Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
StartsWithFunction |
|
| 2.0;2 |
1 | /* |
|
2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/StartsWithFunction.java,v 1.10 2005/06/28 13:44:45 elharo Exp $ |
|
3 | * $Revision: 1.10 $ |
|
4 | * $Date: 2005/06/28 13:44:45 $ |
|
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: StartsWithFunction.java,v 1.10 2005/06/28 13:44:45 elharo Exp $ |
|
60 | */ |
|
61 | ||
62 | ||
63 | package org.jaxen.function; |
|
64 | ||
65 | import java.util.List; |
|
66 | ||
67 | import org.jaxen.Context; |
|
68 | import org.jaxen.Function; |
|
69 | import org.jaxen.FunctionCallException; |
|
70 | import org.jaxen.Navigator; |
|
71 | ||
72 | /** |
|
73 | * <p><b>4.2</b> <code><i>boolean</i> starts-with(<i>string</i>,<i>string</i>)</code></p> |
|
74 | * |
|
75 | * |
|
76 | * <blockquote src="http://www.w3.org/TR/xpath"> |
|
77 | * The <b>starts-with</b> function returns true if the first argument string starts |
|
78 | * with the second argument string, and otherwise returns false. |
|
79 | * </blockquote> |
|
80 | * |
|
81 | * @author bob mcwhirter (bob @ werken.com) |
|
82 | * @see <a href="http://www.w3.org/TR/xpath#function-starts-with" target="_top">Section 4.2 of the XPath Specification</a> |
|
83 | */ |
|
84 | public class StartsWithFunction implements Function |
|
85 | { |
|
86 | ||
87 | /** |
|
88 | * Create a new <code>StartsWithFunction</code> object. |
|
89 | */ |
|
90 | 294 | public StartsWithFunction() {} |
91 | ||
92 | /** |
|
93 | * Returns true if the string-value of the first item in <code>args</code> |
|
94 | * starts with the string-value of the second item in <code>args</code>. |
|
95 | * Otherwise it returns false. |
|
96 | * |
|
97 | * @param context the context at the point in the |
|
98 | * expression when the function is called |
|
99 | * @param args a list that contains two items |
|
100 | * |
|
101 | * @return <code>Boolean.TRUE</code> if the first item in <code>args</code> |
|
102 | * starts with the string-value of the second item in <code>args</code>; |
|
103 | * otherwise <code>Boolean.FALSE</code> |
|
104 | * |
|
105 | * @throws FunctionCallException if <code>args</code> does not have length two |
|
106 | */ |
|
107 | public Object call(Context context, |
|
108 | List args) throws FunctionCallException |
|
109 | { |
|
110 | 60 | if (args.size() == 2) |
111 | { |
|
112 | 48 | return evaluate( args.get(0), |
113 | args.get(1), |
|
114 | context.getNavigator() ); |
|
115 | } |
|
116 | ||
117 | 12 | throw new FunctionCallException( "starts-with() requires two arguments." ); |
118 | } |
|
119 | ||
120 | /** |
|
121 | * Returns true if the string-value of <code>strArg</code> |
|
122 | * starts with the string-value of <code>matchArg</code>. |
|
123 | * Otherwise it returns false. |
|
124 | * |
|
125 | * @param strArg the object whose string-value searched for the prefix |
|
126 | * @param matchArg the object whose string-value becomes the prefix string to compare against |
|
127 | * @param nav the navigator used to calculate the string-values of the arguments |
|
128 | * |
|
129 | * @return <code>Boolean.TRUE</code> if the string-value of <code>strArg</code> |
|
130 | * starts with the string-value of <code>matchArg</code>; |
|
131 | * otherwise <code>Boolean.FALSE</code> |
|
132 | * |
|
133 | */ |
|
134 | public static Boolean evaluate(Object strArg, |
|
135 | Object matchArg, |
|
136 | Navigator nav) |
|
137 | { |
|
138 | 48 | String str = StringFunction.evaluate( strArg, |
139 | nav ); |
|
140 | ||
141 | 48 | String match = StringFunction.evaluate( matchArg, |
142 | nav ); |
|
143 | ||
144 | 48 | return ( str.startsWith(match) |
145 | ? Boolean.TRUE |
|
146 | : Boolean.FALSE |
|
147 | ); |
|
148 | } |
|
149 | ||
150 | } |