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Java > Open Source Codes > org > jaxen > function > ext > LowerFunction


1 /*
2  * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/ext/LowerFunction.java,v 1.9 2005/02/08 19:45:50 elharo Exp $
3  * $Revision: 1.9 $
4  * $Date: 2005/02/08 19:45:50 $
5  *
6  * ====================================================================
7  *
8  * Copyright (C) 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
13  * are met:
14  *
15  * 1. Redistributions of source code must retain the above copyright
16  * notice, this list of conditions, and the following disclaimer.
17  *
18  * 2. Redistributions in binary form must reproduce the above copyright
19  * notice, this list of conditions, and the disclaimer that follows
20  * these conditions in the documentation and/or other materials
21  * provided with the distribution.
22  *
23  * 3. The name "Jaxen" must not be used to endorse or promote products
24  * derived from this software without prior written permission. For
25  * written permission, please contact license@jaxen.org.
26  *
27  * 4. Products derived from this software may not be called "Jaxen", nor
28  * may "Jaxen" appear in their name, without prior written permission
29  * from the Jaxen Project Management (pm@jaxen.org).
30  *
31  * In addition, we request (but do not require) that you include in the
32  * end-user documentation provided with the redistribution and/or in the
33  * software itself an acknowledgement equivalent to the following:
34  * "This product includes software developed by the
35  * Jaxen Project (http://www.jaxen.org/)."
36  * Alternatively, the acknowledgment may be graphical using the logos
37  * available at http://www.jaxen.org/
38  *
39  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
40  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
41  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
42  * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
43  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
45  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
46  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
47  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
48  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
49  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50  * SUCH DAMAGE.
51  *
52  * ====================================================================
53  * This software consists of voluntary contributions made by many
54  * individuals on behalf of the Jaxen Project and was originally
55  * created by bob mcwhirter <bob@werken.com> and
56  * James Strachan <jstrachan@apache.org>. For more information on the
57  * Jaxen Project, please see <http://www.jaxen.org/>.
58  *
59  * $Id: LowerFunction.java,v 1.9 2005/02/08 19:45:50 elharo Exp $
60  */
61
62 package org.jaxen.function.ext;
63
64 import java.util.List JavaDoc;
65 import java.util.Locale JavaDoc;
66
67 import org.jaxen.Context;
68 import org.jaxen.FunctionCallException;
69 import org.jaxen.Navigator;
70 import org.jaxen.function.StringFunction;
71
72 /**
73  * <p><code><i>string</i> lower-case(<i>string</i>)</code>
74  *
75  * This function can take a second parameter of the
76  * <code>Locale</code> to use for the String conversion.
77  * </p>
78  *
79  * <p>
80  * For example
81  *
82  * <code>lower-case( /foo/bar )</code>
83  * <code>lower-case( /foo/@name, $myLocale )</code>
84  * </p>
85  *
86  * @author mark wilson (markw@wilsoncom.de)
87  * @author <a HREF="mailto:jstrachan@apache.org">James Strachan</a>
88  */
89 public class LowerFunction extends LocaleFunctionSupport
90 {
91
92     public Object JavaDoc call(Context context,
93                        List JavaDoc args) throws FunctionCallException
94     {
95         Navigator navigator = context.getNavigator();
96         int size = args.size();
97         if (size > 0)
98         {
99             Object JavaDoc text = args.get(0);
100             Locale JavaDoc locale = null;
101             if (size > 1)
102             {
103                 locale = getLocale( args.get(1), navigator );
104             }
105             return evaluate( text, locale, navigator );
106         }
107         throw new FunctionCallException( "lower-case() requires at least one argument." );
108     }
109
110     /**
111      * Converts the given string value to lower case using an optional Locale
112      *
113      * @param strArg the value which gets converted to a String
114      * @param locale the Locale to use for the conversion or null
115      * English should be used
116      * @param nav the Navigator to use
117      */
118     public static String JavaDoc evaluate(Object JavaDoc strArg,
119                                   Locale JavaDoc locale,
120                                   Navigator nav)
121     {
122
123         String JavaDoc str = StringFunction.evaluate( strArg,
124                                                 nav );
125         // it might be possible to use the xml:lang attribute to
126 // pick a default locale
127 if (locale == null) locale = Locale.ENGLISH;
128         return str.toLowerCase(locale);
129         
130     }
131 }
132
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