| /******************************************************************************* |
| * Copyright (c) 2007, 2017 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.help.internal.webapp.servlet; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| import java.util.WeakHashMap; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import javax.xml.transform.TransformerException; |
| |
| import org.eclipse.help.internal.HelpPlugin; |
| import org.eclipse.help.internal.dynamic.DocumentWriter; |
| import org.eclipse.help.internal.extension.ContentExtension; |
| import org.eclipse.help.internal.webapp.data.UrlUtil; |
| |
| /* |
| * Sends all topic extensions available on this host in XML form. |
| * |
| * This is called on infocenters by client workbenches configured for remote |
| * help in order to gather all the pieces of a document. |
| */ |
| public class ExtensionServlet extends HttpServlet { |
| |
| private static final long serialVersionUID = 1L; |
| private Map<String, String> responseByLocale; |
| private DocumentWriter writer; |
| |
| @Override |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) |
| throws ServletException, IOException { |
| // set the character-set to UTF-8 before calling resp.getWriter() |
| resp.setContentType("application/xml; charset=UTF-8"); //$NON-NLS-1$ |
| resp.getWriter().write(processRequest(req, resp)); |
| } |
| |
| protected String processRequest(HttpServletRequest req, HttpServletResponse resp) |
| throws ServletException, IOException { |
| String locale = UrlUtil.getLocale(req, resp); |
| req.setCharacterEncoding("UTF-8"); //$NON-NLS-1$ |
| |
| if (responseByLocale == null) { |
| responseByLocale = new WeakHashMap<>(); |
| } |
| String response = responseByLocale.get(locale); |
| if (response == null) { |
| ContentExtension[] extensions = HelpPlugin.getContentExtensionManager().getExtensions(locale); |
| try { |
| response = serialize(extensions); |
| } |
| catch (TransformerException e) { |
| throw new ServletException(e); |
| } |
| responseByLocale.put(locale, response); |
| } |
| return response; |
| } |
| |
| private String serialize(ContentExtension[] extensions) throws TransformerException { |
| StringBuilder buf = new StringBuilder(); |
| buf.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"); //$NON-NLS-1$ |
| buf.append("<contentExtensions>\n"); //$NON-NLS-1$ |
| for (ContentExtension extension : extensions) { |
| if (writer == null) { |
| writer = new DocumentWriter(); |
| } |
| buf.append(writer.writeString(extension, false)); |
| } |
| buf.append("</contentExtensions>\n"); //$NON-NLS-1$ |
| return buf.toString(); |
| } |
| } |