| 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 | } |