LightPIT: src/main/java/de/uapcore/lightpit/modules/LanguageModule.java@bb4c52bf3439

     1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

     3  *

     4  * Copyright 2018 Mike Becker. All rights reserved.

     5  *

     6  * Redistribution and use in source and binary forms, with or without

     7  * modification, are permitted provided that the following conditions are met:

     8  *

     9  *   1. Redistributions of source code must retain the above copyright

    10  *      notice, this list of conditions and the following disclaimer.

    11  *

    12  *   2. Redistributions in binary form must reproduce the above copyright

    13  *      notice, this list of conditions and the following disclaimer in the

    14  *      documentation and/or other materials provided with the distribution.

    15  *

    16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

    20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    26  * POSSIBILITY OF SUCH DAMAGE.

    27  *

    28  */

    29 package de.uapcore.lightpit.modules;

    31 import de.uapcore.lightpit.*;

    32 import org.slf4j.Logger;

    33 import org.slf4j.LoggerFactory;

    35 import javax.servlet.ServletException;

    36 import javax.servlet.annotation.WebServlet;

    37 import javax.servlet.http.HttpServletRequest;

    38 import javax.servlet.http.HttpServletResponse;

    39 import java.util.*;

    42 @LightPITModule(

    43         bundleBaseName = "localization.language",

    44         modulePath = "language",

    45         defaultPriority = 20000

    46 )

    47 @WebServlet(

    48         name = "LanguageModule",

    49         urlPatterns = "/language/*"

    50 )

    51 public final class LanguageModule extends AbstractLightPITServlet {

    53     private static final Logger LOG = LoggerFactory.getLogger(LanguageModule.class);

    55     private final List<Locale> languages = new ArrayList<>();

    57     @Override

    58     protected String getResourceBundleName() {

    59         return "localization.language";

    60     }

    62     @Override

    63     public void init() throws ServletException {

    64         super.init();

    66         Optional<String[]> langs = Functions.availableLanguages(getServletContext());

    67         if (langs.isPresent()) {

    68             for (String lang : langs.get()) {

    69                 try {

    70                     Locale locale = Locale.forLanguageTag(lang);

    71                     if (locale.getLanguage().isEmpty()) {

    72                         throw new IllformedLocaleException();

    73                     }

    74                     languages.add(locale);

    75                 } catch (IllformedLocaleException ex) {

    76                     LOG.warn("Specified language {} in context parameter cannot be mapped to an existing locale - skipping.", lang);

    77                 }

    78             }

    80         } else {

    81             languages.add(Locale.ENGLISH);

    82             LOG.warn("Context parameter 'available-languages' not found. Only english will be available.");

    83         }

    84     }

    86     @Override

    87     public void destroy() {

    88         super.destroy();

    89         languages.clear();

    90     }

    92     @RequestMapping(method = HttpMethod.GET)

    93     public ResponseType handle(HttpServletRequest req) {

    95         req.setAttribute("languages", languages);

    96         req.setAttribute("browserLanguage", req.getLocale());

    98         setStylesheet(req, "language");

    99         setContentPage(req, "language");

   100         return ResponseType.HTML;

   101     }

   103     @RequestMapping(method = HttpMethod.POST)

   104     public ResponseType switchLanguage(HttpServletRequest req, HttpServletResponse resp) {

   106         Optional<Locale> chosenLanguage = Optional.ofNullable(req.getParameter("language"))

   107                 .map(Locale::forLanguageTag)

   108                 .filter((l) -> !l.getLanguage().isEmpty());

   110         chosenLanguage.ifPresent((l) -> req.getSession().setAttribute(Constants.SESSION_ATTR_LANGUAGE, l));

   111         chosenLanguage.ifPresent(resp::setLocale);

   113         return handle(req);

   114     }

   115 }

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