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/*******************************************************************************
* Copyright (c) 2007, 2017 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* 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();
}
}
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