LightPIT: src/main/java/de/uapcore/lightpit/modules/LanguageModule.java@0a658e53177c

     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 de.uapcore.lightpit.viewmodel.LanguageView;

    33 import org.slf4j.Logger;

    34 import org.slf4j.LoggerFactory;

    36 import javax.servlet.ServletException;

    37 import javax.servlet.annotation.WebServlet;

    38 import javax.servlet.http.HttpServletRequest;

    39 import javax.servlet.http.HttpServletResponse;

    40 import java.util.*;

    42 @WebServlet(

    43         name = "LanguageModule",

    44         urlPatterns = "/language/*"

    45 )

    46 public final class LanguageModule extends AbstractLightPITServlet {

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

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

    52     @Override

    53     protected String getResourceBundleName() {

    54         return "localization.language";

    55     }

    57     @Override

    58     public void init() throws ServletException {

    59         super.init();

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

    62         if (langs.isPresent()) {

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

    64                 try {

    65                     Locale locale = Locale.forLanguageTag(lang);

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

    67                         throw new IllformedLocaleException();

    68                     }

    69                     languages.add(locale);

    70                 } catch (IllformedLocaleException ex) {

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

    72                 }

    73             }

    75         } else {

    76             languages.add(Locale.ENGLISH);

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

    78         }

    79     }

    81     @Override

    82     public void destroy() {

    83         super.destroy();

    84         languages.clear();

    85     }

    87     @RequestMapping(method = HttpMethod.GET)

    88     public ResponseType handle(HttpServletRequest req) {

    90         final var viewModel = new LanguageView();

    91         viewModel.setLanguages(languages);

    92         viewModel.setBrowserLanguage(req.getLocale());

    93         viewModel.setCurrentLanguage((Locale)req.getSession().getAttribute(Constants.SESSION_ATTR_LANGUAGE));

    95         setViewModel(req, viewModel);

    96         setStylesheet(req, "language");

    97         setContentPage(req, "language");

    98         return ResponseType.HTML;

    99     }

   101     @RequestMapping(method = HttpMethod.POST)

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

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

   105                 .map(Locale::forLanguageTag)

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

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

   109         chosenLanguage.ifPresent(resp::setLocale);

   111         return handle(req);

   112     }

   113 }

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