Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
NormalizeSpaceFunction |
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| 3.25;3.25 |
1 | /* |
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2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/NormalizeSpaceFunction.java,v 1.16 2005/06/28 13:44:45 elharo Exp $ |
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3 | * $Revision: 1.16 $ |
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4 | * $Date: 2005/06/28 13:44:45 $ |
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5 | * |
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6 | * ==================================================================== |
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7 | * |
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8 | * Copyright (C) 2000-2002 bob mcwhirter & James Strachan. |
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9 | * All rights reserved. |
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10 | * |
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11 | * Redistribution and use in source and binary forms, with or without |
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12 | * modification, are permitted provided that the following conditions |
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13 | * are met: |
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14 | * |
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15 | * 1. Redistributions of source code must retain the above copyright |
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16 | * notice, this list of conditions, and the following disclaimer. |
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17 | * |
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18 | * 2. Redistributions in binary form must reproduce the above copyright |
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19 | * notice, this list of conditions, and the disclaimer that follows |
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20 | * these conditions in the documentation and/or other materials |
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21 | * provided with the distribution. |
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22 | * |
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23 | * 3. The name "Jaxen" must not be used to endorse or promote products |
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24 | * derived from this software without prior written permission. For |
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25 | * written permission, please contact license@jaxen.org. |
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26 | * |
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27 | * 4. Products derived from this software may not be called "Jaxen", nor |
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28 | * may "Jaxen" appear in their name, without prior written permission |
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29 | * from the Jaxen Project Management (pm@jaxen.org). |
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30 | * |
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31 | * In addition, we request (but do not require) that you include in the |
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32 | * end-user documentation provided with the redistribution and/or in the |
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33 | * software itself an acknowledgement equivalent to the following: |
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34 | * "This product includes software developed by the |
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35 | * Jaxen Project <http://www.jaxen.org/>." |
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36 | * Alternatively, the acknowledgment may be graphical using the logos |
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37 | * available at http://www.jaxen.org/ |
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38 | * |
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39 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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40 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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41 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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42 | * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT |
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43 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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45 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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46 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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47 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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48 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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49 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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50 | * SUCH DAMAGE. |
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51 | * |
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52 | * ==================================================================== |
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53 | * This software consists of voluntary contributions made by many |
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54 | * individuals on behalf of the Jaxen Project and was originally |
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55 | * created by bob mcwhirter <bob@werken.com> and |
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56 | * James Strachan <jstrachan@apache.org>. For more information on the |
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57 | * Jaxen Project, please see <http://www.jaxen.org/>. |
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58 | * |
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59 | * $Id: NormalizeSpaceFunction.java,v 1.16 2005/06/28 13:44:45 elharo Exp $ |
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60 | */ |
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61 | ||
62 | ||
63 | package org.jaxen.function; |
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64 | ||
65 | import java.util.List; |
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66 | ||
67 | import org.jaxen.Context; |
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68 | import org.jaxen.Function; |
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69 | import org.jaxen.FunctionCallException; |
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70 | import org.jaxen.Navigator; |
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71 | ||
72 | /** |
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73 | * <p> |
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74 | * <b>4.2</b> <code><i>string</i> normalize-space(<i>string</i>)</code> |
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75 | * </p> |
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76 | * |
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77 | * <blockquote src="http://www.w3.org/TR/xpath#function-normalize-space"> |
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78 | * The <b>normalize-space</b> function |
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79 | * returns the argument string with whitespace normalized by stripping |
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80 | * leading and trailing whitespace and replacing sequences of whitespace |
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81 | * characters by a single space. Whitespace characters are the same as |
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82 | * those allowed by the <a href="http://www.w3.org/TR/REC-xml#NT-S" target="_top">S</a> |
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83 | * production in XML. If the argument is omitted, it defaults to the |
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84 | * context node converted to a string, in other words the <a |
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85 | * href="http://www.w3.org/TR/xpath#dt-string-value" |
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86 | * target="_top">string-value</a> of the context node. |
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87 | * </blockquote> |
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88 | * |
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89 | * @author James Strachan (james@metastuff.com) |
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90 | * @see <a href="http://www.w3.org/TR/xpath#function-normalize-space" |
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91 | * target="_top">Section 4.2 of the XPath Specification</a> |
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92 | */ |
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93 | public class NormalizeSpaceFunction implements Function |
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94 | { |
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95 | ||
96 | ||
97 | /** |
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98 | * Create a new <code>NormalizeSpaceFunction</code> object. |
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99 | */ |
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100 | 294 | public NormalizeSpaceFunction() {} |
101 | ||
102 | /** |
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103 | * Returns the string-value of the first item in <code>args</code> |
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104 | * after removing all leading and trailing white space, and |
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105 | * replacing each other sequence of whitespace by a single space. |
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106 | * Whitespace consists of the characters space (0x32), carriage return (0x0D), |
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107 | * linefeed (0x0A), and tab (0x09). |
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108 | * |
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109 | * @param context the context at the point in the |
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110 | * expression when the function is called |
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111 | * @param args a list that contains exactly one item |
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112 | * |
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113 | * @return a normalized <code>String</code> |
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114 | * |
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115 | * @throws FunctionCallException if <code>args</code> does not have length one |
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116 | */ |
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117 | public Object call(Context context, |
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118 | List args) throws FunctionCallException |
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119 | { |
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120 | ||
121 | 168 | if (args.size() == 0) { |
122 | 6 | return evaluate( context.getNodeSet(), |
123 | context.getNavigator() ); |
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124 | } |
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125 | 162 | else if (args.size() == 1) |
126 | { |
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127 | 156 | return evaluate( args.get(0), |
128 | context.getNavigator() ); |
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129 | } |
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130 | ||
131 | 6 | throw new FunctionCallException( "normalize-space() cannot have more than one argument" ); |
132 | } |
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133 | ||
134 | /** |
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135 | * Returns the string-value of <code>strArg</code> after removing |
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136 | * all leading and trailing white space, and |
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137 | * replacing each other sequence of whitespace by a single space. |
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138 | * Whitespace consists of the characters space (0x32), carriage return (0x0D), |
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139 | * linefeed (0x0A), and tab (0x09). |
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140 | * |
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141 | * @param strArg the object whose string-value is normalized |
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142 | * @param nav the context at the point in the |
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143 | * expression when the function is called |
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144 | * |
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145 | * @return the normalized string-value |
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146 | */ |
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147 | public static String evaluate(Object strArg, |
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148 | Navigator nav) |
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149 | { |
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150 | 162 | String str = StringFunction.evaluate( strArg, |
151 | nav ); |
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152 | ||
153 | 162 | char[] buffer = str.toCharArray(); |
154 | 162 | int write = 0; |
155 | 162 | int lastWrite = 0; |
156 | 162 | boolean wroteOne = false; |
157 | 162 | int read = 0; |
158 | 786 | while (read < buffer.length) |
159 | { |
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160 | 624 | if (isXMLSpace(buffer[read])) |
161 | { |
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162 | 300 | if (wroteOne) |
163 | { |
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164 | 174 | buffer[write++] = ' '; |
165 | } |
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166 | do |
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167 | { |
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168 | 732 | read++; |
169 | } |
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170 | 732 | while(read < buffer.length && isXMLSpace(buffer[read])); |
171 | } |
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172 | else |
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173 | { |
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174 | 324 | buffer[write++] = buffer[read++]; |
175 | 324 | wroteOne = true; |
176 | 324 | lastWrite = write; |
177 | } |
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178 | } |
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179 | ||
180 | 162 | return new String(buffer, 0, lastWrite); |
181 | } |
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182 | ||
183 | ||
184 | private static boolean isXMLSpace(char c) { |
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185 | 1254 | return c == ' ' || c == '\n' || c == '\r' || c == '\t'; |
186 | } |
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187 | ||
188 | } |