Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/filter/NoCacheFilter.java @ 5861:172338b1407f

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GWT client: Added copyright header.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:30:15 +0200
parents 5aa05a7a34b7
children ea9eef426962
rev   line source
5861
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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821a02bbfb4e Fixed internal java dependencies
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9 package org.dive4elements.river.client.server.filter;
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10
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11 import java.io.IOException;
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12 import java.util.Date;
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13
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14 import javax.servlet.Filter;
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15 import javax.servlet.FilterChain;
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16 import javax.servlet.FilterConfig;
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17 import javax.servlet.ServletException;
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18 import javax.servlet.ServletRequest;
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19 import javax.servlet.ServletResponse;
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20 import javax.servlet.http.HttpServletRequest;
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21 import javax.servlet.http.HttpServletResponse;
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22
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23 import org.apache.log4j.Logger;
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24
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25 /** ServletFilter to avoid caching for GWTs *.nocache.* files. */
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26 public class NoCacheFilter implements Filter {
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27
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28 private static final long DAY = 86400000L;
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29
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30 private static final String NO_CACHE = ".nocache.";
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31
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32 private static Logger log = Logger.getLogger(NoCacheFilter.class);
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33
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34 /**
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35 * Initialize.
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36 */
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37 @Override
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38 public void init(FilterConfig config)
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39 throws ServletException
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40 {
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41 }
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42
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43
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44 /**
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45 * Called when filter in chain invoked.
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46 * @param req request to servlet
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47 * @param resp response of servlet
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48 * @param chain the filter chain
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49 */
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50 @Override
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51 public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
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52 throws IOException, ServletException
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53 {
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54 HttpServletRequest httpreq = (HttpServletRequest)req;
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55 String uri = httpreq.getRequestURI();
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56
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57 if (uri.contains(NO_CACHE)) {
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58 log.debug("Set no-cache for " + uri);
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59
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60 Date now = new Date();
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61 HttpServletResponse httpresp = (HttpServletResponse)resp;
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62 httpresp.setDateHeader("Date", now.getTime());
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63 httpresp.setDateHeader("Expires", now.getTime() - DAY);
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64 httpresp.setHeader("Pragma", "no-cache");
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65 httpresp.setHeader("Cache-control",
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66 "no-cache, no-store, must-revalidate");
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67 }
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68
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69 chain.doFilter(req, resp);
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70 }
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71
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72
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73 /**
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74 * Do nothing at destruction.
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75 */
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76 @Override
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77 public void destroy() {
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78 }
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79 }
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80 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org