Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
NamespaceUriFunction |
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1 | /* | |
2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/NamespaceUriFunction.java,v 1.13 2006/02/05 21:47:41 elharo Exp $ | |
3 | * $Revision: 1.13 $ | |
4 | * $Date: 2006/02/05 21:47:41 $ | |
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: NamespaceUriFunction.java,v 1.13 2006/02/05 21:47:41 elharo Exp $ | |
46 | */ | |
47 | ||
48 | ||
49 | package org.jaxen.function; | |
50 | ||
51 | import java.util.List; | |
52 | ||
53 | import org.jaxen.Context; | |
54 | import org.jaxen.Function; | |
55 | import org.jaxen.FunctionCallException; | |
56 | import org.jaxen.Navigator; | |
57 | ||
58 | /** | |
59 | * <p> | |
60 | * <b>4.1</b> | |
61 | * <code><i>string</i> namespace-uri(<i>node-set?</i>)</code> | |
62 | * </p> | |
63 | * | |
64 | * <blockquote src="http://www.w3.org/TR/xpath"> | |
65 | * <p> | |
66 | * The <b>namespace-uri</b> | |
67 | * function returns the namespace URI of the <a | |
68 | * href="http://www.w3.org/TR/xpath#dt-expanded-name" target="_top">expanded-name</a> of the node in the | |
69 | * argument node-set that is first in <a | |
70 | * href="http://www.w3.org/TR/xpath#dt-document-order" target="_top">document order</a>. If the argument | |
71 | * node-set is empty, the first node has no <a | |
72 | * href="http://www.w3.org/TR/xpath#dt-expanded-name" target="_top">expanded-name</a>, or the namespace URI of | |
73 | * the <a href="http://www.w3.org/TR/xpath#dt-expanded-name" target="_top">expanded-name</a> is null, an empty | |
74 | * string is returned. If the argument is omitted, it defaults to a | |
75 | * node-set with the context node as its only member. | |
76 | * </p> | |
77 | * | |
78 | * <blockquote> <b>NOTE: </b>The string returned by the <b>namespace-uri</b> function will | |
79 | * be empty except for element nodes and attribute nodes.</blockquote> | |
80 | * | |
81 | * </blockquote> | |
82 | * | |
83 | * @author bob mcwhirter (bob @ werken.com) | |
84 | * @see <a href="http://www.w3.org/TR/xpath#function-namespace-uri" | |
85 | * target="_top">Section 4.1 of the XPath Specification</a> | |
86 | */ | |
87 | public class NamespaceUriFunction implements Function | |
88 | { | |
89 | ||
90 | /** | |
91 | * Create a new <code>NamespaceUriFunction</code> object. | |
92 | */ | |
93 | 106 | public NamespaceUriFunction() {} |
94 | ||
95 | /** | |
96 | * Returns the namespace URI of the specified node or the namespace URI of the context node if | |
97 | * no arguments are provided. | |
98 | * | |
99 | * @param context the context at the point in the | |
100 | * expression where the function is called | |
101 | * @param args a <code>List</code> containing zero or one items | |
102 | * | |
103 | * @return a <code>String</code> containing the namespace URI | |
104 | * | |
105 | * @throws FunctionCallException if <code>args</code> has more than one item | |
106 | */ | |
107 | public Object call(Context context, | |
108 | List args) throws FunctionCallException | |
109 | { | |
110 | 92 | if (args.size() == 0) |
111 | { | |
112 | 74 | return evaluate( context.getNodeSet(), |
113 | context.getNavigator() ); | |
114 | } | |
115 | ||
116 | 18 | if ( args.size() == 1 ) |
117 | { | |
118 | 16 | return evaluate( args, |
119 | context.getNavigator() ); | |
120 | } | |
121 | ||
122 | 2 | throw new FunctionCallException( "namespace-uri() requires zero or one argument." ); |
123 | } | |
124 | ||
125 | /** | |
126 | * Returns the namespace URI of <code>list.get(0)</code> | |
127 | * | |
128 | * @param list a list of nodes | |
129 | * @param nav the <code>Navigator</code> used to retrieve the namespace | |
130 | * | |
131 | * @return the namespace URI of <code>list.get(0)</code> | |
132 | * | |
133 | * @throws FunctionCallException if <code>list.get(0)</code> is not a node | |
134 | */ | |
135 | public static String evaluate(List list, | |
136 | Navigator nav) throws FunctionCallException | |
137 | { | |
138 | 104 | if ( ! list.isEmpty() ) |
139 | { | |
140 | 102 | Object first = list.get(0); |
141 | ||
142 | 102 | if ( first instanceof List ) |
143 | { | |
144 | 14 | return evaluate( (List) first, |
145 | nav ); | |
146 | } | |
147 | 88 | else if ( nav.isElement( first ) ) |
148 | { | |
149 | 72 | return nav.getElementNamespaceUri( first ); |
150 | } | |
151 | 16 | else if ( nav.isAttribute( first ) ) |
152 | { | |
153 | 4 | String uri = nav.getAttributeNamespaceUri( first ); |
154 | 4 | if (uri == null) return ""; |
155 | 2 | return uri; |
156 | } | |
157 | 12 | else if ( nav.isProcessingInstruction( first ) ) |
158 | { | |
159 | 2 | return ""; |
160 | } | |
161 | 10 | else if ( nav.isNamespace( first ) ) |
162 | { | |
163 | 2 | return ""; |
164 | } | |
165 | 8 | else if ( nav.isDocument( first ) ) |
166 | { | |
167 | 2 | return ""; |
168 | } | |
169 | 6 | else if ( nav.isComment( first ) ) |
170 | { | |
171 | 2 | return ""; |
172 | } | |
173 | 4 | else if ( nav.isText( first ) ) |
174 | { | |
175 | 2 | return ""; |
176 | } | |
177 | else { | |
178 | 2 | throw new FunctionCallException( |
179 | "The argument to the namespace-uri function must be a node-set"); | |
180 | } | |
181 | ||
182 | } | |
183 | ||
184 | 2 | return ""; |
185 | ||
186 | } | |
187 | } | |
188 |