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/*******************************************************************************
* Copyright (c) 2000, 2006 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 org.eclipse.help.internal.HelpPlugin;
import org.eclipse.help.internal.context.Context;
import org.eclipse.help.internal.dynamic.NodeWriter;
import org.eclipse.help.internal.webapp.data.UrlUtil;
/*
* Returns a context help entry with the id specified in the id parameter.
*
* This is called on infocenters by client workbenches configured for remote
* help in order to retrieve context help stored on the remote help server.
*/
public class ContextServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final String PARAMETER_ID = "id"; //$NON-NLS-1$
private Map responseByLocaleAndId;
private NodeWriter writer;
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String locale = UrlUtil.getLocale(req, resp);
req.setCharacterEncoding("UTF-8"); //$NON-NLS-1$
resp.setContentType("application/xml; charset=UTF-8"); //$NON-NLS-1$
String id = req.getParameter(PARAMETER_ID);
if (id != null) {
String localeAndId = locale + id;
if (responseByLocaleAndId == null) {
responseByLocaleAndId = new WeakHashMap();
}
String response = (String)responseByLocaleAndId.get(localeAndId);
if (response == null) {
Context context = HelpPlugin.getContextManager().getContext(id, locale);
if (context != null) {
response = serialize(context, id);
responseByLocaleAndId.put(localeAndId, response);
}
}
if (response != null) {
resp.getWriter().write(response);
}
else {
resp.sendError(404);
}
}
else {
resp.sendError(400); // bad request; missing parameter
}
}
private String serialize(Context context, String id) {
StringBuffer buf = new StringBuffer();
buf.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"); //$NON-NLS-1$
if (writer == null) {
writer = new NodeWriter();
}
writer.write(context, buf, true, " ", true); //$NON-NLS-1$
return buf.toString();
}
}
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