src/java/de/uapcore/lightpit/modules/LanguageModule.java

Sat, 31 Mar 2018 19:35:04 +0200

author
Mike Becker <universe@uap-core.de>
date
Sat, 31 Mar 2018 19:35:04 +0200
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module synchronization with database

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2017 Mike Becker. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 *
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28 */
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29 package de.uapcore.lightpit.modules;
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30
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31 import de.uapcore.lightpit.LightPITModule;
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32 import de.uapcore.lightpit.AbstractLightPITServlet;
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33 import de.uapcore.lightpit.Constants;
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34 import de.uapcore.lightpit.Functions;
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35 import de.uapcore.lightpit.HttpMethod;
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36 import javax.servlet.annotation.WebServlet;
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37 import javax.servlet.http.HttpServletRequest;
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38 import javax.servlet.http.HttpServletResponse;
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39 import de.uapcore.lightpit.RequestMapping;
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40 import de.uapcore.lightpit.ResponseType;
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41 import java.util.ArrayList;
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42 import java.util.IllformedLocaleException;
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43 import java.util.List;
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44 import java.util.Locale;
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45 import java.util.Optional;
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46 import javax.servlet.ServletException;
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47 import org.slf4j.Logger;
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48 import org.slf4j.LoggerFactory;
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49
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50
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51 @LightPITModule(
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52 bundleBaseName = "de.uapcore.lightpit.resources.localization.language",
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53 modulePath = "language"
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54 )
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55 @WebServlet(
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56 name = "LanguageModule",
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57 urlPatterns = "/language/*"
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58 )
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59 public final class LanguageModule extends AbstractLightPITServlet {
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60
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61 private static final Logger LOG = LoggerFactory.getLogger(LanguageModule.class);
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62
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63 private final List<Locale> languages = new ArrayList<>();
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64
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65 @Override
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66 public void init() throws ServletException {
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67 super.init();
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68
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69 Optional<String[]> langs = Functions.availableLanguages(getServletContext());
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70 if (langs.isPresent()) {
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71 for (String lang : langs.get()) {
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72 try {
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73 Locale locale = Locale.forLanguageTag(lang);
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74 if (locale.getLanguage().isEmpty()) {
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75 throw new IllformedLocaleException();
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76 }
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77 languages.add(locale);
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78 } catch (IllformedLocaleException ex) {
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79 LOG.warn("Specified lanaguge {} in context parameter cannot be mapped to an existing locale - skipping.", lang);
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80 }
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81 }
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82
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83 } else {
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84 languages.add(Locale.ENGLISH);
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85 LOG.warn("Context parameter 'available-languges' not found. Only english will be available.");
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86 }
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87 }
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89 @Override
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90 public void destroy() {
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91 super.destroy();
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92 languages.clear();
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93 }
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94
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95 @RequestMapping(method = HttpMethod.GET)
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96 public ResponseType handle(HttpServletRequest req, HttpServletResponse resp) {
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97
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98 req.setAttribute("languages", languages);
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99 req.setAttribute("browserLanguage", req.getLocale());
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100
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101 setStylesheet(req, "language");
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102 setDynamicFragment(req, "language");
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103 return ResponseType.HTML_FULL;
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104 }
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105
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106 @RequestMapping(method = HttpMethod.POST)
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107 public ResponseType switchLanguage(HttpServletRequest req, HttpServletResponse resp) {
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108
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109 Optional<Locale> chosenLanguage = Optional.ofNullable(req.getParameter("language"))
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110 .map(Locale::forLanguageTag)
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111 .filter((l) -> !l.getLanguage().isEmpty());
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112
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113 chosenLanguage.ifPresent((l) -> req.getSession().setAttribute(Constants.SESSION_ATTR_LANGUAGE, l));
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114 chosenLanguage.ifPresent(resp::setLocale);
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115
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116 return handle(req, resp);
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117 }
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118 }

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