * Foundation. You should have received a copy of the GNU * General Public License, Version 3 along with this program; * if not, write to the Free Software Foundation, Inc., 51 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * 2. For the Magnolia Network Agreement (MNA), this file * and the accompanying materials are made available under the * terms of the MNA which accompanies this distribution, and * is available at http://www.magnolia-cms.com/mna.html * * Any modifications to this file must keep this entire header * intact. * */ package info.magnolia.freemarker; import info.magnolia.cms.util.AlertUtil; import java.io.PrintWriter; import java.io.StringWriter; import java.io.Writer; import java.util.HashMap; import java.util.Map; import org.apache.commons.lang.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * A bunch of utility methods to render freemarker templates into Strings. * * @author Philipp Bracher * @author gjoseph * @version $Revision: $ ($Author: $) * @see info.magnolia.freemarker.FreemarkerHelper */ public class FreemarkerUtil { private static final Logger log = LoggerFactory.getLogger(FreemarkerUtil.class); /** * Uses the class of the object to create the templates name, passes the object under the name 'this' * and returns the result in a String. * Used only in DialogMultiSelect - VersionCommentPopup - Inbox - SubPagesControl */ public static String process(Object thisObj) { final Writer writer = new StringWriter(); process(thisObj, writer); return writer.toString(); } /** * @see #process(Object) */ public static void process(Object thisObj, Writer out) { process(thisObj.getClass(), thisObj, out); } /** * Same as {@link #process(Object)} but adds the classifier and the extension to the template name. */ public static String process(Object thisObj, String classifier, String ext) { final Writer writer = new StringWriter(); process(thisObj, classifier, ext, writer); return writer.toString(); } /** * @see #process(Object, String, String) */ public static void process(Object thisObj, String classifier, String ext, Writer out) { final Map<String, Object> data = new HashMap<String, Object>(); data.put("this", thisObj); String template = createTemplateName(thisObj.getClass(), classifier, ext); process(template, data, out); } /** * Uses the class to create the templates name and passes the object under the name 'this'. * Uses "html" as template filename extension. * Only used in AbstractSimpleSearchList and VersionsList. */ public static String process(Class<?> klass, Object thisObj) { final Writer writer = new StringWriter(); process(klass, thisObj, writer); return writer.toString(); } /** * @see #process(Class, Object) */ public static void process(Class<?> klass, Object thisObj, Writer out) { final Map<String, Object> data = new HashMap<String, Object>(); data.put("this", thisObj); String template = createTemplateName(klass, "html"); process(template, data, out); } /** * Process this template with the passed data and returns the result in a String. */ public static String process(String name, Map<String, Object> data) { final Writer writer = new StringWriter(); process(name, data, writer); return writer.toString(); } /** * Process the template with the data and writes the result to the writer. * TODO : move this to FreemarkerHelper */ public static void process(String name, Map<String, Object> data, Writer writer) { try { // add some useful default data if (AlertUtil.isMessageSet()) { data.put("message", AlertUtil.getMessage()); } FreemarkerHelper.getInstance().render(name, data, writer); } catch (Exception e) { e.printStackTrace(new PrintWriter(writer)); log.error("Exception while processing template " + name, e); } } /** * Creates a template name based on the class name and adds the extension. * If the class is org.mydomain.TheClass the returned name is /org/mydomain/TheClass.html. */ public static String createTemplateName(Class<?> klass, String ext) { return createTemplateName(klass, null, ext); } /** * Same as {@link #createTemplateName(Class, String)} but adds the classifier between * the template name and the extension. */ public static String createTemplateName(Class<?> klass, String classifier, String ext) { classifier = (classifier != null) ? StringUtils.capitalize(classifier) : ""; return "/" + StringUtils.replace(klass.getName(), ".", "/") + classifier + "." + ext; } }