Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
NormalizeSpaceFunction |
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| 3.25;3.25 |
1 | /* | |
2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/NormalizeSpaceFunction.java,v 1.17 2006/02/05 21:47:41 elharo Exp $ | |
3 | * $Revision: 1.17 $ | |
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: NormalizeSpaceFunction.java,v 1.17 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>4.2</b> <code><i>string</i> normalize-space(<i>string</i>)</code> | |
61 | * </p> | |
62 | * | |
63 | * <blockquote src="http://www.w3.org/TR/xpath#function-normalize-space"> | |
64 | * The <b>normalize-space</b> function | |
65 | * returns the argument string with whitespace normalized by stripping | |
66 | * leading and trailing whitespace and replacing sequences of whitespace | |
67 | * characters by a single space. Whitespace characters are the same as | |
68 | * those allowed by the <a href="http://www.w3.org/TR/REC-xml#NT-S" target="_top">S</a> | |
69 | * production in XML. If the argument is omitted, it defaults to the | |
70 | * context node converted to a string, in other words the <a | |
71 | * href="http://www.w3.org/TR/xpath#dt-string-value" | |
72 | * target="_top">string-value</a> of the context node. | |
73 | * </blockquote> | |
74 | * | |
75 | * @author James Strachan (james@metastuff.com) | |
76 | * @see <a href="http://www.w3.org/TR/xpath#function-normalize-space" | |
77 | * target="_top">Section 4.2 of the XPath Specification</a> | |
78 | */ | |
79 | public class NormalizeSpaceFunction implements Function | |
80 | { | |
81 | ||
82 | ||
83 | /** | |
84 | * Create a new <code>NormalizeSpaceFunction</code> object. | |
85 | */ | |
86 | 106 | public NormalizeSpaceFunction() {} |
87 | ||
88 | /** | |
89 | * Returns the string-value of the first item in <code>args</code> | |
90 | * after removing all leading and trailing white space, and | |
91 | * replacing each other sequence of whitespace by a single space. | |
92 | * Whitespace consists of the characters space (0x32), carriage return (0x0D), | |
93 | * linefeed (0x0A), and tab (0x09). | |
94 | * | |
95 | * @param context the context at the point in the | |
96 | * expression when the function is called | |
97 | * @param args a list that contains exactly one item | |
98 | * | |
99 | * @return a normalized <code>String</code> | |
100 | * | |
101 | * @throws FunctionCallException if <code>args</code> does not have length one | |
102 | */ | |
103 | public Object call(Context context, | |
104 | List args) throws FunctionCallException | |
105 | { | |
106 | ||
107 | 56 | if (args.size() == 0) { |
108 | 2 | return evaluate( context.getNodeSet(), |
109 | context.getNavigator() ); | |
110 | } | |
111 | 54 | else if (args.size() == 1) |
112 | { | |
113 | 52 | return evaluate( args.get(0), |
114 | context.getNavigator() ); | |
115 | } | |
116 | ||
117 | 2 | throw new FunctionCallException( "normalize-space() cannot have more than one argument" ); |
118 | } | |
119 | ||
120 | /** | |
121 | * Returns the string-value of <code>strArg</code> after removing | |
122 | * all leading and trailing white space, and | |
123 | * replacing each other sequence of whitespace by a single space. | |
124 | * Whitespace consists of the characters space (0x32), carriage return (0x0D), | |
125 | * linefeed (0x0A), and tab (0x09). | |
126 | * | |
127 | * @param strArg the object whose string-value is normalized | |
128 | * @param nav the context at the point in the | |
129 | * expression when the function is called | |
130 | * | |
131 | * @return the normalized string-value | |
132 | */ | |
133 | public static String evaluate(Object strArg, | |
134 | Navigator nav) | |
135 | { | |
136 | 54 | String str = StringFunction.evaluate( strArg, |
137 | nav ); | |
138 | ||
139 | 54 | char[] buffer = str.toCharArray(); |
140 | 54 | int write = 0; |
141 | 54 | int lastWrite = 0; |
142 | 54 | boolean wroteOne = false; |
143 | 54 | int read = 0; |
144 | 262 | while (read < buffer.length) |
145 | { | |
146 | 208 | if (isXMLSpace(buffer[read])) |
147 | { | |
148 | 100 | if (wroteOne) |
149 | { | |
150 | 58 | buffer[write++] = ' '; |
151 | } | |
152 | do | |
153 | { | |
154 | 244 | read++; |
155 | } | |
156 | 244 | while(read < buffer.length && isXMLSpace(buffer[read])); |
157 | 66 | } |
158 | else | |
159 | { | |
160 | 108 | buffer[write++] = buffer[read++]; |
161 | 108 | wroteOne = true; |
162 | 108 | lastWrite = write; |
163 | } | |
164 | 108 | } |
165 | ||
166 | 54 | return new String(buffer, 0, lastWrite); |
167 | } | |
168 | ||
169 | ||
170 | private static boolean isXMLSpace(char c) { | |
171 | 418 | return c == ' ' || c == '\n' || c == '\r' || c == '\t'; |
172 | } | |
173 | ||
174 | } |