Coverage Report - org.jaxen.function.ext.LocaleFunctionSupport
 
Classes in this File Line Coverage Branch Coverage Complexity
LocaleFunctionSupport
76%
25/33
91%
10/11
7
 
 1  
 /*
 2  
  * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/ext/LocaleFunctionSupport.java,v 1.10 2006/02/05 21:47:42 elharo Exp $
 3  
  * $Revision: 1.10 $
 4  
  * $Date: 2006/02/05 21:47:42 $
 5  
  *
 6  
  * ====================================================================
 7  
  *
 8  
  * Copyright 2000-2002 bob mcwhirter & James Strachan.
 9  
  * All rights reserved.
 10  
  *
 11  
  * Redistribution and use in source and binary forms, with or without
 12  
  * modification, are permitted provided that the following conditions are
 13  
  * met:
 14  
  * 
 15  
  *   * Redistributions of source code must retain the above copyright
 16  
  *     notice, this list of conditions and the following disclaimer.
 17  
  * 
 18  
  *   * Redistributions in binary form must reproduce the above copyright
 19  
  *     notice, this list of conditions and the following disclaimer in the
 20  
  *     documentation and/or other materials provided with the distribution.
 21  
  * 
 22  
  *   * Neither the name of the Jaxen Project nor the names of its
 23  
  *     contributors may be used to endorse or promote products derived 
 24  
  *     from this software without specific prior written permission.
 25  
  * 
 26  
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 27  
  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 28  
  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 29  
  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 30  
  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 31  
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 32  
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 33  
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 34  
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 35  
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 36  
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 37  
  *
 38  
  * ====================================================================
 39  
  * This software consists of voluntary contributions made by many 
 40  
  * individuals on behalf of the Jaxen Project and was originally 
 41  
  * created by bob mcwhirter <bob@werken.com> and 
 42  
  * James Strachan <jstrachan@apache.org>.  For more information on the 
 43  
  * Jaxen Project, please see <http://www.jaxen.org/>.
 44  
  * 
 45  
  * $Id: LocaleFunctionSupport.java,v 1.10 2006/02/05 21:47:42 elharo Exp $
 46  
  */
 47  
 
 48  
 package org.jaxen.function.ext;
 49  
 
 50  
 import java.util.List;
 51  
 import java.util.Locale;
 52  
 import java.util.StringTokenizer;
 53  
 
 54  
 import org.jaxen.Function;
 55  
 import org.jaxen.Navigator;
 56  
 import org.jaxen.function.StringFunction;
 57  
 
 58  
 /**
 59  
  * <p>An abstract base class for Locale-specific extension 
 60  
  * functions. This class provides convenience methods that
 61  
  * can be inherited, specifically to find a Locale from
 62  
  * an XPath function argument value.
 63  
  * </p>
 64  
  *
 65  
  * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
 66  
  */
 67  208
 public abstract class LocaleFunctionSupport implements Function
 68  
 {
 69  
 
 70  
     /** 
 71  
      * Attempts to convert the given function argument value 
 72  
      * into a Locale either via casting, extracting it from a List
 73  
      * or looking up the named Locale using reflection.
 74  
      *
 75  
      * @param value is either a Locale, a List containing a Locale
 76  
      *      or a String containing the name of a Locale
 77  
      *      as defined by the Locale static members.
 78  
      *
 79  
      * @return the Locale for the value or null if one could 
 80  
      *      not be deduced
 81  
      */
 82  
     protected Locale getLocale(Object value, Navigator navigator) 
 83  
     {
 84  24
         if (value instanceof Locale)
 85  
         {
 86  0
             return (Locale) value;
 87  
         }
 88  24
         else if(value instanceof List)
 89  
         {
 90  0
             List list = (List) value;
 91  0
             if ( ! list.isEmpty() ) 
 92  
             {
 93  0
                 return getLocale( list.get(0), navigator );
 94  
             }
 95  0
         }
 96  
         else {
 97  24
             String text = StringFunction.evaluate( value, navigator );
 98  24
             if (text != null && text.length() > 0) 
 99  
             {
 100  24
                 return findLocale( text );
 101  
             }
 102  
         }
 103  0
         return null;
 104  
     }
 105  
     
 106  
     /** 
 107  
      * Tries to find a Locale instance by name using 
 108  
      * <a href="http://www.ietf.org/rfc/rfc3066.txt" target="_top">RFC 3066</a>
 109  
      * language tags such as 'en', 'en-US', 'en-US-Brooklyn'.
 110  
      *
 111  
      * @param localeText the RFC 3066 language tag
 112  
      * @return the locale for the given text or null if one could not
 113  
      *      be found 
 114  
      */
 115  
     protected Locale findLocale(String localeText) {
 116  24
         StringTokenizer tokens = new StringTokenizer( localeText, "-" );
 117  24
         if (tokens.hasMoreTokens())
 118  
         {
 119  24
             String language = tokens.nextToken();
 120  24
             if (! tokens.hasMoreTokens())
 121  
             {                
 122  8
                 return findLocaleForLanguage(language);
 123  
             }
 124  
             else 
 125  
             {
 126  16
                 String country = tokens.nextToken();
 127  16
                 if (! tokens.hasMoreTokens())
 128  
                 {
 129  8
                     return new Locale(language, country);
 130  
                 }
 131  
                 else 
 132  
                 {
 133  8
                     String variant = tokens.nextToken();
 134  8
                     return new Locale(language, country, variant);
 135  
                 }
 136  
             }
 137  
         }
 138  0
         return null;
 139  
     }
 140  
     
 141  
     /** 
 142  
      * Finds the locale with the given language name with no country
 143  
      * or variant, such as Locale.ENGLISH or Locale.FRENCH
 144  
      *
 145  
      * @param language the language code to look for
 146  
      * @return the locale for the given language or null if one could not
 147  
      *      be found 
 148  
      */
 149  
     protected Locale findLocaleForLanguage(String language) {
 150  8
         Locale[] locales = Locale.getAvailableLocales();
 151  664
         for ( int i = 0, size = locales.length; i < size; i++ ) 
 152  
         {
 153  664
             Locale locale = locales[i];
 154  664
             if ( language.equals( locale.getLanguage() ) ) 
 155  
             {
 156  8
                 String country = locale.getCountry();
 157  8
                 if ( country == null || country.length() == 0 ) 
 158  
                 {
 159  8
                     String variant = locale.getVariant();
 160  8
                     if ( variant == null || variant.length() == 0 ) 
 161  
                     {
 162  8
                         return locale;
 163  
                     }
 164  
                 }
 165  
             }
 166  
         }    
 167  0
         return null;
 168  
     }
 169  
 }