fll.web.ajax.DisplayQueryServlet.java Source code

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Here is the source code for fll.web.ajax.DisplayQueryServlet.java

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/*
 * Copyright (c) 2012 INSciTE.  All rights reserved
 * INSciTE is on the web at: http://www.hightechkids.org
 * This code is released under GPL; see LICENSE.txt for details.
 */

package fll.web.ajax;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import fll.Utilities;
import fll.util.FLLInternalException;
import fll.web.ApplicationAttributes;
import fll.web.BaseFLLServlet;
import fll.web.DisplayNames;
import fll.web.SessionAttributes;

/**
 * Send big screen display data via JavaScript, to avoid network-timeout induced
 * freezes
 */
@WebServlet("/ajax/DisplayQuery")
public class DisplayQueryServlet extends BaseFLLServlet {
    protected void processRequest(final HttpServletRequest request, final HttpServletResponse response,
            final ServletContext application, final HttpSession session) throws IOException, ServletException {
        final String localDisplayPage;
        final String localDisplayURL;
        final String displayName = SessionAttributes.getAttribute(session, "displayName", String.class);
        if (displayName != null) {
            // update last seen time
            DisplayNames.appendDisplayName(application, session, displayName);

            final String myDisplayPage = ApplicationAttributes.getAttribute(application,
                    displayName + "_displayPage", String.class);
            final String myDisplayURL = ApplicationAttributes.getAttribute(application, displayName + "_displayURL",
                    String.class);

            localDisplayPage = myDisplayPage != null ? myDisplayPage
                    : ApplicationAttributes.getAttribute(application, ApplicationAttributes.DISPLAY_PAGE,
                            String.class);

            localDisplayURL = myDisplayURL != null ? myDisplayURL
                    : ApplicationAttributes.getAttribute(application, "displayURL", String.class);
        } else {
            localDisplayPage = ApplicationAttributes.getAttribute(application, ApplicationAttributes.DISPLAY_PAGE,
                    String.class);
            localDisplayURL = ApplicationAttributes.getAttribute(application, "displayURL", String.class);
        }

        final String url = pickURL(request, localDisplayPage, localDisplayURL, application, session);
        final DisplayResponse displayResponse = new DisplayResponse(url);

        final ObjectMapper jsonMapper = new ObjectMapper();

        response.reset();
        response.setContentType("application/json");
        final PrintWriter writer = response.getWriter();

        jsonMapper.writeValue(writer, displayResponse);
    }

    /**
     * Convert displayPage variable into URL. The names here need to match the
     * values
     * of the "remotePage" radio buttons in remoteControl.jsp.
     */
    private String pickURL(final HttpServletRequest request, final String displayPage, final String displayURL,
            final ServletContext application, final HttpSession session) {
        final String contextPath = request.getContextPath();

        if (null == displayPage) {
            return contextPath + "/welcome.jsp";
        } else if ("scoreboard".equals(displayPage)) {
            return contextPath + "/scoreboard/main.jsp";
        } else if ("slideshow".equals(displayPage)) {
            return contextPath + "/slideshow/index.jsp";
        } else if ("playoffs".equals(displayPage)) {
            return contextPath + "/playoff/remoteMain.jsp";
        } else if ("finalistSchedule".equals(displayPage)) {
            try {
                String finalistScheduleDivision = null;

                final String displayName = SessionAttributes.getAttribute(session, "displayName", String.class);
                if (null != displayName) {
                    finalistScheduleDivision = ApplicationAttributes.getAttribute(application,
                            displayName + "_finalistScheduleDivision", String.class);
                }

                if (null == finalistScheduleDivision) {
                    finalistScheduleDivision = ApplicationAttributes.getAttribute(application, "finalistDivision",
                            String.class);
                }

                return String.format(
                        "%s/report/finalist/PublicFinalistDisplaySchedule.jsp?finalistScheduleScroll=true&division=%s",
                        contextPath, URLEncoder.encode(finalistScheduleDivision, Utilities.DEFAULT_CHARSET.name()));
            } catch (final UnsupportedEncodingException e) {
                throw new FLLInternalException("Cannot encode using default charset?", e);
            }
        } else if ("special".equals(displayPage)) {
            return contextPath + "/" + displayURL;
        } else {
            return contextPath + "/welcome.jsp";
        }
    }

    /**
     * Response to the query servlet.
     */
    public static class DisplayResponse {
        @SuppressFBWarnings(value = {
                "URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD" }, justification = "Read in the javascript")
        public final String displayURL;

        public String getDisplayURL() {
            return this.displayURL;
        }

        public DisplayResponse(@JsonProperty("displayURL") final String displayURL) {
            this.displayURL = displayURL;
        }
    }
}