1 /* 2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultAbsoluteLocationPath.java,v 1.13 2005/03/01 01:49:59 proyal Exp $ 3 * $Revision: 1.13 $ 4 * $Date: 2005/03/01 01:49:59 $ 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: DefaultAbsoluteLocationPath.java,v 1.13 2005/03/01 01:49:59 proyal Exp $ 60 */ 61 package org.jaxen.expr; 62 63 import java.util.Collections; 64 import java.util.List; 65 66 import org.jaxen.Context; 67 import org.jaxen.ContextSupport; 68 import org.jaxen.JaxenException; 69 import org.jaxen.Navigator; 70 import org.jaxen.util.SingletonList; 71 72 public class DefaultAbsoluteLocationPath extends DefaultLocationPath 73 { 74 public DefaultAbsoluteLocationPath() 75 { 76 } 77 78 public String toString() 79 { 80 return "[(DefaultAbsoluteLocationPath): " + super.toString() + "]"; 81 } 82 83 public boolean isAbsolute() 84 { 85 return true; 86 } 87 88 public String getText() 89 { 90 return "/" + super.getText(); 91 } 92 93 public Object evaluate(Context context) throws JaxenException 94 { 95 ContextSupport support = context.getContextSupport(); 96 Navigator nav = support.getNavigator(); 97 Context absContext = new Context( support ); 98 List contextNodes = context.getNodeSet(); 99 100 if ( contextNodes.isEmpty() ) 101 { 102 return Collections.EMPTY_LIST; 103 } 104 105 Object firstNode = contextNodes.get( 0 ); 106 Object docNode = nav.getDocumentNode( firstNode ); 107 108 if ( docNode == null ) 109 { 110 return Collections.EMPTY_LIST; 111 } 112 113 List list = new SingletonList(docNode); 114 115 absContext.setNodeSet( list ); 116 117 return super.evaluate( absContext ); 118 } 119 120 public void accept(Visitor visitor) 121 { 122 visitor.visit(this); 123 } 124 } 125