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/*******************************************************************************
* Copyright (c) 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.service;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.help.internal.webapp.parser.IndexFragmentParser;
import org.eclipse.help.internal.webapp.servlet.IndexFragmentServlet;
import org.eclipse.help.internal.webapp.utils.Utils;
/**
* Returns <code>xml</code> or <code>json</code> representing selected parts
* of the index.
*
* <p>This servlet is called on infocenters by client workbenches
* configured for remote help in order to gather selected parts of the index.
*
* <p>Extends the {@link org.eclipse.help.internal.webapp.servlet.IndexFragmentServlet}
* servlet.
*
* @param start - (optional) represents the part of the index to
* start reading from
* @param size - (optional) indicates the number of entries to read,
* no size parameter or a negative size parameter
* indicates that all entries which match the start
* letters should be displayed
* @param mode - (optional) specifies either <code>next</code> or
* <code>previous</code>
* @param entry - (optional) represents the starting point relative
* to the start
* @param showAll - (optional) specifies either <code>on</code> or
* <code>off</code> to set filter enablement of
* activity support
* @param showconfirm - (optional) specifies <code>true</code> or
* <code>false</code> to show/hide all confirm dialog
* @param lang - (optional) specifies the locale
* @param returnType - (Optional) specifies the return type of the servlet.
* Accepts either <code>xml</code> (default) or
* <code>json</code>
*
* @return Selected parts of the index, either as <code>xml</code>
* (default) or <code>json</code>
*
* @version $Version$
*
**/
public class IndexFragmentService extends IndexFragmentServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
req.setCharacterEncoding("UTF-8"); //$NON-NLS-1$
// Set standard HTTP/1.1 no-cache headers.
resp.setHeader("Cache-Control", //$NON-NLS-1$
"no-store, no-cache, must-revalidate"); //$NON-NLS-1$
resp.setContentType("application/xml; charset=UTF-8"); //$NON-NLS-1$
String response = processRequest(req, resp);
String returnType = req.getParameter(Utils.RETURN_TYPE);
boolean boolIsJSON = (returnType != null
&& returnType.equalsIgnoreCase(Utils.JSON));
// If JSON output is required
if (boolIsJSON) {
resp.setContentType("text/plain"); //$NON-NLS-1$
response = getJSONResponse(response);
}
resp.getWriter().write(response);
}
protected String getJSONResponse(String response)
throws IOException {
IndexFragmentParser indexParser = new IndexFragmentParser();
InputStream is = null;
try {
if (response != null) {
is = new ByteArrayInputStream(response.getBytes("UTF-8")); //$NON-NLS-1$
indexParser.parse(is);
}
} catch (Exception e) {
e.printStackTrace();
}
if (is != null)
is.close();
// Call after the catch.
// An empty JSON is created if any Exception is thrown
// Else returns the complete JSON
return indexParser.toJSON();
}
}
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