Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/resources/Resources.java @ 5863:4897a58c8746
River artifacts: Added new copyright headers.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Sun, 28 Apr 2013 14:40:59 +0200 |
parents | 5aa05a7a34b7 |
children | af13ceeba52a |
rev | line source |
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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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9 package org.dive4elements.river.artifacts.resources; |
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10 |
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11 import java.text.MessageFormat; |
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12 import java.util.Locale; |
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13 import java.util.MissingResourceException; |
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14 import java.util.ResourceBundle; |
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15 |
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16 import org.apache.log4j.Logger; |
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17 |
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18 import org.dive4elements.artifacts.CallMeta; |
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19 |
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20 /** |
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21 * This class provides methods for i18n. |
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22 * |
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23 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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24 */ |
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25 public class Resources { |
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26 |
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27 /** The logger that is used in this class.*/ |
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28 private static Logger logger = Logger.getLogger(Resources.class); |
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29 |
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30 /** The singleton instance.*/ |
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31 private static Resources INSTANCE; |
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32 |
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33 /** The locales supported by this server.*/ |
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34 protected Locale[] locales; |
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35 |
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36 /** |
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37 * No instance of this class is necessary. |
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38 */ |
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39 private Resources() { |
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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 * Returns the locales supported by this server. |
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45 * |
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46 * @return the supported locales. |
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47 */ |
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48 public synchronized Locale [] getLocales() { |
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49 if (locales == null) { |
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50 readLocales(); |
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51 } |
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52 |
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53 return locales; |
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54 } |
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55 |
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56 |
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57 /** |
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58 * Read the locales configured for this server. |
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59 */ |
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60 protected void readLocales() { |
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61 // TODO IMPLEMENT ME |
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62 |
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63 locales = new Locale[2]; |
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64 locales[0] = Locale.GERMANY; |
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65 locales[1] = Locale.ENGLISH; |
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66 } |
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67 |
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68 |
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69 private static synchronized void ensureInstance() { |
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70 if (INSTANCE == null) { |
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71 INSTANCE = new Resources(); |
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72 } |
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73 } |
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74 |
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75 |
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76 public static Locale getLocale(CallMeta meta) { |
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77 ensureInstance(); |
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78 |
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79 Locale[] locales = INSTANCE.getLocales(); |
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80 return meta.getPreferredLocale(locales); |
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81 } |
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82 |
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83 |
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84 /** |
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85 * This method returns the translated value for <i>key</i> or <i>def</i> if |
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86 * <i>key</i> is not existing in the resource bundle. |
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87 * |
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88 * @param meta The CallMeta object of the request that contains the |
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89 * preferred locale. |
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90 * @param key The key that should be translated. |
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91 * @param def A default value that is returned, if <i>key</i> was not found. |
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92 * |
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93 * @return the translated message. |
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94 */ |
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95 public static String getMsg(CallMeta meta, String key, String def) { |
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96 ensureInstance(); |
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97 |
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98 Locale[] locales = INSTANCE.getLocales(); |
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99 Locale locale = meta.getPreferredLocale(locales); |
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100 |
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101 return getMsg(locale, key, def); |
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102 } |
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103 |
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104 public static String getMsg( |
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106 String key, | |
107 Object[] args | |
108 ) { | |
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109 return getMsg(meta, key, key, args); |
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110 } |
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111 |
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112 /** |
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113 * Returns a translated message based on a template specified by <i>key</i> |
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114 * that has necessary values to be filled in. |
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115 * |
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116 * @param meta The CallMeta object. |
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117 * @param key The key of the template in the resource bundle. |
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118 * @param def the default value if no template was found with <i>key</i>. |
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119 * @param args The arguments that are necessary for the template. |
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120 * |
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121 * @return a translated string. |
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122 */ |
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123 public static String getMsg( |
3771 | 124 CallMeta meta, |
125 String key, | |
126 String def, | |
127 Object[] args) | |
413
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128 { |
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129 String template = getMsg(meta, key, (String)null); |
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130 |
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131 if (template == null) { |
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132 return def; |
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133 } |
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134 |
3771 | 135 return format(meta, template, args); |
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136 } |
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137 |
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138 public static String format( |
3771 | 139 CallMeta meta, |
140 String key, | |
141 String def, | |
142 Object ... args | |
143 ) { | |
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144 String template = getMsg(meta, key, (String)null); |
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145 |
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146 if (template == null) { |
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147 template = def; |
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148 } |
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149 |
3771 | 150 return format(meta, template, args); |
151 } | |
152 | |
153 /** | |
154 * Formats the given template using the arguments with respect of the | |
155 * appropriate locale given by the CallMeta instance. | |
156 */ | |
157 public static String format(CallMeta meta, String templ, Object ... args) { | |
158 Locale locale = getLocale(meta); | |
159 MessageFormat mf = new MessageFormat(templ, locale); | |
160 | |
161 return mf.format(args, new StringBuffer(), null).toString(); | |
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162 } |
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163 |
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164 /** |
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165 * This method returns the translated value for <i>key</i> or <i>def</i> if |
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166 * <i>key</i> is not existing in the resource bundle. |
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167 * |
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168 * @param locale The locale. |
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169 * @param key The key that should be translated. |
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170 * @param def A default value that is returned, if <i>key</i> was not found. |
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171 * |
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172 * @return the translated message. |
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173 */ |
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174 public static String getMsg(Locale locale, String key, String def) { |
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175 ResourceBundle bundle = ResourceBundle.getBundle("messages", locale); |
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176 |
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177 try { |
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178 return bundle.getString(key); |
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179 } |
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180 catch (MissingResourceException mre) { |
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181 logger.warn("No message found for key: " + key); |
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182 |
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183 return def; |
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184 } |
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185 } |
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186 } |
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187 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |