1 /* 2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/NamespaceUriFunction.java,v 1.5 2005/02/08 01:22:25 elharo Exp $ 3 * $Revision: 1.5 $ 4 * $Date: 2005/02/08 01:22:25 $ 5 * 6 * ==================================================================== 7 * 8 * Copyright (C) 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 13 * are met: 14 * 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer. 17 * 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions, and the disclaimer that follows 20 * these conditions in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * 3. The name "Jaxen" must not be used to endorse or promote products 24 * derived from this software without prior written permission. For 25 * written permission, please contact license@jaxen.org. 26 * 27 * 4. Products derived from this software may not be called "Jaxen", nor 28 * may "Jaxen" appear in their name, without prior written permission 29 * from the Jaxen Project Management (pm@jaxen.org). 30 * 31 * In addition, we request (but do not require) that you include in the 32 * end-user documentation provided with the redistribution and/or in the 33 * software itself an acknowledgement equivalent to the following: 34 * "This product includes software developed by the 35 * Jaxen Project (http://www.jaxen.org/)." 36 * Alternatively, the acknowledgment may be graphical using the logos 37 * available at http://www.jaxen.org/ 38 * 39 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 40 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 41 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 42 * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT 43 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 45 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 46 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 47 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 48 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 49 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * ==================================================================== 53 * This software consists of voluntary contributions made by many 54 * individuals on behalf of the Jaxen Project and was originally 55 * created by bob mcwhirter <bob@werken.com> and 56 * James Strachan <jstrachan@apache.org>. For more information on the 57 * Jaxen Project, please see <http://www.jaxen.org/>. 58 * 59 * $Id: NamespaceUriFunction.java,v 1.5 2005/02/08 01:22:25 elharo Exp $ 60 */ 61 62 63 package org.jaxen.function; 64 65 import java.util.List; 66 67 import org.jaxen.Context; 68 import org.jaxen.Function; 69 import org.jaxen.FunctionCallException; 70 import org.jaxen.Navigator; 71 72 /*** 73 * <p><b>4.1</b> <code><i>string</i> namespace-uri(<i>node-set?</i>)</code> 74 * 75 * @author bob mcwhirter (bob @ werken.com) 76 */ 77 public class NamespaceUriFunction implements Function 78 { 79 80 public Object call(Context context, 81 List args) throws FunctionCallException 82 { 83 if (args.size() == 0) 84 { 85 return evaluate( context.getNodeSet(), 86 context.getNavigator() ); 87 } 88 89 if ( args.size() == 1 ) 90 { 91 return evaluate( args, 92 context.getNavigator() ); 93 } 94 95 throw new FunctionCallException( "namespace-uri() requires zero or one argument." ); 96 } 97 98 public static String evaluate(List list, 99 Navigator nav) throws FunctionCallException 100 { 101 if ( ! list.isEmpty() ) 102 { 103 Object first = list.get(0); 104 105 if ( first instanceof List ) 106 { 107 return evaluate( (List) first, 108 nav ); 109 } 110 else if ( nav.isElement( first ) ) 111 { 112 return nav.getElementNamespaceUri( first ); 113 } 114 else if ( nav.isAttribute( first ) ) 115 { 116 return nav.getAttributeNamespaceUri( first ); 117 } 118 else if ( nav.isProcessingInstruction( first ) ) 119 { 120 return nav.getProcessingInstructionTarget( first ); 121 } 122 else if ( nav.isNamespace( first ) ) 123 { 124 return nav.getNamespaceStringValue( first ); 125 } 126 else if ( nav.isDocument( first ) ) 127 { 128 return ""; 129 } 130 else if ( nav.isComment( first ) ) 131 { 132 return ""; 133 } 134 else if ( nav.isText( first ) ) 135 { 136 return ""; 137 } 138 else { 139 throw new FunctionCallException("The argument to the name function must be a node-set"); 140 } 141 142 } 143 144 return ""; 145 146 } 147 } 148