Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/resources/Resources.java @ 3017:296b067e17e6

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i18n and format for line labels. flys-artifacts/trunk@4582 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Tue, 05 Jun 2012 12:35:49 +0000
parents 6f4a1f513e89
children 79e7bba0f593
rev   line source
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1 package de.intevation.flys.artifacts.resources;
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2
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3 import java.text.MessageFormat;
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4 import java.util.Locale;
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5 import java.util.MissingResourceException;
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6 import java.util.ResourceBundle;
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7
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8 import org.apache.log4j.Logger;
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9
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10 import de.intevation.artifacts.CallMeta;
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11
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12 /**
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13 * This class provides methods for i18n.
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14 *
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15 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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16 */
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17 public class Resources {
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18
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19 /** The logger that is used in this class.*/
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20 private static Logger logger = Logger.getLogger(Resources.class);
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21
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22 /** The singleton instance.*/
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23 private static Resources INSTANCE;
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24
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25 /** The locales supported by this server.*/
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26 protected Locale[] locales;
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27
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28 /**
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29 * No instance of this class is necessary.
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30 */
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31 private Resources() {
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32 }
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33
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34
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35 /**
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36 * Returns the locales supported by this server.
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37 *
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38 * @return the supported locales.
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39 */
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40 public synchronized Locale [] getLocales() {
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41 if (locales == null) {
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42 readLocales();
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43 }
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44
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45 return locales;
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46 }
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47
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48
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49 /**
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50 * Read the locales configured for this server.
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51 */
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52 protected void readLocales() {
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53 // TODO IMPLEMENT ME
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54
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55 locales = new Locale[2];
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56 locales[0] = Locale.GERMANY;
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57 locales[1] = Locale.ENGLISH;
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58 }
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59
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60
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61 private static synchronized void ensureInstance() {
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62 if (INSTANCE == null) {
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63 INSTANCE = new Resources();
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64 }
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65 }
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66
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67
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68 public static Locale getLocale(CallMeta meta) {
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69 ensureInstance();
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70
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71 Locale[] locales = INSTANCE.getLocales();
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72 return meta.getPreferredLocale(locales);
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73 }
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74
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75
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76 /**
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77 * This method returns the translated value for <i>key</i> or <i>def</i> if
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78 * <i>key</i> is not existing in the resource bundle.
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79 *
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80 * @param meta The CallMeta object of the request that contains the
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81 * preferred locale.
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82 * @param key The key that should be translated.
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83 * @param def A default value that is returned, if <i>key</i> was not found.
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84 *
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85 * @return the translated message.
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86 */
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87 public static String getMsg(CallMeta meta, String key, String def) {
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88
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89 ensureInstance();
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90
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91 Locale[] locales = INSTANCE.getLocales();
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92 Locale locale = meta.getPreferredLocale(locales);
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93
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94 return getMsg(locale, key, def);
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95 }
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96
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97 public static String getMsg(
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98 CallMeta meta,
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99 String key,
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100 Object[] args
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101 ) {
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102 return getMsg(meta, key, key, args);
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103 }
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104
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105 /**
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106 * Returns a translated message based on a template specified by <i>key</i>
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107 * that has necessary values to be filled in.
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108 *
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109 * @param meta The CallMeta object.
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110 * @param key The key of the template in the resource bundle.
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111 * @param def the default value if no template was found with <i>key</i>.
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112 * @param args The arguments that are necessary for the template.
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113 *
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114 * @return a translated string.
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115 */
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116 public static String getMsg(
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117 CallMeta meta,
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118 String key,
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119 String def,
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120 Object[] args)
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121 {
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122 String template = getMsg(meta, key, (String)null);
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123
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124 if (template == null) {
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125 return def;
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126 }
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127
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128 return MessageFormat.format(template, args);
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129 }
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130
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131
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132 /**
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133 * This method returns the translated value for <i>key</i> or <i>def</i> if
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134 * <i>key</i> is not existing in the resource bundle.
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135 *
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136 * @param locale The locale.
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137 * @param key The key that should be translated.
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138 * @param def A default value that is returned, if <i>key</i> was not found.
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139 *
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140 * @return the translated message.
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141 */
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142 public static String getMsg(Locale locale, String key, String def) {
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143 ResourceBundle bundle = ResourceBundle.getBundle("messages", locale);
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144
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145 try {
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146 return bundle.getString(key);
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147 }
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148 catch (MissingResourceException mre) {
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149 logger.warn("No message found for key: " + key);
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150
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151 return def;
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152 }
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153 }
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154 }
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155 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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