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org.apache.commons.net.ftp.FTPClientConfig |
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1 | /* |
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2 | * Copyright 2005 The Apache Software Foundation |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.commons.net.ftp; |
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17 | ||
18 | import java.text.DateFormatSymbols; |
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19 | import java.util.Collection; |
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20 | import java.util.Locale; |
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21 | import java.util.Map; |
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22 | import java.util.StringTokenizer; |
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23 | import java.util.TreeMap; |
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24 | ||
25 | /** |
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26 | * <p> |
|
27 | * This class implements an alternate means of configuring the |
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28 | * {@link org.apache.commons.net.ftp.FTPClient FTPClient} object and |
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29 | * also subordinate objects which it uses. Any class implementing the |
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30 | * {@link org.apache.commons.net.ftp.Configurable Configurable } |
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31 | * interface can be configured by this object. |
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32 | * </p><p> |
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33 | * In particular this class was designed primarily to support configuration |
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34 | * of FTP servers which express file timestamps in formats and languages |
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35 | * other than those for the US locale, which although it is the most common |
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36 | * is not universal. Unfortunately, nothing in the FTP spec allows this to |
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37 | * be determined in an automated way, so manual configuration such as this |
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38 | * is necessary. |
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39 | * </p><p> |
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40 | * This functionality was designed to allow existing clients to work exactly |
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41 | * as before without requiring use of this component. This component should |
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42 | * only need to be explicitly invoked by the user of this package for problem |
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43 | * cases that previous implementations could not solve. |
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44 | * </p> |
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45 | * <h3>Examples of use of FTPClientConfig</h3> |
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46 | * Use cases: |
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47 | * You are trying to access a server that |
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48 | * <ul> |
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49 | * <li>lists files with timestamps that use month names in languages other |
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50 | * than English</li> |
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51 | * <li>lists files with timestamps that use date formats other |
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52 | * than the American English "standard" <code>MM dd yyyy</code></li> |
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53 | * <li>is in different timezone and you need accurate timestamps for |
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54 | * dependency checking as in Ant</li> |
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55 | * </ul> |
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56 | * <p> |
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57 | * Unpaged (whole list) access on a UNIX server that uses French month names |
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58 | * but uses the "standard" <code>MMM d yyyy</code> date formatting |
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59 | * <pre> |
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60 | * FTPClient f=FTPClient(); |
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61 | * FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_UNIX); |
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62 | * conf.setServerLanguageCode("fr"); |
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63 | * f.configure(conf); |
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64 | * f.connect(server); |
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65 | * f.login(username, password); |
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66 | * FTPFile[] files = listFiles(directory); |
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67 | * </pre> |
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68 | * </p> |
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69 | * <p> |
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70 | * Paged access on a UNIX server that uses Danish month names |
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71 | * and "European" date formatting in Denmark's time zone, when you |
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72 | * are in some other time zone. |
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73 | * <pre> |
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74 | * FTPClient f=FTPClient(); |
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75 | * FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_UNIX); |
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76 | * conf.setServerLanguageCode("da"); |
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77 | * conf.setDefaultDateFormat("d MMM yyyy"); |
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78 | * conf.setRecentDateFormat("d MMM HH:mm"); |
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79 | * conf.setTimeZoneId("Europe/Copenhagen"); |
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80 | * f.configure(conf); |
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81 | * f.connect(server); |
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82 | * f.login(username, password); |
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83 | * FTPListParseEngine engine = |
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84 | * f.initiateListParsing("com.whatever.YourOwnParser", directory); |
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85 | * |
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86 | * while (engine.hasNext()) { |
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87 | * FTPFile[] files = engine.getNext(25); // "page size" you want |
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88 | * //do whatever you want with these files, display them, etc. |
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89 | * //expensive FTPFile objects not created until needed. |
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90 | * } |
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91 | * </pre> |
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92 | * </p> |
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93 | * <p> |
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94 | * Unpaged (whole list) access on a VMS server that uses month names |
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95 | * in a language not {@link #getSupportedLanguageCodes() supported} by the system. |
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96 | * but uses the "standard" <code>MMM d yyyy</code> date formatting |
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97 | * <pre> |
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98 | * FTPClient f=FTPClient(); |
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99 | * FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_VMS); |
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100 | * conf.setShortMonthNames( |
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101 | * "jan|feb|mar|apr|ma\u00ED|j\u00FAn|j\u00FAl|\u00e1g\u00FA|sep|okt|n\u00F3v|des"); |
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102 | * f.configure(conf); |
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103 | * f.connect(server); |
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104 | * f.login(username, password); |
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105 | * FTPFile[] files = listFiles(directory); |
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106 | * </pre> |
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107 | * </p> |
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108 | * <p> |
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109 | * Unpaged (whole list) access on a Windows-NT server in a different time zone. |
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110 | * (Note, since the NT Format uses numeric date formatting, language issues |
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111 | * are irrelevant here). |
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112 | * <pre> |
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113 | * FTPClient f=FTPClient(); |
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114 | * FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_NT); |
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115 | * conf.setTimeZoneId("America/Denver"); |
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116 | * f.configure(conf); |
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117 | * f.connect(server); |
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118 | * f.login(username, password); |
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119 | * FTPFile[] files = listFiles(directory); |
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120 | * </pre> |
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121 | * </p> |
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122 | * Unpaged (whole list) access on a Windows-NT server in a different time zone |
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123 | * but which has been configured to use a unix-style listing format. |
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124 | * <pre> |
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125 | * FTPClient f=FTPClient(); |
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126 | * FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_UNIX); |
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127 | * conf.setTimeZoneId("America/Denver"); |
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128 | * f.configure(conf); |
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129 | * f.connect(server); |
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130 | * f.login(username, password); |
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131 | * FTPFile[] files = listFiles(directory); |
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132 | * </pre> |
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133 | * </p> |
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134 | * @since 1.4 |
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135 | * @see org.apache.commons.net.ftp.Configurable |
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136 | * @see org.apache.commons.net.ftp.FTPClient |
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137 | * @see org.apache.commons.net.ftp.parser.FTPTimestampParserImpl#configure(FTPClientConfig) |
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138 | * @see org.apache.commons.net.ftp.parser.ConfigurableFTPFileEntryParserImpl |
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139 | */ |
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140 | public class FTPClientConfig |
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141 | { |
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142 | ||
143 | /** |
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144 | * Identifier by which a unix-based ftp server is known throughout |
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145 | * the commons-net ftp system. |
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146 | */ |
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147 | public static final String SYST_UNIX = "UNIX"; |
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148 | ||
149 | /** |
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150 | * Identifier by which a vms-based ftp server is known throughout |
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151 | * the commons-net ftp system. |
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152 | */ |
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153 | public static final String SYST_VMS = "VMS"; |
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154 | ||
155 | /** |
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156 | * Identifier by which a WindowsNT-based ftp server is known throughout |
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157 | * the commons-net ftp system. |
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158 | */ |
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159 | public static final String SYST_NT = "WINDOWS"; |
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160 | ||
161 | /** |
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162 | * Identifier by which an OS/2-based ftp server is known throughout |
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163 | * the commons-net ftp system. |
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164 | */ |
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165 | public static final String SYST_OS2 = "OS/2"; |
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166 | ||
167 | /** |
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168 | * Identifier by which an OS/400-based ftp server is known throughout |
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169 | * the commons-net ftp system. |
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170 | */ |
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171 | public static final String SYST_OS400 = "OS/400"; |
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172 | ||
173 | /** |
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174 | * Identifier by which an MVS-based ftp server is known throughout |
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175 | * the commons-net ftp system. |
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176 | */ |
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177 | public static final String SYST_MVS = "MVS"; |
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178 | ||
179 | private final String serverSystemKey; |
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180 | 141 | private String defaultDateFormatStr = null; |
181 | 141 | private String recentDateFormatStr = null; |
182 | 141 | private String serverLanguageCode = null; |
183 | 141 | private String shortMonthNames = null; |
184 | 141 | private String serverTimeZoneId = null; |
185 | ||
186 | ||
187 | /** |
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188 | * The main constructor for an FTPClientConfig object |
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189 | * @param systemKey key representing system type of the server being |
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190 | * connected to. See {@link #getServerSystemKey() serverSystemKey} |
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191 | */ |
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192 | 141 | public FTPClientConfig(String systemKey) { |
193 | 141 | this.serverSystemKey = systemKey; |
194 | 141 | } |
195 | ||
196 | /** |
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197 | * Convenience constructor mainly for use in testing. |
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198 | * Constructs a UNIX configuration. |
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199 | */ |
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200 | public FTPClientConfig() { |
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201 | 1 | this(SYST_UNIX); |
202 | 1 | } |
203 | ||
204 | /** |
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205 | * Constructor which allows setting of all member fields |
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206 | * @param systemKey key representing system type of the server being |
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207 | * connected to. See |
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208 | * {@link #getServerSystemKey() serverSystemKey} |
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209 | * @param defaultDateFormatStr See |
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210 | * {@link #setDefaultDateFormatStr(String) defaultDateFormatStr} |
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211 | * @param recentDateFormatStr See |
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212 | * {@link #setRecentDateFormatStr(String) recentDateFormatStr} |
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213 | * @param serverLanguageCode See |
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214 | * {@link #setServerLanguageCode(String) serverLanguageCode} |
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215 | * @param shortMonthNames See |
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216 | * {@link #setShortMonthNames(String) shortMonthNames} |
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217 | * @param serverTimeZoneId See |
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218 | * {@link #setServerTimeZoneId(String) serverTimeZoneId} |
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219 | */ |
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220 | public FTPClientConfig(String systemKey, |
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221 | String defaultDateFormatStr, |
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222 | String recentDateFormatStr, |
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223 | String serverLanguageCode, |
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224 | String shortMonthNames, |
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225 | String serverTimeZoneId) |
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226 | { |
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227 | 136 | this(systemKey); |
228 | 136 | this.defaultDateFormatStr = defaultDateFormatStr; |
229 | 136 | this.recentDateFormatStr = recentDateFormatStr; |
230 | 136 | this.serverLanguageCode = serverLanguageCode; |
231 | 136 | this.shortMonthNames = shortMonthNames; |
232 | 136 | this.serverTimeZoneId = serverTimeZoneId; |
233 | 136 | } |
234 | ||
235 | 9 | private static Map LANGUAGE_CODE_MAP = new TreeMap(); |
236 | static { |
|
237 | ||
238 | // if there are other commonly used month name encodings which |
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239 | // correspond to particular locales, please add them here. |
|
240 | ||
241 | ||
242 | ||
243 | // many locales code short names for months as all three letters |
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244 | // these we handle simply. |
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245 | 9 | LANGUAGE_CODE_MAP.put("en", Locale.ENGLISH); |
246 | 9 | LANGUAGE_CODE_MAP.put("de",Locale.GERMAN); |
247 | 9 | LANGUAGE_CODE_MAP.put("it",Locale.ITALIAN); |
248 | 9 | LANGUAGE_CODE_MAP.put("es", new Locale("es", "", "")); // spanish |
249 | 9 | LANGUAGE_CODE_MAP.put("pt", new Locale("pt", "", "")); // portuguese |
250 | 9 | LANGUAGE_CODE_MAP.put("da", new Locale("da", "", "")); // danish |
251 | 9 | LANGUAGE_CODE_MAP.put("sv", new Locale("sv", "", "")); // swedish |
252 | 9 | LANGUAGE_CODE_MAP.put("no", new Locale("no", "", "")); // norwegian |
253 | 9 | LANGUAGE_CODE_MAP.put("nl", new Locale("nl", "", "")); // dutch |
254 | 9 | LANGUAGE_CODE_MAP.put("ro", new Locale("ro", "", "")); // romanian |
255 | 9 | LANGUAGE_CODE_MAP.put("sq", new Locale("sq", "", "")); // albanian |
256 | 9 | LANGUAGE_CODE_MAP.put("sh", new Locale("sh", "", "")); // serbo-croatian |
257 | 9 | LANGUAGE_CODE_MAP.put("sk", new Locale("sk", "", "")); // slovak |
258 | 9 | LANGUAGE_CODE_MAP.put("sl", new Locale("sl", "", "")); // slovenian |
259 | ||
260 | ||
261 | // some don't |
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262 | 9 | LANGUAGE_CODE_MAP.put("fr", |
263 | "jan|f\u00e9v|mar|avr|mai|jun|jui|ao\u00fb|sep|oct|nov|d\u00e9c"); //french |
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264 | ||
265 | 9 | } |
266 | ||
267 | /** |
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268 | * Getter for the serverSystemKey property. This property |
|
269 | * specifies the general type of server to which the client connects. |
|
270 | * Should be either one of the <code>FTPClientConfig.SYST_*</code> codes |
|
271 | * or else the fully qualified class name of a parser implementing both |
|
272 | * the <code>FTPFileEntryParser</code> and <code>Configurable</code> |
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273 | * interfaces. |
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274 | * @return Returns the serverSystemKey property. |
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275 | */ |
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276 | public String getServerSystemKey() { |
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277 | 2 | return serverSystemKey; |
278 | } |
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279 | ||
280 | /** |
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281 | * getter for the {@link #setDefaultDateFormatStr(String) defaultDateFormatStr} |
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282 | * property. |
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283 | * @return Returns the defaultDateFormatStr property. |
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284 | */ |
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285 | public String getDefaultDateFormatStr() { |
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286 | 137 | return defaultDateFormatStr; |
287 | } |
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288 | ||
289 | /** |
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290 | * getter for the {@link #setRecentDateFormatStr(String) recentDateFormatStr} property. |
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291 | * @return Returns the recentDateFormatStr property. |
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292 | */ |
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293 | ||
294 | public String getRecentDateFormatStr() { |
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295 | 140 | return recentDateFormatStr; |
296 | } |
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297 | ||
298 | /** |
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299 | * getter for the {@link #setServerTimeZoneId(String) serverTimeZoneId} property. |
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300 | * @return Returns the serverTimeZoneId property. |
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301 | */ |
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302 | public String getServerTimeZoneId() { |
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303 | 134 | return serverTimeZoneId; |
304 | } |
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305 | ||
306 | /** |
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307 | * <p> |
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308 | * getter for the {@link #setShortMonthNames(String) shortMonthNames} |
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309 | * property. |
|
310 | * </p> |
|
311 | * @return Returns the shortMonthNames. |
|
312 | */ |
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313 | public String getShortMonthNames() { |
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314 | 134 | return shortMonthNames; |
315 | } |
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316 | ||
317 | /** |
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318 | * <p> |
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319 | * getter for the {@link #setServerLanguageCode(String) serverLanguageCode} property. |
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320 | * </p> |
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321 | * * @return Returns the serverLanguageCode property. |
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322 | */ |
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323 | public String getServerLanguageCode() { |
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324 | 134 | return serverLanguageCode; |
325 | } |
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326 | ||
327 | /** |
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328 | * <p> |
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329 | * setter for the defaultDateFormatStr property. This property |
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330 | * specifies the main date format that will be used by a parser configured |
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331 | * by this configuration to parse file timestamps. If this is not |
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332 | * specified, such a parser will use as a default value, the most commonly |
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333 | * used format which will be in as used in <code>en_US</code> locales. |
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334 | * </p><p> |
|
335 | * This should be in the format described for |
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336 | * <code>java.text.SimpleDateFormat</code>. |
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337 | * property. |
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338 | * </p> |
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339 | * @param defaultDateFormatStr The defaultDateFormatStr to set. |
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340 | */ |
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341 | public void setDefaultDateFormatStr(String defaultDateFormatStr) { |
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342 | 4 | this.defaultDateFormatStr = defaultDateFormatStr; |
343 | 4 | } |
344 | ||
345 | /** |
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346 | * <p> |
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347 | * setter for the recentDateFormatStr property. This property |
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348 | * specifies a secondary date format that will be used by a parser |
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349 | * configured by this configuration to parse file timestamps, typically |
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350 | * those less than a year old. If this is not specified, such a parser |
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351 | * will not attempt to parse using an alternate format. |
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352 | * </p> |
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353 | * This is used primarily in unix-based systems. |
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354 | * </p> |
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355 | * This should be in the format described for |
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356 | * <code>java.text.SimpleDateFormat</code>. |
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357 | * </p> |
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358 | * @param recentDateFormatStr The recentDateFormatStr to set. |
|
359 | */ |
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360 | public void setRecentDateFormatStr(String recentDateFormatStr) { |
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361 | 5 | this.recentDateFormatStr = recentDateFormatStr; |
362 | 5 | } |
363 | ||
364 | /** |
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365 | * <p> |
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366 | * setter for the serverTimeZoneId property. This property |
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367 | * allows a time zone to be specified corresponding to that known to be |
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368 | * used by an FTP server in file listings. This might be particularly |
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369 | * useful to clients such as Ant that try to use these timestamps for |
|
370 | * dependency checking. |
|
371 | * </p><p> |
|
372 | * This should be one of the identifiers used by |
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373 | * <code>java.util.TimeZone</code> to refer to time zones, for example, |
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374 | * <code>America/Chicago</code> or <code>Asia/Rangoon</code>. |
|
375 | * </p> |
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376 | * @param serverTimeZoneId The serverTimeZoneId to set. |
|
377 | */ |
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378 | public void setServerTimeZoneId(String serverTimeZoneId) { |
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379 | 1 | this.serverTimeZoneId = serverTimeZoneId; |
380 | 1 | } |
381 | ||
382 | /** |
|
383 | * <p> |
|
384 | * setter for the shortMonthNames property. |
|
385 | * This property allows the user to specify a set of month names |
|
386 | * used by the server that is different from those that may be |
|
387 | * specified using the {@link #setServerLanguageCode(String) serverLanguageCode} |
|
388 | * property. |
|
389 | * </p><p> |
|
390 | * This should be a string containing twelve strings each composed of |
|
391 | * three characters, delimited by pipe (|) characters. Currently, |
|
392 | * only 8-bit ASCII characters are known to be supported. For example, |
|
393 | * a set of month names used by a hypothetical Icelandic FTP server might |
|
394 | * conceivably be specified as |
|
395 | * <code>"jan|feb|mar|apr|maí|jún|júl|ágú|sep|okt|nóv|des"</code>. |
|
396 | * </p> |
|
397 | * @param shortMonthNames The value to set to the shortMonthNames property. |
|
398 | */ |
|
399 | public void setShortMonthNames(String shortMonthNames) { |
|
400 | 0 | this.shortMonthNames = shortMonthNames; |
401 | 0 | } |
402 | ||
403 | /** |
|
404 | * <p> |
|
405 | * setter for the serverLanguageCode property. This property allows |
|
406 | * user to specify a |
|
407 | * <a href="http://www.ics.uci.edu/pub/ietf/http/related/iso639.txt"> |
|
408 | * two-letter ISO-639 language code</a> that will be used to |
|
409 | * configure the set of month names used by the file timestamp parser. |
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410 | * If neither this nor the {@link #setShortMonthNames(String) shortMonthNames} |
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411 | * is specified, parsing will assume English month names, which may or |
|
412 | * may not be significant, depending on whether the date format(s) |
|
413 | * specified via {@link #setDefaultDateFormatStr(String) defaultDateFormatStr} |
|
414 | * and/or {@link #setRecentDateFormatStr(String) recentDateFormatStr} are using |
|
415 | * numeric or alphabetic month names. |
|
416 | * </p> |
|
417 | * <p>If the code supplied is not supported here, <code>en_US</code> |
|
418 | * month names will be used. We are supporting here those language |
|
419 | * codes which, when a <code> java.util.Locale</code> is constucted |
|
420 | * using it, and a <code>java.text.SimpleDateFormat</code> is |
|
421 | * constructed using that Locale, the array returned by the |
|
422 | * SimpleDateFormat's <code>getShortMonths()</code> method consists |
|
423 | * solely of three 8-bit ASCII character strings. Additionally, |
|
424 | * languages which do not meet this requirement are included if a |
|
425 | * common alternative set of short month names is known to be used. |
|
426 | * This means that users who can tell us of additional such encodings |
|
427 | * may get them added to the list of supported languages by contacting |
|
428 | * the jakarta-commons-net team. |
|
429 | * </p> |
|
430 | * <p><strong> |
|
431 | * Please note that this attribute will NOT be used to determine a |
|
432 | * locale-based date format for the language. </strong> |
|
433 | * Experience has shown that many if not most FTP servers outside the |
|
434 | * United States employ the standard <code>en_US</code> date format |
|
435 | * orderings of <code>MMM d yyyy</code> and <code>MMM d HH:mm</code> |
|
436 | * and attempting to deduce this automatically here would cause more |
|
437 | * problems than it would solve. The date format must be changed |
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438 | * via the {@link #setDefaultDateFormatStr(String) defaultDateFormatStr} and/or |
|
439 | * {@link #setRecentDateFormatStr(String) recentDateFormatStr} parameters. |
|
440 | * </p> |
|
441 | * @param serverLanguageCode The value to set to the serverLanguageCode property. |
|
442 | */ |
|
443 | public void setServerLanguageCode(String serverLanguageCode) { |
|
444 | 1 | this.serverLanguageCode = serverLanguageCode; |
445 | 1 | } |
446 | ||
447 | /** |
|
448 | * Looks up the supplied language code in the internally maintained table of |
|
449 | * language codes. Returns a DateFormatSymbols object configured with |
|
450 | * short month names corresponding to the code. If there is no corresponding |
|
451 | * entry in the table, the object returned will be that for |
|
452 | * <code>Locale.US</code> |
|
453 | * @param languageCode See {@link #setServerLanguageCode(String) serverLanguageCode} |
|
454 | * @return a DateFormatSymbols object configured with short month names |
|
455 | * corresponding to the supplied code, or with month names for |
|
456 | * <code>Locale.US</code> if there is no corresponding entry in the internal |
|
457 | * table. |
|
458 | */ |
|
459 | public static DateFormatSymbols lookupDateFormatSymbols(String languageCode) |
|
460 | { |
|
461 | 136 | Object lang = LANGUAGE_CODE_MAP.get(languageCode); |
462 | 136 | if (lang != null) { |
463 | 134 | if (lang instanceof Locale) { |
464 | 132 | return new DateFormatSymbols((Locale) lang); |
465 | 2 | } else if (lang instanceof String){ |
466 | 2 | return getDateFormatSymbols((String) lang); |
467 | } |
|
468 | } |
|
469 | 2 | return new DateFormatSymbols(Locale.US); |
470 | } |
|
471 | ||
472 | /** |
|
473 | * Returns a DateFormatSymbols object configured with short month names |
|
474 | * as in the supplied string |
|
475 | * @param shortmonths This should be as described in |
|
476 | * {@link #setShortMonthNames(String) shortMonthNames} |
|
477 | * @return a DateFormatSymbols object configured with short month names |
|
478 | * as in the supplied string |
|
479 | */ |
|
480 | public static DateFormatSymbols getDateFormatSymbols(String shortmonths) |
|
481 | { |
|
482 | 6 | String[] months = splitShortMonthString(shortmonths); |
483 | 3 | DateFormatSymbols dfs = new DateFormatSymbols(Locale.US); |
484 | 3 | dfs.setShortMonths(months); |
485 | 3 | return dfs; |
486 | } |
|
487 | ||
488 | private static String[] splitShortMonthString(String shortmonths) { |
|
489 | 6 | StringTokenizer st = new StringTokenizer(shortmonths, "|"); |
490 | 6 | int monthcnt = st.countTokens(); |
491 | 6 | if (12 != monthcnt) { |
492 | 3 | throw new IllegalArgumentException( |
493 | "expecting a pipe-delimited string containing 12 tokens"); |
|
494 | } |
|
495 | 3 | String[] months = new String[13]; |
496 | 3 | int pos = 0; |
497 | 39 | while(st.hasMoreTokens()) { |
498 | 36 | months[pos++] = st.nextToken(); |
499 | } |
|
500 | 3 | months[pos]=""; |
501 | 3 | return months; |
502 | } |
|
503 | ||
504 | /** |
|
505 | * Returns a Collection of all the language codes currently supported |
|
506 | * by this class. See {@link #setServerLanguageCode(String) serverLanguageCode} |
|
507 | * for a functional descrption of language codes within this system. |
|
508 | * |
|
509 | * @return a Collection of all the language codes currently supported |
|
510 | * by this class |
|
511 | */ |
|
512 | public static Collection getSupportedLanguageCodes() { |
|
513 | 0 | return LANGUAGE_CODE_MAP.keySet(); |
514 | } |
|
515 | ||
516 | ||
517 | } |
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