LightPIT: src/main/java/de/uapcore/lightpit/modules/LanguageModule.java@009700915269

     1 /*

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

     3  *

     4  * Copyright 2021 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.AbstractServlet;

    32 import de.uapcore.lightpit.Constants;

    33 import de.uapcore.lightpit.HttpMethod;

    34 import de.uapcore.lightpit.RequestMapping;

    35 import de.uapcore.lightpit.viewmodel.LanguageView;

    36 import org.slf4j.Logger;

    37 import org.slf4j.LoggerFactory;

    39 import javax.servlet.ServletException;

    40 import javax.servlet.annotation.WebServlet;

    41 import javax.servlet.http.HttpServletRequest;

    42 import javax.servlet.http.HttpServletResponse;

    43 import java.io.IOException;

    44 import java.util.*;

    46 @WebServlet(

    47         name = "LanguageModule",

    48         urlPatterns = "/language/*"

    49 )

    50 public final class LanguageModule extends AbstractServlet {

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

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

    56     @Override

    57     public void init() throws ServletException {

    58         super.init();

    60         Optional<String[]> langs = availableLanguages();

    61         if (langs.isPresent()) {

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

    63                 try {

    64                     Locale locale = Locale.forLanguageTag(lang);

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

    66                         throw new IllformedLocaleException();

    67                     }

    68                     languages.add(locale);

    69                 } catch (IllformedLocaleException ex) {

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

    71                 }

    72             }

    74         } else {

    75             languages.add(Locale.ENGLISH);

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

    77         }

    78     }

    80     @Override

    81     public void destroy() {

    82         super.destroy();

    83         languages.clear();

    84     }

    86     @RequestMapping(method = HttpMethod.GET)

    87     public void handle(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

    89         final var viewModel = new LanguageView();

    90         viewModel.setLanguages(languages);

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

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

    94         setViewModel(req, viewModel);

    95         setStylesheet(req, "language");

    96         setContentPage(req, "language");

    98         renderSite(req, resp);

    99     }

   101     @RequestMapping(method = HttpMethod.POST)

   102     public void switchLanguage(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

   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         handle(req, resp);

   112     }

   113 }

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