Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
LocaleFunctionSupport |
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| 7.0;7 |
1 | /* |
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2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/ext/LocaleFunctionSupport.java,v 1.9 2005/06/28 13:44:45 elharo Exp $ |
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3 | * $Revision: 1.9 $ |
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4 | * $Date: 2005/06/28 13:44:45 $ |
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5 | * |
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6 | * ==================================================================== |
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7 | * |
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8 | * Copyright (C) 2000-2002 bob mcwhirter & James Strachan. |
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9 | * All rights reserved. |
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10 | * |
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11 | * Redistribution and use in source and binary forms, with or without |
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12 | * modification, are permitted provided that the following conditions |
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13 | * are met: |
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14 | * |
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15 | * 1. Redistributions of source code must retain the above copyright |
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16 | * notice, this list of conditions, and the following disclaimer. |
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17 | * |
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18 | * 2. Redistributions in binary form must reproduce the above copyright |
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19 | * notice, this list of conditions, and the disclaimer that follows |
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20 | * these conditions in the documentation and/or other materials |
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21 | * provided with the distribution. |
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22 | * |
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23 | * 3. The name "Jaxen" must not be used to endorse or promote products |
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24 | * derived from this software without prior written permission. For |
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25 | * written permission, please contact license@jaxen.org. |
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26 | * |
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27 | * 4. Products derived from this software may not be called "Jaxen", nor |
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28 | * may "Jaxen" appear in their name, without prior written permission |
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29 | * from the Jaxen Project Management (pm@jaxen.org). |
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30 | * |
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31 | * In addition, we request (but do not require) that you include in the |
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32 | * end-user documentation provided with the redistribution and/or in the |
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33 | * software itself an acknowledgement equivalent to the following: |
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34 | * "This product includes software developed by the |
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35 | * Jaxen Project <http://www.jaxen.org/>." |
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36 | * Alternatively, the acknowledgment may be graphical using the logos |
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37 | * available at http://www.jaxen.org/ |
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38 | * |
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39 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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40 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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41 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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42 | * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT |
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43 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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45 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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46 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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47 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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48 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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49 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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50 | * SUCH DAMAGE. |
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51 | * |
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52 | * ==================================================================== |
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53 | * This software consists of voluntary contributions made by many |
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54 | * individuals on behalf of the Jaxen Project and was originally |
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55 | * created by bob mcwhirter <bob@werken.com> and |
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56 | * James Strachan <jstrachan@apache.org>. For more information on the |
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57 | * Jaxen Project, please see <http://www.jaxen.org/>. |
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58 | * |
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59 | * $Id: LocaleFunctionSupport.java,v 1.9 2005/06/28 13:44:45 elharo Exp $ |
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60 | */ |
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61 | ||
62 | package org.jaxen.function.ext; |
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63 | ||
64 | import java.util.List; |
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65 | import java.util.Locale; |
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66 | import java.util.StringTokenizer; |
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67 | ||
68 | import org.jaxen.Function; |
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69 | import org.jaxen.Navigator; |
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70 | import org.jaxen.function.StringFunction; |
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71 | ||
72 | /** |
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73 | * <p>An abstract base class for Locale-specific extension |
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74 | * functions. This class provides convenience methods that |
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75 | * can be inherited, specifically to find a Locale from |
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76 | * an XPath function argument value. |
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77 | * </p> |
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78 | * |
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79 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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80 | */ |
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81 | 576 | public abstract class LocaleFunctionSupport implements Function |
82 | { |
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83 | ||
84 | /** |
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85 | * Attempts to convert the given function argument value |
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86 | * into a Locale either via casting, extracting it from a List |
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87 | * or looking up the named Locale using reflection. |
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88 | * |
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89 | * @param value is either a Locale, a List containing a Locale |
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90 | * or a String containing the name of a Locale |
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91 | * as defined by the Locale static members. |
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92 | * |
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93 | * @return the Locale for the value or null if one could |
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94 | * not be deduced |
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95 | */ |
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96 | protected Locale getLocale(Object value, Navigator navigator) |
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97 | { |
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98 | 72 | if (value instanceof Locale) |
99 | { |
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100 | 0 | return (Locale) value; |
101 | } |
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102 | 72 | else if(value instanceof List) |
103 | { |
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104 | 0 | List list = (List) value; |
105 | 0 | if ( ! list.isEmpty() ) |
106 | { |
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107 | 0 | return getLocale( list.get(0), navigator ); |
108 | } |
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109 | } |
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110 | else { |
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111 | 72 | String text = StringFunction.evaluate( value, navigator ); |
112 | 72 | if (text != null && text.length() > 0) |
113 | { |
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114 | 72 | return findLocale( text ); |
115 | } |
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116 | } |
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117 | 0 | return null; |
118 | } |
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119 | ||
120 | /** |
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121 | * Tries to find a Locale instance by name using |
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122 | * <a href="http://www.ietf.org/rfc/rfc3066.txt" target="_top">RFC 3066</a> |
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123 | * language tags such as 'en', 'en-US', 'en-US-Brooklyn'. |
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124 | * |
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125 | * @param localeText the RFC 3066 language tag |
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126 | * @return the locale for the given text or null if one could not |
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127 | * be found |
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128 | */ |
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129 | protected Locale findLocale(String localeText) { |
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130 | 72 | StringTokenizer tokens = new StringTokenizer( localeText, "-" ); |
131 | 72 | if (tokens.hasMoreTokens()) |
132 | { |
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133 | 72 | String language = tokens.nextToken(); |
134 | 72 | if (! tokens.hasMoreTokens()) |
135 | { |
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136 | 24 | return findLocaleForLanguage(language); |
137 | } |
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138 | else |
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139 | { |
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140 | 48 | String country = tokens.nextToken(); |
141 | 48 | if (! tokens.hasMoreTokens()) |
142 | { |
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143 | 24 | return new Locale(language, country); |
144 | } |
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145 | else |
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146 | { |
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147 | 24 | String variant = tokens.nextToken(); |
148 | 24 | return new Locale(language, country, variant); |
149 | } |
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150 | } |
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151 | } |
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152 | 0 | return null; |
153 | } |
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154 | ||
155 | /** |
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156 | * Finds the locale with the given language name with no country |
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157 | * or variant, such as Locale.ENGLISH or Locale.FRENCH |
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158 | * |
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159 | * @param language the language code to look for |
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160 | * @return the locale for the given language or null if one could not |
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161 | * be found |
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162 | */ |
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163 | protected Locale findLocaleForLanguage(String language) { |
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164 | 24 | Locale[] locales = Locale.getAvailableLocales(); |
165 | 1992 | for ( int i = 0, size = locales.length; i < size; i++ ) |
166 | { |
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167 | 1992 | Locale locale = locales[i]; |
168 | 1992 | if ( language.equals( locale.getLanguage() ) ) |
169 | { |
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170 | 24 | String country = locale.getCountry(); |
171 | 24 | if ( country == null || country.length() == 0 ) |
172 | { |
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173 | 24 | String variant = locale.getVariant(); |
174 | 24 | if ( variant == null || variant.length() == 0 ) |
175 | { |
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176 | 24 | return locale; |
177 | } |
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178 | } |
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179 | } |
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180 | } |
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181 | 0 | return null; |
182 | } |
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183 | } |