| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
| NamespaceUriFunction |
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| 9.333333333333334;9.333 |
| 1 | /* |
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| 2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/NamespaceUriFunction.java,v 1.12 2005/06/28 13:44:45 elharo Exp $ |
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| 3 | * $Revision: 1.12 $ |
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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: NamespaceUriFunction.java,v 1.12 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>4.1</b> |
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| 75 | * <code><i>string</i> namespace-uri(<i>node-set?</i>)</code> |
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| 76 | * </p> |
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| 77 | * |
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| 78 | * <blockquote src="http://www.w3.org/TR/xpath"> |
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| 79 | * <p> |
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| 80 | * The <b>namespace-uri</b> |
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| 81 | * function returns the namespace URI of the <a |
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| 82 | * href="http://www.w3.org/TR/xpath#dt-expanded-name" target="_top">expanded-name</a> of the node in the |
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| 83 | * argument node-set that is first in <a |
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| 84 | * href="http://www.w3.org/TR/xpath#dt-document-order" target="_top">document order</a>. If the argument |
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| 85 | * node-set is empty, the first node has no <a |
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| 86 | * href="http://www.w3.org/TR/xpath#dt-expanded-name" target="_top">expanded-name</a>, or the namespace URI of |
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| 87 | * the <a href="http://www.w3.org/TR/xpath#dt-expanded-name" target="_top">expanded-name</a> is null, an empty |
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| 88 | * string is returned. If the argument is omitted, it defaults to a |
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| 89 | * node-set with the context node as its only member. |
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| 90 | * </p> |
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| 91 | * |
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| 92 | * <blockquote> <b>NOTE: </b>The string returned by the <b>namespace-uri</b> function will |
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| 93 | * be empty except for element nodes and attribute nodes.</blockquote> |
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| 94 | * |
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| 95 | * </blockquote> |
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| 96 | * |
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| 97 | * @author bob mcwhirter (bob @ werken.com) |
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| 98 | * @see <a href="http://www.w3.org/TR/xpath#function-namespace-uri" |
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| 99 | * target="_top">Section 4.1 of the XPath Specification</a> |
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| 100 | */ |
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| 101 | public class NamespaceUriFunction implements Function |
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| 102 | { |
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| 103 | ||
| 104 | /** |
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| 105 | * Create a new <code>NamespaceUriFunction</code> object. |
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| 106 | */ |
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| 107 | 294 | public NamespaceUriFunction() {} |
| 108 | ||
| 109 | /** |
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| 110 | * Returns the namespace URI of the specified node or the namespace URI of the context node if |
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| 111 | * no arguments are provided. |
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| 112 | * |
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| 113 | * @param context the context at the point in the |
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| 114 | * expression where the function is called |
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| 115 | * @param args a <code>List</code> containing zero or one items |
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| 116 | * |
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| 117 | * @return a <code>String</code> containing the namespace URI |
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| 118 | * |
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| 119 | * @throws FunctionCallException if <code>args</code> has more than one item |
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| 120 | */ |
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| 121 | public Object call(Context context, |
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| 122 | List args) throws FunctionCallException |
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| 123 | { |
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| 124 | 276 | if (args.size() == 0) |
| 125 | { |
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| 126 | 222 | return evaluate( context.getNodeSet(), |
| 127 | context.getNavigator() ); |
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| 128 | } |
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| 129 | ||
| 130 | 54 | if ( args.size() == 1 ) |
| 131 | { |
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| 132 | 48 | return evaluate( args, |
| 133 | context.getNavigator() ); |
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| 134 | } |
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| 135 | ||
| 136 | 6 | throw new FunctionCallException( "namespace-uri() requires zero or one argument." ); |
| 137 | } |
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| 138 | ||
| 139 | /** |
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| 140 | * Returns the namespace URI of <code>list.get(0)</code> |
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| 141 | * |
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| 142 | * @param list a list of nodes |
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| 143 | * @param nav the <code>Navigator</code> used to retrieve the namespace |
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| 144 | * |
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| 145 | * @return the namespace URI of <code>list.get(0)</code> |
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| 146 | * |
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| 147 | * @throws FunctionCallException if <code>list.get(0)</code> is not a node |
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| 148 | */ |
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| 149 | public static String evaluate(List list, |
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| 150 | Navigator nav) throws FunctionCallException |
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| 151 | { |
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| 152 | 312 | if ( ! list.isEmpty() ) |
| 153 | { |
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| 154 | 300 | Object first = list.get(0); |
| 155 | ||
| 156 | 300 | if ( first instanceof List ) |
| 157 | { |
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| 158 | 42 | return evaluate( (List) first, |
| 159 | nav ); |
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| 160 | } |
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| 161 | 258 | else if ( nav.isElement( first ) ) |
| 162 | { |
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| 163 | 216 | return nav.getElementNamespaceUri( first ); |
| 164 | } |
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| 165 | 42 | else if ( nav.isAttribute( first ) ) |
| 166 | { |
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| 167 | 12 | String uri = nav.getAttributeNamespaceUri( first ); |
| 168 | 12 | if (uri == null) return ""; |
| 169 | 6 | return uri; |
| 170 | } |
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| 171 | 30 | else if ( nav.isProcessingInstruction( first ) ) |
| 172 | { |
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| 173 | 6 | return ""; |
| 174 | } |
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| 175 | 24 | else if ( nav.isNamespace( first ) ) |
| 176 | { |
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| 177 | 6 | return ""; |
| 178 | } |
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| 179 | 18 | else if ( nav.isDocument( first ) ) |
| 180 | { |
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| 181 | 6 | return ""; |
| 182 | } |
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| 183 | 12 | else if ( nav.isComment( first ) ) |
| 184 | { |
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| 185 | 0 | return ""; |
| 186 | } |
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| 187 | 12 | else if ( nav.isText( first ) ) |
| 188 | { |
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| 189 | 6 | return ""; |
| 190 | } |
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| 191 | else { |
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| 192 | 6 | throw new FunctionCallException( |
| 193 | "The argument to the namespace-uri function must be a node-set"); |
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| 194 | } |
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| 195 | ||
| 196 | } |
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| 197 | ||
| 198 | 12 | return ""; |
| 199 | ||
| 200 | } |
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| 201 | } |
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| 202 |