Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/artifacts/ressource/RessourceFactory.java @ 313:7b4e2f80cba2

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New method in RessourceFactory to read locales supported by the server. Added config file for supported locales. gnv-artifacts/trunk@371 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 26 Nov 2009 08:40:15 +0000
parents 7fb9441dd8af
children e6e172a4915e
rev   line source
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1 /**
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2 *
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3 */
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4 package de.intevation.gnv.artifacts.ressource;
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5
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6 import java.io.BufferedReader;
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7 import java.io.File;
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8 import java.io.FileInputStream;
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9 import java.io.FileNotFoundException;
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10 import java.io.InputStream;
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11 import java.io.InputStreamReader;
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12 import java.io.IOException;
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13 import java.util.ArrayList;
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14 import java.util.Locale;
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15 import java.util.List;
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16 import java.util.MissingResourceException;
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17 import java.util.ResourceBundle;
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18
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19 import org.apache.log4j.Logger;
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20
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21 import de.intevation.artifacts.PreferredLocale;
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22
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23 /**
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24 * @author Tim Englich <tim.englich@intevation.de>
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25 *
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26 */
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27 public class RessourceFactory {
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28
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29 /**
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30 * the logger, used to log exceptions and additonaly information
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31 */
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32 private static Logger log = Logger.getLogger(RessourceFactory.class);
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33
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34 /**
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35 * The singleton Instance of this Factory.
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36 */
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37 private static RessourceFactory instance = null;
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38
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39 private static String RESSOURCE_BASE_ID = "artifact.ressource.dir";
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41 private static String ressourceName = "artifactMessages";
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42 private static String DEFAULT_DIR = "lang";
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43 private static String LANG_CONFIG_FILE = "lang.conf";
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45 private String ressourceDir = null;
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47 private Locale[] locales = null;
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48
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49 /**
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50 * Basic-Constructor of this Class
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51 */
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52 private RessourceFactory() {
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53 super();
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54 ressourceDir = System.getProperty(RESSOURCE_BASE_ID, DEFAULT_DIR);
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55 }
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56
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57 /**
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58 * This Method provides an singleton Instance of this Class.
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59 *
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60 * @return an singleton Instance of this Class
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61 */
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62 public static synchronized RessourceFactory getInstance() {
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63 if (instance == null) {
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64 instance = new RessourceFactory();
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65 }
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66 return instance;
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67 }
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70 /**
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71 * This method reads locales, configured in LANG_CONFIG_FILE, from
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72 * filesystem and returns them as array.
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73 *
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74 * @return Array of locales supported by the the server.
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75 */
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76 public Locale[] getLocales() {
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77
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78 if (locales != null)
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79 return locales;
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80
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81 log.debug("Supported locales have not been read - read now.");
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82 try {
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83 String config = "/" + ressourceDir + "/" + LANG_CONFIG_FILE;
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84 InputStream in = RessourceFactory.class.getResourceAsStream(config);
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85
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86 BufferedReader reader = new BufferedReader(
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87 new InputStreamReader(in)
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88 );
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89
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90 String line = null;
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91 String country = null;
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92 String language = null;
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93 int idx = -1;
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94
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95 List tmpLocales = new ArrayList();
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96
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97 while((line = reader.readLine()) != null) {
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98 // validate if defined locale has a valid length
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99 if (line.length() != 2 && line.length() != 5) {
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100 log.warn("Illegal locale definition found.");
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101 continue;
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102 }
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103
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104 idx = line.indexOf("_");
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105 if (idx > 0) {
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106 // found locale containing language and country code
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107 language = line.substring(0, idx);
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108 country = line.substring(idx+1);
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109 tmpLocales.add(new Locale(language, country));
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110 }
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111 else {
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112 // found locale containing languagey code only
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113 tmpLocales.add(new Locale(line));
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114 }
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115 }
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117 locales = (Locale[]) tmpLocales.toArray(
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118 new Locale[tmpLocales.size()]
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119 );
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120
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121 return locales;
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122 }
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123 catch (FileNotFoundException fnfe) {
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124 log.warn("File not found: " + LANG_CONFIG_FILE, fnfe);
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125 }
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126 catch (IOException ioe) {
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127 log.warn(ioe.getLocalizedMessage(), ioe);
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128 }
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129
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130 return null;
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131 }
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132
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133
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134 /**
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135 * Deliveres the translated Value for an Key to an given Language
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136 *
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137 * @param locale
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138 * The choosen locale
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139 * @param key
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140 * the key
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141 * @param defaultValue
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142 * the Value that should be returned.
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143 * @return the translated Value
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144 */
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145 public String getRessource(PreferredLocale[] preferredLocales, String key,
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146 String defaultValue) {
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147 if (key == null || preferredLocales.length == 0) {
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148 return defaultValue;
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149 }
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150
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151 try {
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152 ResourceBundle rb = ResourceBundle.getBundle(ressourceDir + "/"
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153 + ressourceName,
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154 preferredLocales[0].getLocale());
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155
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156 return rb.getString(key);
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157 } catch (MissingResourceException mre) {
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158 log.warn(mre.getLocalizedMessage());
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159 return defaultValue;
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160 }
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161 }
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162 }
http://dive4elements.wald.intevation.org