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/*******************************************************************************
* Copyright (c) 2000, 2011 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.base.BaseHelpSystem;
import org.eclipse.help.internal.dynamic.DocumentWriter;
import org.eclipse.help.internal.index.Index;
import org.eclipse.help.internal.index.IndexContribution;
import org.eclipse.help.internal.webapp.data.UrlUtil;
/*
* Sends all available keyword index data in XML form. The data is sent as one
* large index contribution that includes all merged contributions from the
* system.
*
* This is called on infocenters by client workbenches configured for remote
* help in order to gather all the index keywords and assemble them into a
* complete index.
*/
public class IndexServlet 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 {
BaseHelpSystem.checkMode();
String locale = UrlUtil.getLocale(req, resp);
req.setCharacterEncoding("UTF-8"); //$NON-NLS-1$
if (responseByLocale == null) {
responseByLocale = new WeakHashMap<String, String>();
}
String response = responseByLocale.get(locale);
if (response == null) {
IndexContribution[] contributions = HelpPlugin.getIndexManager().getIndexContributions(locale);
try {
response = serialize(contributions, locale);
}
catch (TransformerException e) {
throw new ServletException(e);
}
responseByLocale.put(locale, response);
}
return (response != null) ? response : ""; //$NON-NLS-1$
}
public String serialize(IndexContribution[] contributions, String locale) throws TransformerException {
StringBuffer buf = new StringBuffer();
buf.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"); //$NON-NLS-1$
buf.append("<indexContributions>\n"); //$NON-NLS-1$
if (writer == null) {
writer = new DocumentWriter();
}
for (IndexContribution contrib : contributions) {
buf.append("<indexContribution\n"); //$NON-NLS-1$
buf.append(" id=\"" + contrib.getId() + '"'); //$NON-NLS-1$
buf.append(" locale=\"" + contrib.getLocale() + "\">\n"); //$NON-NLS-1$ //$NON-NLS-2$
buf.append(writer.writeString((Index)contrib.getIndex(), false));
buf.append("</indexContribution>\n"); //$NON-NLS-1$
}
buf.append("</indexContributions>\n"); //$NON-NLS-1$
return buf.toString();
}
}
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